{
  "units": "m",
  "revision": "4",
  "revisionDefinition": "Dimension-manifest document revision only; each model has its own geometry_revision used by force-result imports.",
  "evidence_type": "teaching_assumption",
  "axes": {
    "x": "longitudinal",
    "y": "transverse",
    "z": "up"
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  "coordinateMappingToThree": "(x,y,z) => (x,z,-y)",
  "sourceStatement": "模型包含原创结构概念变种与注明实桥来源的教学重建；均不构成完整竣工复刻。",
  "lengthDefinition": "length 为桥面中心线两端的 x 向投影长度；曲线桥实际中心线弧长另算，不将两者混同。",
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    "stages": [
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      1,
      2,
      3,
      4
    ],
    "visibilityRule": "stage <= selectedStage && (temporaryUntil absent || selectedStage <= temporaryUntil)",
    "status": "final-geometry installation demonstration, no stage equilibrium analysis"
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  "display": {
    "memberThicknessFactor": 1,
    "deformationFactor": 1,
    "personHeight_m": 1.75,
    "personScale_xyz": [
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      1,
      1
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  },
  "models": [
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      "title": "梁桥 · 受弯基准",
      "geometry_revision": "1",
      "sourceIds": [
        "cTxm8Y17AWLytFL44JkEBq-M01"
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      "bridge": {
        "type": "梁桥",
        "spans": [
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        "total_length": 24,
        "deck_width": 6,
        "girder_depth": 1.2,
        "deck_thickness": 0.18,
        "deck_surface_z": 5,
        "main_span": 24,
        "shape_height": 1.2,
        "shape_height_definition": "桥面以上塔顶高度或梁高",
        "cable_sag": null,
        "cable_lowest_above_deck": null,
        "cable_saddle_above_deck": null,
        "tower_cap_above_saddle": null,
        "anchor_to_anchor_length": null,
        "deck_centerline_arc_length": 24
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      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "girder_reference@1",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 4.6,
          "rightEdge": 0.7,
          "total": 6
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        "walkways": [
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            "id": "walk-main",
            "label": "连续人行净空",
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            "width": 4.5,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
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        "lanes": [],
        "vehicles": []
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      "assets": [
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          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
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        {
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          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
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          "target_height_m": 1.75,
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          "target_height_m": 1.75,
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          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
          "id": "person-5",
          "kind": "person",
          "position_m": [
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            0.27,
            5
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          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
          "id": "person-6",
          "kind": "person",
          "position_m": [
            10.32,
            -0.27,
            5
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        }
      ],
      "geometry_contract": null,
      "analysis": {
        "type": "simply-supported-beam",
        "memberId": "equivalent-main-beam",
        "span": 24,
        "baselineZ": 4.4,
        "section": {
          "topWidth": 6,
          "topThickness": 0.18,
          "bottomWidth": 5.2,
          "bottomThickness": 0.12,
          "webThickness": 0.12,
          "webClearHeight": 0.9,
          "totalDepth": 1.2
        },
        "description": "同种材料全钢、等截面简支箱梁的线弹性教学等效；不含铺装参与、局部板弯曲、畸变、剪切滞或稳定问题。"
      },
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "解析基准梁采用同种材料全钢教学等效截面：顶板6×0.18 m，底板5.2×0.12 m，双腹板0.12×0.90 m；此厚板截面用于演示公式，不是实际桥梁经济设计。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "girder_tree",
      "title": "树形支承梁桥",
      "geometry_revision": "1",
      "sourceIds": [
        "v2-tree-sbp"
      ],
      "bridge": {
        "type": "梁桥",
        "spans": [
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          36,
          18
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        "total_length": 72,
        "deck_width": 6,
        "girder_depth": 1.15,
        "deck_thickness": 0.18,
        "deck_surface_z": 12,
        "main_span": 36,
        "shape_height": 12,
        "shape_height_definition": "桥面至基础顶附近基准面的高度",
        "cable_sag": null,
        "cable_lowest_above_deck": null,
        "cable_saddle_above_deck": null,
        "tower_cap_above_saddle": null,
        "anchor_to_anchor_length": null,
        "deck_centerline_arc_length": 72
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      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "girder_tree@1",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 4.6,
          "rightEdge": 0.7,
          "total": 6
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        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 4.5,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
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        ],
        "lanes": [],
        "vehicles": []
      },
      "assets": [
        {
          "id": "person-0",
          "kind": "person",
          "position_m": [
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            12
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          "target_height_m": 1.75,
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          "kind": "person",
          "position_m": [
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            12
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-2",
          "kind": "person",
          "position_m": [
            -10.32,
            -0.27,
            12
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
          "id": "person-3",
          "kind": "person",
          "position_m": [
            -3.552713678800501e-15,
            0.27,
            12
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-4",
          "kind": "person",
          "position_m": [
            10.32,
            -0.27,
            12
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
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          "kind": "person",
          "position_m": [
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            0.27,
            12
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          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
          "id": "person-6",
          "kind": "person",
          "position_m": [
            30.959999999999994,
            -0.27,
            12
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          "target_height_m": 1.75,
          "uniform_scale": 1
        }
      ],
      "geometry_contract": {
        "type": "tree-supported-girder",
        "branchLevels": 2,
        "treeCount": 2,
        "tipBearingCount": 16,
        "nodes": [
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            "id": "root--1",
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            "level": 0
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            "id": "fork--1--1",
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            "level": 1
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            "id": "tip--1--1--1--1",
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            "level": 2
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            "id": "tip--1--1--1-1",
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            "level": 2
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          {
            "id": "tip--1--1-1--1",
            "point": [
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            "level": 2
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          {
            "id": "tip--1--1-1-1",
            "point": [
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              10.7
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            "level": 2
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            "id": "fork--1-1",
            "point": [
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              8
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            "level": 1
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          {
            "id": "tip--1-1--1--1",
            "point": [
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            "level": 2
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            "level": 2
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            "id": "tip--1-1-1--1",
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            "level": 2
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          {
            "id": "tip--1-1-1-1",
            "point": [
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            "level": 2
          },
          {
            "id": "root-1",
            "point": [
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              4.8
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            "level": 0
          },
          {
            "id": "fork-1--1",
            "point": [
              12,
              0,
              8
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            "level": 1
          },
          {
            "id": "tip-1--1--1--1",
            "point": [
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            "level": 2
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          {
            "id": "tip-1--1--1-1",
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            "level": 2
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          {
            "id": "tip-1--1-1--1",
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            "level": 2
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          {
            "id": "tip-1--1-1-1",
            "point": [
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            "level": 2
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          {
            "id": "fork-1-1",
            "point": [
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            "level": 1
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          {
            "id": "tip-1-1--1--1",
            "point": [
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            "level": 2
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          {
            "id": "tip-1-1--1-1",
            "point": [
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            "level": 2
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          {
            "id": "tip-1-1-1--1",
            "point": [
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            "level": 2
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          {
            "id": "tip-1-1-1-1",
            "point": [
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            "level": 2
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        ],
        "connections": [
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            "point": [
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          {
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            "to": "tree-branch--1--1--1--1",
            "point": [
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          {
            "from": "tree-primary--1--1",
            "to": "tree-branch--1--1--1-1",
            "point": [
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          {
            "from": "tree-primary--1--1",
            "to": "tree-branch--1--1-1--1",
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            "from": "tree-primary--1--1",
            "to": "tree-branch--1--1-1-1",
            "point": [
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          {
            "from": "tree-trunk--1",
            "to": "tree-primary--1-1",
            "point": [
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              4.8
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          },
          {
            "from": "tree-primary--1-1",
            "to": "tree-branch--1-1--1--1",
            "point": [
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              8
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          },
          {
            "from": "tree-primary--1-1",
            "to": "tree-branch--1-1--1-1",
            "point": [
              -12,
              0,
              8
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          },
          {
            "from": "tree-primary--1-1",
            "to": "tree-branch--1-1-1--1",
            "point": [
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              8
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          },
          {
            "from": "tree-primary--1-1",
            "to": "tree-branch--1-1-1-1",
            "point": [
              -12,
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              8
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          },
          {
            "from": "tree-trunk-1",
            "to": "tree-primary-1--1",
            "point": [
              18,
              0,
              4.8
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          },
          {
            "from": "tree-primary-1--1",
            "to": "tree-branch-1--1--1--1",
            "point": [
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              0,
              8
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          },
          {
            "from": "tree-primary-1--1",
            "to": "tree-branch-1--1--1-1",
            "point": [
              12,
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              8
            ]
          },
          {
            "from": "tree-primary-1--1",
            "to": "tree-branch-1--1-1--1",
            "point": [
              12,
              0,
              8
            ]
          },
          {
            "from": "tree-primary-1--1",
            "to": "tree-branch-1--1-1-1",
            "point": [
              12,
              0,
              8
            ]
          },
          {
            "from": "tree-trunk-1",
            "to": "tree-primary-1-1",
            "point": [
              18,
              0,
              4.8
            ]
          },
          {
            "from": "tree-primary-1-1",
            "to": "tree-branch-1-1--1--1",
            "point": [
              24,
              0,
              8
            ]
          },
          {
            "from": "tree-primary-1-1",
            "to": "tree-branch-1-1--1-1",
            "point": [
              24,
              0,
              8
            ]
          },
          {
            "from": "tree-primary-1-1",
            "to": "tree-branch-1-1-1--1",
            "point": [
              24,
              0,
              8
            ]
          },
          {
            "from": "tree-primary-1-1",
            "to": "tree-branch-1-1-1-1",
            "point": [
              24,
              0,
              8
            ]
          }
        ],
        "deckBottomZ": 10.85,
        "spanDefinition": "18+36+18 m 按桥台和树干轴线计；实际梁底支承是另列的16个枝端支座，不等同于三个简支跨。"
      },
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "树形模型为两棵树状桥墩，每棵主干分成两个纵向枝，再分成八个空间枝端；各枝端均通过实体支座接至箱梁底板。",
        "主分叉作为刚接传力节点展示；未据形态自动假定为铰接桁架，也未求节点应力或屈曲承载力。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "stayed_standard",
      "title": "双塔双索面斜拉桥",
      "geometry_revision": "2",
      "sourceIds": [
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        "cTxm8Y17AWLytFL44JkEBq-M100"
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      "bridge": {
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        "spans": [
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          120,
          48
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        "total_length": 216,
        "deck_width": 14,
        "girder_depth": 1.35,
        "deck_thickness": 0.18,
        "deck_surface_z": 8,
        "main_span": 120,
        "shape_height": 32,
        "shape_height_definition": "桥面以上塔顶高度",
        "cable_sag": null,
        "cable_lowest_above_deck": null,
        "cable_saddle_above_deck": null,
        "tower_cap_above_saddle": null,
        "anchor_to_anchor_length": null,
        "deck_centerline_arc_length": 216
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      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "stayed_standard@2",
      "road": {
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          "leftWalk": 1.75,
          "leftSeparator": 0.325,
          "carriageway": 6,
          "rightSeparator": 0.325,
          "rightWalk": 1.75,
          "rightServices": 1.925,
          "total": 14
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        "walkways": [
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            "id": "walk-left",
            "label": "左侧连续人行净空",
            "offset": -4.2,
            "width": 1.75,
            "height": 2.2,
            "surfaceLift": 0.14,
            "evidenceType": "teaching_observation_envelope"
          },
          {
            "id": "walk-right",
            "label": "右侧连续人行净空",
            "offset": 4.2,
            "width": 1.75,
            "height": 2.2,
            "surfaceLift": 0.14,
            "evidenceType": "teaching_observation_envelope"
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        ],
        "lanes": [
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            "offset": -1.5,
            "width": 3,
            "direction": 1
          },
          {
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            "offset": 1.5,
            "width": 3,
            "direction": -1
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        ],
        "vehicles": [
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            "id": "vehicle-0",
            "label": "原创小客车 · 外廓 4.50 × 1.80 × 1.45 m",
            "position": [
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              1.5,
              8.018
            ],
            "heading": 3.141592653589793,
            "direction": -1,
            "laneOffset": 1.5,
            "length": 4.5,
            "width": 1.8,
            "height": 1.45,
            "wheelbase": 2.65,
            "speedMps": 7.5,
            "color": "#cf584a",
            "evidenceType": "teaching_assumption",
            "isLoadCase": false
          },
          {
            "id": "vehicle-1",
            "label": "原创小客车 · 外廓 4.50 × 1.80 × 1.45 m",
            "position": [
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              8.018
            ],
            "heading": 0,
            "direction": 1,
            "laneOffset": -1.5,
            "length": 4.5,
            "width": 1.8,
            "height": 1.45,
            "wheelbase": 2.65,
            "speedMps": 7.5,
            "color": "#3d7891",
            "evidenceType": "teaching_assumption",
            "isLoadCase": false
          },
          {
            "id": "vehicle-2",
            "label": "原创小客车 · 外廓 4.50 × 1.80 × 1.45 m",
            "position": [
              43.2,
              1.5,
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          "stay-1--1-main-5": 7.5,
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          "stay-1-1-side-5": 8
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        "coveredLengthPerPlane": 185,
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      },
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。",
        "本例采用14 m教学车行横断面：双向两条3.00 m车道，两条1.75 m连续人行道，余宽用于分隔护栏、路缘石、路灯与索塔锚固设备带；小客车和防撞护栏仅为外形及尺度示意，不作为计算荷载或碰撞性能设计。"
      ]
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        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "扇形与竖琴形比较共用48+96+48 m分跨、8 m桥宽、桥面以上28 m塔高、双索面及56根斜索；只改变塔端锚点的竖向分布。",
        "扇形索在塔顶3.0 m高锚固区内放射，锚具沿高度间隔0.50 m且左右面分开；这是允许独立锚具的集中扇形教学近似，不将所有索压成一个无尺寸点。",
        "本比较没有由索斜率自动计算全桥索力；平行或扇形外观不构成最优性结论。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
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        "deck_surface_z": 7,
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        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "扇形与竖琴形比较共用48+96+48 m分跨、8 m桥宽、桥面以上28 m塔高、双索面及56根斜索；只改变塔端锚点的竖向分布。",
        "竖琴索按实际塔端偏置后的水平距离配置锚点高度，使每一方向的7根索严格平行；两侧斜索在索塔不同纵向表面锚固。",
        "本比较没有由索斜率自动计算全桥索力；平行或扇形外观不构成最优性结论。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
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        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
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        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "此模型为原创直线斜拉索体系；不是加伦索大街人行桥，不能把该实桥的空间主缆与吊索改称斜拉索。",
        "曲线箱梁的扭转、偏置塔横向弯曲与背索预应力均需空间分析，本模型只展示连接关系。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
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          {
            "hangerId": "side-hanger--1-1-5",
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          {
            "hangerId": "main-hanger--1--40",
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            "hangerId": "main-hanger--1--35",
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            "hangerId": "main-hanger--1--30",
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            "hangerId": "main-hanger--1--20",
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          {
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          {
            "hangerId": "main-hanger--1-20",
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          {
            "hangerId": "main-hanger--1-25",
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            "deckPoint": [
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          {
            "hangerId": "main-hanger--1-30",
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          },
          {
            "hangerId": "main-hanger--1-35",
            "cableId": "main-cable--1",
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          },
          {
            "hangerId": "main-hanger--1-40",
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            "deckPoint": [
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          {
            "hangerId": "side-hanger-1--1-1",
            "cableId": "side-cable-1--1",
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          {
            "hangerId": "side-hanger-1--1-2",
            "cableId": "side-cable-1--1",
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1--1-3",
            "cableId": "side-cable-1--1",
            "point": [
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1--1-4",
            "cableId": "side-cable-1--1",
            "point": [
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1--1-5",
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1-1-1",
            "cableId": "side-cable-1-1",
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            "hangerId": "side-hanger-1-1-2",
            "cableId": "side-cable-1-1",
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          {
            "hangerId": "side-hanger-1-1-3",
            "cableId": "side-cable-1-1",
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            "deckPoint": [
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            "hangerId": "main-hanger-1--40",
            "cableId": "main-cable-1",
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            "hangerId": "main-hanger-1--30",
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        "saddleConnections": [
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            "cableId": "main-cable--1",
            "sideCableId": "side-cable--1--1"
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            "towerId": "tower-1--1",
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            "cableId": "main-cable--1",
            "sideCableId": "side-cable--1-1"
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            "towerId": "tower--1-1",
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            "cableId": "main-cable-1",
            "sideCableId": "side-cable-1--1"
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            "towerId": "tower-1-1",
            "point": [
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            "cableId": "main-cable-1",
            "sideCableId": "side-cable-1-1"
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        ],
        "anchorConnections": [
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            "anchorId": "cable-anchor--1--1",
            "cableId": "side-cable--1--1",
            "point": [
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            ]
          },
          {
            "anchorId": "cable-anchor--1-1",
            "cableId": "side-cable--1-1",
            "point": [
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              2
            ]
          },
          {
            "anchorId": "cable-anchor-1--1",
            "cableId": "side-cable-1--1",
            "point": [
              -90,
              3.05,
              2
            ]
          },
          {
            "anchorId": "cable-anchor-1-1",
            "cableId": "side-cable-1-1",
            "point": [
              90,
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              2
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          }
        ],
        "groundAnchorSetback": 18,
        "overallAnchorLength": 180,
        "bridgeEndCableAboveDeck": 1.660000000000002,
        "heightEvidence": "source-informed-teaching-transfer",
        "referenceSources": [
          {
            "title": "Forth Road Bridge Facts & Figures",
            "url": "https://control.theforthbridges.org/about-the-forth-bridges/forth-road-bridge/forth-road-bridge-facts-figures/",
            "locator": "Vital Statistics: Shortest hanger rope",
            "facts": "最短吊索8 ft=2.4384 m；这是吊索长度，不是主缆距桥面高度。"
          },
          {
            "title": "悬索桥纵向和竖向耦合自振研究",
            "url": "https://pubs.cstam.org.cn/data/article/em/preview/pdf/20120222.pdf",
            "locator": "表1：四渡河大桥算例",
            "facts": "主跨900 m、垂度90 m，垂跨比1/10。"
          }
        ]
      },
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "悬吊区采用公开实桥的短吊索构造量级：福斯公路桥最短吊索8 ft约2.44 m，本教学例主跨跨中吊杆取2.40 m；下吊点在桥面以上0.25 m，所以主缆低点高差为2.65 m。垂跨比取1/10，可对照四渡河桥公开算例。不同跨度的模型不是按比例复刻实桥。",
        "主跨索鞍中心高差=主索垂度9 m+主缆最低点高差2.65 m=11.65 m，塔帽另高0.45 m；主缆低点不等于塔高或垂度。",
        "地锚在桥面端部之外后退18 m，以保留边缆通过桥端时的实体净空；该锚距按本模型几何推定，非所引实桥的锚距。桥面总长144 m，岸端索锚间距180 m。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "suspension_self",
      "title": "自锚式悬索桥",
      "geometry_revision": "2",
      "sourceIds": [
        "2VH4JDmRRUTQVmnQu1hxuu-M15"
      ],
      "bridge": {
        "type": "悬索桥",
        "spans": [
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          84,
          21
        ],
        "total_length": 126,
        "deck_width": 7,
        "girder_depth": 1.55,
        "deck_thickness": 0.18,
        "deck_surface_z": 7,
        "main_span": 84,
        "shape_height": 17.25,
        "shape_height_definition": "桥面以上主跨索鞍中心高差（塔帽另计）",
        "cable_sag": 14,
        "cable_lowest_above_deck": 3.25,
        "cable_saddle_above_deck": 17.25,
        "tower_cap_above_saddle": 0.45,
        "anchor_to_anchor_length": 126,
        "deck_centerline_arc_length": 125.99999999999997
      },
      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "suspension_self@2",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 5.6,
          "rightEdge": 0.7,
          "total": 7
        },
        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 4.7,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
          }
        ],
        "lanes": [],
        "vehicles": []
      },
      "assets": [
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          "id": "person-0",
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          "target_height_m": 1.75,
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          "id": "person-1",
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          "target_height_m": 1.75,
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          "id": "person-2",
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          "target_height_m": 1.75,
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          "id": "person-3",
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          "target_height_m": 1.75,
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        {
          "id": "person-4",
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          "id": "person-5",
          "kind": "person",
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          "target_height_m": 1.75,
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          "id": "person-6",
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          "target_height_m": 1.75,
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          "id": "person-7",
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          "target_height_m": 1.75,
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            "sideCableId": "side-cable--1-1"
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            "cableId": "main-cable-1",
            "sideCableId": "side-cable-1--1"
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            "cableId": "main-cable-1",
            "sideCableId": "side-cable-1-1"
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        ],
        "anchorConnections": [
          {
            "anchorId": "cable-anchor--1--1",
            "cableId": "side-cable--1--1",
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          },
          {
            "anchorId": "cable-anchor--1-1",
            "cableId": "side-cable--1-1",
            "point": [
              63,
              -3.05,
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            ]
          },
          {
            "anchorId": "cable-anchor-1--1",
            "cableId": "side-cable-1--1",
            "point": [
              -63,
              3.05,
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            ]
          },
          {
            "anchorId": "cable-anchor-1-1",
            "cableId": "side-cable-1-1",
            "point": [
              63,
              3.05,
              7.35
            ]
          }
        ],
        "groundAnchorSetback": 0,
        "overallAnchorLength": 126,
        "bridgeEndCableAboveDeck": 0.35,
        "heightEvidence": "source-informed-teaching-transfer",
        "referenceSources": [
          {
            "title": "南浔至临安公路南浔区南浔至练市段工程环境影响报告书",
            "url": "https://zjjcmspublic.oss-cn-hangzhou-zwynet-d01-a.internet.cloud.zj.gov.cn/jcms_files/jcms1/web1756/site/attach/0/3371989344bc46aa8d8c5d6525e50c14.pdf",
            "locator": "PDF第56页 / 印刷46页，日晖桥方案",
            "facts": "48+110+48 m自锚；主缆垂跨比1/6；最短吊索3 m。"
          }
        ]
      },
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "自锚教学例参照日晖桥公开方案的1/6垂跨比与3 m最短吊索量级；本例84 m主跨取垂度14 m，下吊点桥面以上0.25 m，主缆低点以上3.25 m。该移植是教学假设，不是日晖桥复刻，也未将吊索长度直接当作桥面高差。",
        "主跨索鞍中心高差=主索垂度14 m+主缆最低点高差3.25 m=17.25 m，塔帽另高0.45 m；主缆低点不等于塔高或垂度。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "suspension_inclined",
      "title": "倾斜索面悬索桥",
      "geometry_revision": "2",
      "sourceIds": [
        "gimsing-youngjong",
        "v2-suspension-sbp"
      ],
      "bridge": {
        "type": "悬索桥",
        "spans": [
          27,
          90,
          27
        ],
        "total_length": 144,
        "deck_width": 7,
        "girder_depth": 1.15,
        "deck_thickness": 0.18,
        "deck_surface_z": 7,
        "main_span": 90,
        "shape_height": 11.65,
        "shape_height_definition": "桥面以上主跨索鞍中心高差",
        "cable_sag": 9,
        "cable_lowest_above_deck": 2.65,
        "cable_saddle_above_deck": 11.65,
        "tower_cap_above_saddle": 0,
        "anchor_to_anchor_length": 180,
        "deck_centerline_arc_length": 143.99999999999994
      },
      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "suspension_inclined@2",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 5.6,
          "rightEdge": 0.7,
          "total": 7
        },
        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 4.8,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
          }
        ],
        "lanes": [],
        "vehicles": []
      },
      "assets": [
        {
          "id": "person-0",
          "kind": "person",
          "position_m": [
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          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-1",
          "kind": "person",
          "position_m": [
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            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-2",
          "kind": "person",
          "position_m": [
            -39.403636363636366,
            -0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-3",
          "kind": "person",
          "position_m": [
            -28.145454545454548,
            0.27,
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          {
            "hangerId": "inclined-side-hanger-1-1-2",
            "cableId": "inclined-side-cable-1-1",
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            "deckPoint": [
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          },
          {
            "hangerId": "inclined-side-hanger-1-1-3",
            "cableId": "inclined-side-cable-1-1",
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              60,
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            "deckPoint": [
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          {
            "hangerId": "inclined-side-hanger-1-1-4",
            "cableId": "inclined-side-cable-1-1",
            "point": [
              65,
              3.57,
              11.25
            ],
            "deckPoint": [
              65,
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          },
          {
            "hangerId": "inclined-side-hanger-1-1-5",
            "cableId": "inclined-side-cable-1-1",
            "point": [
              70,
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              9.399999999999999
            ],
            "deckPoint": [
              70,
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          }
        ],
        "saddleConnections": [
          {
            "towerId": "inclined-suspension-tower--1--1",
            "point": [
              -45,
              -4.532,
              18.65
            ]
          },
          {
            "towerId": "inclined-suspension-tower--1-1",
            "point": [
              -45,
              4.532,
              18.65
            ]
          },
          {
            "towerId": "inclined-suspension-tower-1--1",
            "point": [
              45,
              -4.532,
              18.65
            ]
          },
          {
            "towerId": "inclined-suspension-tower-1-1",
            "point": [
              45,
              4.532,
              18.65
            ]
          }
        ],
        "heightEvidence": "source-informed-teaching-transfer",
        "referenceSources": [
          {
            "title": "Forth Road Bridge Facts & Figures",
            "url": "https://control.theforthbridges.org/about-the-forth-bridges/forth-road-bridge/forth-road-bridge-facts-figures/",
            "locator": "Vital Statistics: Shortest hanger rope",
            "facts": "最短吊索8 ft=2.4384 m；借用短吊索构造量级，不照搬实桥索面。"
          },
          {
            "title": "悬索桥纵向和竖向耦合自振研究",
            "url": "https://pubs.cstam.org.cn/data/article/em/preview/pdf/20120222.pdf",
            "locator": "表1：四渡河大桥算例",
            "facts": "主跨900 m、主缆垂度90 m。"
          }
        ]
      },
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "最低点的吊点竖向高差取2.40 m，配合桥面以上0.25 m下锚点，主缆低点距桥面2.65 m；参照福斯公路桥约2.44 m最短吊索的构造量级，倾斜吊杆实际长度约2.42 m，非实桥移植尺寸。",
        "保留主跨90 m、垂度9 m（1/10），索鞍高差由9+2.65=11.65 m确定；地锚后退18 m，桥端边缆高于桥面约1.66 m，避免压低塔后边缆穿入桥面。",
        "双索面相对竖直面外倾，y方向偏移/高差=0.13；主缆、索夹和吊杆上端严格落在同一倾斜平面中。该角度和全部尺寸为原创教学选择。",
        "桥面荷载先经斜吊杆进入连续曲线主缆，再经索鞍和地锚传递；不将吊杆直接接到塔顶，因此仍为悬索体系。",
        "主缆采用最终状态抛物线教学近似，未由恒载、预张力和空间平衡求解；两侧横向分力由横梁、主梁及横向体系承担，大小未计算。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "underslung_suspension",
      "title": "下承悬索 · 立杆上托梁",
      "geometry_revision": "1",
      "sourceIds": [
        "v3-underdeck-system"
      ],
      "bridge": {
        "type": "悬索桥",
        "spans": [
          60
        ],
        "total_length": 60,
        "deck_width": 5.5,
        "girder_depth": 0.85,
        "deck_thickness": 0.18,
        "deck_surface_z": 10,
        "main_span": 60,
        "shape_height": 4.2,
        "shape_height_definition": "桥面下主索的端点—跨中垂度",
        "cable_sag": 4.2,
        "cable_lowest_above_deck": null,
        "cable_saddle_above_deck": null,
        "tower_cap_above_saddle": null,
        "anchor_to_anchor_length": null,
        "deck_centerline_arc_length": 60
      },
      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "underslung_suspension@1",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 4.1,
          "rightEdge": 0.7,
          "total": 5.5
        },
        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 3.4,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
          }
        ],
        "lanes": [],
        "vehicles": []
      },
      "assets": [
        {
          "id": "person-0",
          "kind": "person",
          "position_m": [
            -25.8,
            -0.27,
            10
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-1",
          "kind": "person",
          "position_m": [
            -17.200000000000003,
            0.27,
            10
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-2",
          "kind": "person",
          "position_m": [
            -8.600000000000001,
            -0.27,
            10
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-3",
          "kind": "person",
          "position_m": [
            0,
            0.27,
            10
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-4",
          "kind": "person",
          "position_m": [
            8.599999999999998,
            -0.27,
            10
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-5",
          "kind": "person",
          "position_m": [
            17.2,
            0.27,
            10
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-6",
          "kind": "person",
          "position_m": [
            25.8,
            -0.27,
            10
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        }
      ],
      "geometry_contract": {
        "type": "under-deck-suspension-with-compression-struts",
        "cableSag": 4.2,
        "cableEndZ": 8.8,
        "mainCableCount": 2,
        "compressionStrutCount": 38,
        "compressionConnections": [
          {
            "strutId": "underslung-strut--1-1",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -27,
              -2.1,
              8.002
            ],
            "deckPoint": [
              -27,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-2",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -24,
              -2.1,
              7.288
            ],
            "deckPoint": [
              -24,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-3",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -21,
              -2.1,
              6.658000000000001
            ],
            "deckPoint": [
              -21,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-4",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -18,
              -2.1,
              6.112
            ],
            "deckPoint": [
              -18,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-5",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -15,
              -2.1,
              5.65
            ],
            "deckPoint": [
              -15,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-6",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -12,
              -2.1,
              5.272000000000001
            ],
            "deckPoint": [
              -12,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-7",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -9.000000000000002,
              -2.1,
              4.978000000000001
            ],
            "deckPoint": [
              -9.000000000000002,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-8",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -5.999999999999998,
              -2.1,
              4.768000000000001
            ],
            "deckPoint": [
              -5.999999999999998,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-9",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              -2.999999999999999,
              -2.1,
              4.642
            ],
            "deckPoint": [
              -2.999999999999999,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-10",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              0,
              -2.1,
              4.6000000000000005
            ],
            "deckPoint": [
              0,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-11",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              3.0000000000000027,
              -2.1,
              4.642
            ],
            "deckPoint": [
              3.0000000000000027,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-12",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              5.999999999999998,
              -2.1,
              4.768000000000001
            ],
            "deckPoint": [
              5.999999999999998,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-13",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              9.000000000000002,
              -2.1,
              4.978
            ],
            "deckPoint": [
              9.000000000000002,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-14",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              11.999999999999996,
              -2.1,
              5.272
            ],
            "deckPoint": [
              11.999999999999996,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-15",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              15,
              -2.1,
              5.65
            ],
            "deckPoint": [
              15,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-16",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              18.000000000000004,
              -2.1,
              6.112000000000001
            ],
            "deckPoint": [
              18.000000000000004,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-17",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              21,
              -2.1,
              6.658
            ],
            "deckPoint": [
              21,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-18",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              24,
              -2.1,
              7.288000000000001
            ],
            "deckPoint": [
              24,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut--1-19",
            "cableId": "underslung-cable--1",
            "cablePoint": [
              26.999999999999996,
              -2.1,
              8.002
            ],
            "deckPoint": [
              26.999999999999996,
              -2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-1",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -27,
              2.1,
              8.002
            ],
            "deckPoint": [
              -27,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-2",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -24,
              2.1,
              7.288
            ],
            "deckPoint": [
              -24,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-3",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -21,
              2.1,
              6.658000000000001
            ],
            "deckPoint": [
              -21,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-4",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -18,
              2.1,
              6.112
            ],
            "deckPoint": [
              -18,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-5",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -15,
              2.1,
              5.65
            ],
            "deckPoint": [
              -15,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-6",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -12,
              2.1,
              5.272000000000001
            ],
            "deckPoint": [
              -12,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-7",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -9.000000000000002,
              2.1,
              4.978000000000001
            ],
            "deckPoint": [
              -9.000000000000002,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-8",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -5.999999999999998,
              2.1,
              4.768000000000001
            ],
            "deckPoint": [
              -5.999999999999998,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-9",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              -2.999999999999999,
              2.1,
              4.642
            ],
            "deckPoint": [
              -2.999999999999999,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-10",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              0,
              2.1,
              4.6000000000000005
            ],
            "deckPoint": [
              0,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-11",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              3.0000000000000027,
              2.1,
              4.642
            ],
            "deckPoint": [
              3.0000000000000027,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-12",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              5.999999999999998,
              2.1,
              4.768000000000001
            ],
            "deckPoint": [
              5.999999999999998,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-13",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              9.000000000000002,
              2.1,
              4.978
            ],
            "deckPoint": [
              9.000000000000002,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-14",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              11.999999999999996,
              2.1,
              5.272
            ],
            "deckPoint": [
              11.999999999999996,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-15",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              15,
              2.1,
              5.65
            ],
            "deckPoint": [
              15,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-16",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              18.000000000000004,
              2.1,
              6.112000000000001
            ],
            "deckPoint": [
              18.000000000000004,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-17",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              21,
              2.1,
              6.658
            ],
            "deckPoint": [
              21,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-18",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              24,
              2.1,
              7.288000000000001
            ],
            "deckPoint": [
              24,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          },
          {
            "strutId": "underslung-strut-1-19",
            "cableId": "underslung-cable-1",
            "cablePoint": [
              26.999999999999996,
              2.1,
              8.002
            ],
            "deckPoint": [
              26.999999999999996,
              2.1,
              9.15
            ],
            "expectedRole": "compression-not-solved"
          }
        ],
        "anchorageConnections": [
          {
            "anchorId": "underslung-anchor--1-0",
            "cableId": "underslung-cable--1",
            "point": [
              -30,
              -2.1,
              8.8
            ],
            "end": 0
          },
          {
            "anchorId": "underslung-anchor--1-1",
            "cableId": "underslung-cable--1",
            "point": [
              30,
              -2.1,
              8.8
            ],
            "end": 1
          },
          {
            "anchorId": "underslung-anchor-1-0",
            "cableId": "underslung-cable-1",
            "point": [
              -30,
              2.1,
              8.8
            ],
            "end": 0
          },
          {
            "anchorId": "underslung-anchor-1-1",
            "cableId": "underslung-cable-1",
            "point": [
              30,
              2.1,
              8.8
            ],
            "end": 1
          }
        ],
        "anchorSystem": "self-anchored-teaching-assumption",
        "deckBottomZ": 9.15
      },
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "本例是主索下置、撑杆上托桥面的原创教学模型。桥面保持独立平顺主梁；它与桥面直接随受拉带下垂的应力带桥不是同一种几何。",
        "两片下部索在梁端自锚，压杆顶端连接梁底横梁，索端水平分力通过主梁闭合；跨度、垂度、截面及自锚构造均为教学假设。",
        "索与撑杆的拉压名称只表示预期受力角色；尚未计算初始预应力、非线性索形、压杆稳定和整桥内力。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "millennium_low",
      "title": "伦敦千禧桥 · 低位侧索",
      "geometry_revision": "1",
      "sourceIds": [
        "v3-millennium-foster",
        "v3-millennium-arup"
      ],
      "bridge": {
        "type": "悬索桥",
        "spans": [
          81,
          144,
          108
        ],
        "total_length": 333,
        "deck_width": 4,
        "girder_depth": 0.65,
        "deck_thickness": 0.18,
        "deck_surface_z": 12,
        "main_span": 144,
        "shape_height": 2.3,
        "shape_height_definition": "主跨主索最高点—最低点垂度（非塔高）",
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        ],
        "profileStatus": "source spans, width, cable count and 2.3 m main-span sag; elevations, cable spacing, sections and shore connection simplified"
      },
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        "伦敦千禧桥的来源约束教学重建；采用已核主要尺寸及构型，缺少完整竣工图的细节为明确教学假设。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "千禧桥教学重建采用已核实的81+144+108 m跨径、4 m桥面、左右各4根主索及主跨2.3 m垂度。两座Y形支承与约8 m间距钢臂体现其低轮廓悬索特征。",
        "为了清楚显示索与梁的关系，本模型取索鞍高于桥面1.5 m、跨中主索低于桥面0.8 m；该相对高程、索束间距、截面、锚块及梁底细节为教学假设，不能读作竣工尺寸。",
        "两岸锚固采用地锚传力示意。侧索通过横向钢臂与桥面连接，不能把本桥画成高塔加长竖吊杆的普通悬索桥。",
        "本模型不含实际减振器系统和行人横向振动计算，不能以静态外形判断千禧桥的动态舒适性。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "stress_ribbon",
      "title": "应力带人行桥",
      "geometry_revision": "2",
      "sourceIds": [
        "L02",
        "cTxm8Y17AWLytFL44JkEBq-M135"
      ],
      "bridge": {
        "type": "悬索桥",
        "spans": [
          50
        ],
        "total_length": 50,
        "deck_width": 3.4,
        "girder_depth": 0.2,
        "deck_thickness": 0.14,
        "deck_surface_z": 6,
        "main_span": 50,
        "shape_height": 0.9,
        "shape_height_definition": "桥面端部与跨中垂度",
        "cable_sag": 0.9,
        "cable_lowest_above_deck": null,
        "cable_saddle_above_deck": null,
        "tower_cap_above_saddle": null,
        "anchor_to_anchor_length": null,
        "deck_centerline_arc_length": 50.043149234321504
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      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "stress_ribbon@2",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 2,
          "rightEdge": 0.7,
          "total": 3.4
        },
        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 2.2,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
          }
        ],
        "lanes": [],
        "vehicles": []
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      "assets": [
        {
          "id": "person-0",
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          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-1",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-2",
          "kind": "person",
          "position_m": [
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            5.17416
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-3",
          "kind": "person",
          "position_m": [
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            5.1
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-4",
          "kind": "person",
          "position_m": [
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            5.1741600000000005
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-5",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-6",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
        }
      ],
      "geometry_contract": null,
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "本原创应力带示例L=50 m、垂度0.90 m、桥宽3.40 m；不是恩茨奥恩Ⅲ既有教学重建的尺寸复刻。",
        "钢带采用400×50 mm矩形截面、双带间距1.88 m，为本例假设；其线形未按恒载与预应力求解。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "hybrid_cable",
      "title": "斜拉—悬索组合桥",
      "geometry_revision": "2",
      "sourceIds": [
        "cTxm8Y17AWLytFL44JkEBq-M02",
        "gimsing-dischinger"
      ],
      "bridge": {
        "type": "组合桥",
        "spans": [
          42,
          120,
          42
        ],
        "total_length": 204,
        "deck_width": 8,
        "girder_depth": 1.15,
        "deck_thickness": 0.18,
        "deck_surface_z": 7,
        "main_span": 120,
        "shape_height": 14.65,
        "shape_height_definition": "桥面以上主跨索鞍中心高差（塔帽另计）",
        "cable_sag": 12,
        "cable_lowest_above_deck": 2.65,
        "cable_saddle_above_deck": 14.65,
        "tower_cap_above_saddle": 0.45,
        "anchor_to_anchor_length": 248,
        "deck_centerline_arc_length": 204
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      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "hybrid_cable@2",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 6.6,
          "rightEdge": 0.7,
          "total": 8
        },
        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 5.8,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
          }
        ],
        "lanes": [],
        "vehicles": []
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      "assets": [
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          "id": "person-0",
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          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
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          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
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          "id": "person-2",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
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          "id": "person-3",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
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        {
          "id": "person-4",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
          "id": "person-5",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-6",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
          "id": "person-7",
          "kind": "person",
          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
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        {
          "id": "person-8",
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          "position_m": [
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          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-9",
          "kind": "person",
          "position_m": [
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            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-10",
          "kind": "person",
          "position_m": [
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            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-11",
          "kind": "person",
          "position_m": [
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            0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-12",
          "kind": "person",
          "position_m": [
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          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-13",
          "kind": "person",
          "position_m": [
            87.72,
            0.27,
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          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        }
      ],
      "geometry_contract": {
        "type": "hybrid-cable-low-suspension-zone",
        "mainSpan": 120,
        "mainCableSag": 12,
        "lowestCableAboveDeck": 2.65,
        "highestCableAboveDeck": 14.65,
        "saddleZ": 21.65,
        "minimumMainCableZ": 9.649999999999999,
        "measurementScope": "main-span cable only; exclude shore anchor and side spans",
        "deckAnchorZ": 7.25,
        "towerCapAboveSaddle": 0.45,
        "towerTopAboveDeck": 15.1,
        "hangerConnections": [
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            "cableId": "side-cable--1--1",
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            "hangerId": "main-hanger--1--25",
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          {
            "hangerId": "main-hanger--1--20",
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          {
            "hangerId": "main-hanger--1--15",
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            "deckPoint": [
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          {
            "hangerId": "main-hanger--1--10",
            "cableId": "main-cable--1",
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          {
            "hangerId": "main-hanger--1--5",
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          {
            "hangerId": "main-hanger--1-0",
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          {
            "hangerId": "main-hanger--1-5",
            "cableId": "main-cable--1",
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          {
            "hangerId": "main-hanger--1-10",
            "cableId": "main-cable--1",
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            "deckPoint": [
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          },
          {
            "hangerId": "main-hanger--1-15",
            "cableId": "main-cable--1",
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            "deckPoint": [
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          },
          {
            "hangerId": "main-hanger--1-20",
            "cableId": "main-cable--1",
            "point": [
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            ],
            "deckPoint": [
              20,
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            ]
          },
          {
            "hangerId": "main-hanger--1-25",
            "cableId": "main-cable--1",
            "point": [
              25,
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            ],
            "deckPoint": [
              25,
              -3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger--1-30",
            "cableId": "main-cable--1",
            "point": [
              30,
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              12.649999999999999
            ],
            "deckPoint": [
              30,
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              7.25
            ]
          },
          {
            "hangerId": "side-hanger-1--1-1",
            "cableId": "side-cable-1--1",
            "point": [
              -65,
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            "deckPoint": [
              -65,
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            ]
          },
          {
            "hangerId": "side-hanger-1--1-2",
            "cableId": "side-cable-1--1",
            "point": [
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1--1-3",
            "cableId": "side-cable-1--1",
            "point": [
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            "deckPoint": [
              -75,
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          },
          {
            "hangerId": "side-hanger-1--1-4",
            "cableId": "side-cable-1--1",
            "point": [
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            "deckPoint": [
              -80,
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          },
          {
            "hangerId": "side-hanger-1--1-5",
            "cableId": "side-cable-1--1",
            "point": [
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              13.974218749999999
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            "deckPoint": [
              -85,
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          },
          {
            "hangerId": "side-hanger-1--1-6",
            "cableId": "side-cable-1--1",
            "point": [
              -90,
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              12.439062499999999
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            "deckPoint": [
              -90,
              3.55,
              7.25
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          },
          {
            "hangerId": "side-hanger-1--1-7",
            "cableId": "side-cable-1--1",
            "point": [
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1--1-8",
            "cableId": "side-cable-1--1",
            "point": [
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1-1-1",
            "cableId": "side-cable-1-1",
            "point": [
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            "deckPoint": [
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          },
          {
            "hangerId": "side-hanger-1-1-2",
            "cableId": "side-cable-1-1",
            "point": [
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            ],
            "deckPoint": [
              70,
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          },
          {
            "hangerId": "side-hanger-1-1-3",
            "cableId": "side-cable-1-1",
            "point": [
              75,
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              17.04453125
            ],
            "deckPoint": [
              75,
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              7.25
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          },
          {
            "hangerId": "side-hanger-1-1-4",
            "cableId": "side-cable-1-1",
            "point": [
              80,
              3.55,
              15.509374999999999
            ],
            "deckPoint": [
              80,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "side-hanger-1-1-5",
            "cableId": "side-cable-1-1",
            "point": [
              85,
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              13.974218749999999
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            "deckPoint": [
              85,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "side-hanger-1-1-6",
            "cableId": "side-cable-1-1",
            "point": [
              90,
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              12.439062499999999
            ],
            "deckPoint": [
              90,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "side-hanger-1-1-7",
            "cableId": "side-cable-1-1",
            "point": [
              95,
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              10.903906249999999
            ],
            "deckPoint": [
              95,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "side-hanger-1-1-8",
            "cableId": "side-cable-1-1",
            "point": [
              100,
              3.55,
              9.368749999999999
            ],
            "deckPoint": [
              100,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1--30",
            "cableId": "main-cable-1",
            "point": [
              -30,
              3.55,
              12.649999999999999
            ],
            "deckPoint": [
              -30,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1--25",
            "cableId": "main-cable-1",
            "point": [
              -25,
              3.55,
              11.733333333333333
            ],
            "deckPoint": [
              -25,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1--20",
            "cableId": "main-cable-1",
            "point": [
              -20,
              3.55,
              10.983333333333333
            ],
            "deckPoint": [
              -20,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1--15",
            "cableId": "main-cable-1",
            "point": [
              -15,
              3.55,
              10.399999999999999
            ],
            "deckPoint": [
              -15,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1--10",
            "cableId": "main-cable-1",
            "point": [
              -10,
              3.55,
              9.983333333333333
            ],
            "deckPoint": [
              -10,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1--5",
            "cableId": "main-cable-1",
            "point": [
              -5,
              3.55,
              9.73333333333333
            ],
            "deckPoint": [
              -5,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1-0",
            "cableId": "main-cable-1",
            "point": [
              0,
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              9.649999999999999
            ],
            "deckPoint": [
              0,
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              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1-5",
            "cableId": "main-cable-1",
            "point": [
              5,
              3.55,
              9.73333333333333
            ],
            "deckPoint": [
              5,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1-10",
            "cableId": "main-cable-1",
            "point": [
              10,
              3.55,
              9.983333333333333
            ],
            "deckPoint": [
              10,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1-15",
            "cableId": "main-cable-1",
            "point": [
              15,
              3.55,
              10.399999999999999
            ],
            "deckPoint": [
              15,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1-20",
            "cableId": "main-cable-1",
            "point": [
              20,
              3.55,
              10.983333333333333
            ],
            "deckPoint": [
              20,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1-25",
            "cableId": "main-cable-1",
            "point": [
              25,
              3.55,
              11.733333333333333
            ],
            "deckPoint": [
              25,
              3.55,
              7.25
            ]
          },
          {
            "hangerId": "main-hanger-1-30",
            "cableId": "main-cable-1",
            "point": [
              30,
              3.55,
              12.649999999999999
            ],
            "deckPoint": [
              30,
              3.55,
              7.25
            ]
          }
        ],
        "saddleConnections": [
          {
            "towerId": "tower--1--1",
            "point": [
              -60,
              -3.55,
              21.65
            ],
            "cableId": "main-cable--1",
            "sideCableId": "side-cable--1--1"
          },
          {
            "towerId": "tower-1--1",
            "point": [
              60,
              -3.55,
              21.65
            ],
            "cableId": "main-cable--1",
            "sideCableId": "side-cable--1-1"
          },
          {
            "towerId": "tower--1-1",
            "point": [
              -60,
              3.55,
              21.65
            ],
            "cableId": "main-cable-1",
            "sideCableId": "side-cable-1--1"
          },
          {
            "towerId": "tower-1-1",
            "point": [
              60,
              3.55,
              21.65
            ],
            "cableId": "main-cable-1",
            "sideCableId": "side-cable-1-1"
          }
        ],
        "anchorConnections": [
          {
            "anchorId": "cable-anchor--1--1",
            "cableId": "side-cable--1--1",
            "point": [
              -124,
              -3.55,
              2
            ]
          },
          {
            "anchorId": "cable-anchor--1-1",
            "cableId": "side-cable--1-1",
            "point": [
              124,
              -3.55,
              2
            ]
          },
          {
            "anchorId": "cable-anchor-1--1",
            "cableId": "side-cable-1--1",
            "point": [
              -124,
              3.55,
              2
            ]
          },
          {
            "anchorId": "cable-anchor-1-1",
            "cableId": "side-cable-1-1",
            "point": [
              124,
              3.55,
              2
            ]
          }
        ],
        "groundAnchorSetback": 22,
        "overallAnchorLength": 248,
        "bridgeEndCableAboveDeck": 1.754687500000001,
        "heightEvidence": "source-informed-teaching-transfer",
        "referenceSources": [
          {
            "title": "Forth Road Bridge Facts & Figures",
            "url": "https://control.theforthbridges.org/about-the-forth-bridges/forth-road-bridge/forth-road-bridge-facts-figures/",
            "locator": "Vital Statistics: Shortest hanger rope",
            "facts": "最短吊索8 ft=2.4384 m；这是吊索长度，不是主缆距桥面高度。"
          },
          {
            "title": "悬索桥纵向和竖向耦合自振研究",
            "url": "https://pubs.cstam.org.cn/data/article/em/preview/pdf/20120222.pdf",
            "locator": "表1：四渡河大桥算例",
            "facts": "主跨900 m、垂度90 m，垂跨比1/10。"
          }
        ]
      },
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "悬吊区采用公开实桥的短吊索构造量级：福斯公路桥最短吊索8 ft约2.44 m，本教学例主跨跨中吊杆取2.40 m；下吊点在桥面以上0.25 m，所以主缆低点高差为2.65 m。垂跨比取1/10，可对照四渡河桥公开算例。不同跨度的模型不是按比例复刻实桥。",
        "主跨索鞍中心高差=主索垂度12 m+主缆最低点高差2.65 m=14.65 m，塔帽另高0.45 m；主缆低点不等于塔高或垂度。",
        "地锚在桥面端部之外后退22 m，以保留边缆通过桥端时的实体净空；该锚距按本模型几何推定，非所引实桥的锚距。桥面总长204 m，岸端索锚间距248 m。",
        "斜拉区与悬吊区在近塔/跨中交界处衔接；图中不据外观分配两系统的真实刚度、内力或协同份额。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "hybrid_arch",
      "title": "梁—拱组合桥",
      "geometry_revision": "1",
      "sourceIds": [
        "L03",
        "cTxm8Y17AWLytFL44JkEBq-M91"
      ],
      "bridge": {
        "type": "组合桥",
        "spans": [
          80
        ],
        "total_length": 80,
        "deck_width": 7,
        "girder_depth": 1.35,
        "deck_thickness": 0.18,
        "deck_surface_z": 20,
        "main_span": 80,
        "shape_height": 14,
        "shape_height_definition": "拱轴矢高",
        "cable_sag": null,
        "cable_lowest_above_deck": null,
        "cable_saddle_above_deck": null,
        "tower_cap_above_saddle": null,
        "anchor_to_anchor_length": null,
        "deck_centerline_arc_length": 80
      },
      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "hybrid_arch@1",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 5.6,
          "rightEdge": 0.7,
          "total": 7
        },
        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 5.5,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
          }
        ],
        "lanes": [],
        "vehicles": []
      },
      "assets": [
        {
          "id": "person-0",
          "kind": "person",
          "position_m": [
            -34.4,
            -0.27,
            20
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-1",
          "kind": "person",
          "position_m": [
            -22.93333333333333,
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            20
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-2",
          "kind": "person",
          "position_m": [
            -11.466666666666665,
            -0.27,
            20
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-3",
          "kind": "person",
          "position_m": [
            0,
            0.27,
            20
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-4",
          "kind": "person",
          "position_m": [
            11.466666666666669,
            -0.27,
            20
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-5",
          "kind": "person",
          "position_m": [
            22.933333333333337,
            0.27,
            20
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-6",
          "kind": "person",
          "position_m": [
            34.4,
            -0.27,
            20
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        }
      ],
      "geometry_contract": null,
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "此为上承式梁—拱组合的原创对照模型，不是博斯特尔拱托钢带桥；两者来源关系在案例卡中分别标注。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    },
    {
      "id": "fink_inverted",
      "title": "倒置芬克桥",
      "geometry_revision": "1",
      "sourceIds": [
        "v2-fink-lds",
        "v2-fink-istructe",
        "v2-fink-haer"
      ],
      "bridge": {
        "type": "组合桥",
        "spans": [
          72
        ],
        "total_length": 72,
        "deck_width": 6,
        "girder_depth": 1.05,
        "deck_thickness": 0.18,
        "deck_surface_z": 7,
        "main_span": 72,
        "shape_height": 13,
        "shape_height_definition": "桥面以上最高芬克压杆顶部高度",
        "cable_sag": null,
        "cable_lowest_above_deck": null,
        "cable_saddle_above_deck": null,
        "tower_cap_above_saddle": null,
        "anchor_to_anchor_length": null,
        "deck_centerline_arc_length": 72
      },
      "parameters": {},
      "parameter_schema": [],
      "geometry_signature": "fink_inverted@1",
      "road": {
        "type": "pedestrian",
        "transverse_budget": {
          "leftEdge": 0.7,
          "pedestrianSpace": 4.6,
          "rightEdge": 0.7,
          "total": 6
        },
        "walkways": [
          {
            "id": "walk-main",
            "label": "连续人行净空",
            "offset": 0,
            "width": 4.3,
            "height": 2.2,
            "surfaceLift": 0,
            "evidenceType": "teaching_observation_envelope"
          }
        ],
        "lanes": [],
        "vehicles": []
      },
      "assets": [
        {
          "id": "person-0",
          "kind": "person",
          "position_m": [
            -30.96,
            -0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-1",
          "kind": "person",
          "position_m": [
            -20.64,
            0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-2",
          "kind": "person",
          "position_m": [
            -10.32,
            -0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-3",
          "kind": "person",
          "position_m": [
            -3.552713678800501e-15,
            0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-4",
          "kind": "person",
          "position_m": [
            10.32,
            -0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-5",
          "kind": "person",
          "position_m": [
            20.64,
            0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        },
        {
          "id": "person-6",
          "kind": "person",
          "position_m": [
            30.959999999999994,
            -0.27,
            7
          ],
          "target_height_m": 1.75,
          "uniform_scale": 1
        }
      ],
      "geometry_contract": {
        "type": "inverted-fink-rod-cable-teaching-variant",
        "mastCount": 12,
        "mastsPerPlane": 6,
        "continuousTopChord": false,
        "continuousBottomChord": "deck-girder",
        "nodes": [
          {
            "id": "fink-deck--1-mid",
            "point": [
              0,
              -2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck--1--1-0",
            "point": [
              -30,
              -2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck--1--1-1",
            "point": [
              -18,
              -2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck--1--1-2",
            "point": [
              -6,
              -2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-top--1--1-0",
            "point": [
              -30,
              -2.6,
              20
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top--1--1-1",
            "point": [
              -18,
              -2.6,
              15.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top--1--1-2",
            "point": [
              -6,
              -2.6,
              11.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-bowsprit--1--1",
            "point": [
              -43,
              -2.6,
              8.5
            ],
            "kind": "bowsprit"
          },
          {
            "id": "fink-ground--1--1",
            "point": [
              -47,
              -2.6,
              1.4
            ],
            "kind": "ground_anchor"
          },
          {
            "id": "fink-deck--1-1-0",
            "point": [
              30,
              -2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck--1-1-1",
            "point": [
              18,
              -2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck--1-1-2",
            "point": [
              6,
              -2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-top--1-1-0",
            "point": [
              30,
              -2.6,
              20
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top--1-1-1",
            "point": [
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              -2.6,
              15.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top--1-1-2",
            "point": [
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              -2.6,
              11.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-bowsprit--1-1",
            "point": [
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              -2.6,
              8.5
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            "kind": "bowsprit"
          },
          {
            "id": "fink-ground--1-1",
            "point": [
              47,
              -2.6,
              1.4
            ],
            "kind": "ground_anchor"
          },
          {
            "id": "fink-deck-1-mid",
            "point": [
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              2.6,
              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck-1--1-0",
            "point": [
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              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck-1--1-1",
            "point": [
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            "kind": "deck"
          },
          {
            "id": "fink-deck-1--1-2",
            "point": [
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            ],
            "kind": "deck"
          },
          {
            "id": "fink-top-1--1-0",
            "point": [
              -30,
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              20
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top-1--1-1",
            "point": [
              -18,
              2.6,
              15.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top-1--1-2",
            "point": [
              -6,
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              11.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-bowsprit-1--1",
            "point": [
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            ],
            "kind": "bowsprit"
          },
          {
            "id": "fink-ground-1--1",
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            ],
            "kind": "ground_anchor"
          },
          {
            "id": "fink-deck-1-1-0",
            "point": [
              30,
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            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck-1-1-1",
            "point": [
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              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-deck-1-1-2",
            "point": [
              6,
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              7.25
            ],
            "kind": "deck"
          },
          {
            "id": "fink-top-1-1-0",
            "point": [
              30,
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              20
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top-1-1-1",
            "point": [
              18,
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              15.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-top-1-1-2",
            "point": [
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              11.5
            ],
            "kind": "mast_top"
          },
          {
            "id": "fink-bowsprit-1-1",
            "point": [
              43,
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              8.5
            ],
            "kind": "bowsprit"
          },
          {
            "id": "fink-ground-1-1",
            "point": [
              47,
              2.6,
              1.4
            ],
            "kind": "ground_anchor"
          }
        ],
        "rods": [
          {
            "id": "fink-mast--1--1-0",
            "bottom": "fink-deck--1--1-0",
            "top": "fink-top--1--1-0",
            "heightAboveDeck": 13,
            "level": 0,
            "half": -1,
            "plane": -1
          },
          {
            "id": "fink-mast--1--1-1",
            "bottom": "fink-deck--1--1-1",
            "top": "fink-top--1--1-1",
            "heightAboveDeck": 8.5,
            "level": 1,
            "half": -1,
            "plane": -1
          },
          {
            "id": "fink-mast--1--1-2",
            "bottom": "fink-deck--1--1-2",
            "top": "fink-top--1--1-2",
            "heightAboveDeck": 4.5,
            "level": 2,
            "half": -1,
            "plane": -1
          },
          {
            "id": "fink-mast--1-1-0",
            "bottom": "fink-deck--1-1-0",
            "top": "fink-top--1-1-0",
            "heightAboveDeck": 13,
            "level": 0,
            "half": 1,
            "plane": -1
          },
          {
            "id": "fink-mast--1-1-1",
            "bottom": "fink-deck--1-1-1",
            "top": "fink-top--1-1-1",
            "heightAboveDeck": 8.5,
            "level": 1,
            "half": 1,
            "plane": -1
          },
          {
            "id": "fink-mast--1-1-2",
            "bottom": "fink-deck--1-1-2",
            "top": "fink-top--1-1-2",
            "heightAboveDeck": 4.5,
            "level": 2,
            "half": 1,
            "plane": -1
          },
          {
            "id": "fink-mast-1--1-0",
            "bottom": "fink-deck-1--1-0",
            "top": "fink-top-1--1-0",
            "heightAboveDeck": 13,
            "level": 0,
            "half": -1,
            "plane": 1
          },
          {
            "id": "fink-mast-1--1-1",
            "bottom": "fink-deck-1--1-1",
            "top": "fink-top-1--1-1",
            "heightAboveDeck": 8.5,
            "level": 1,
            "half": -1,
            "plane": 1
          },
          {
            "id": "fink-mast-1--1-2",
            "bottom": "fink-deck-1--1-2",
            "top": "fink-top-1--1-2",
            "heightAboveDeck": 4.5,
            "level": 2,
            "half": -1,
            "plane": 1
          },
          {
            "id": "fink-mast-1-1-0",
            "bottom": "fink-deck-1-1-0",
            "top": "fink-top-1-1-0",
            "heightAboveDeck": 13,
            "level": 0,
            "half": 1,
            "plane": 1
          },
          {
            "id": "fink-mast-1-1-1",
            "bottom": "fink-deck-1-1-1",
            "top": "fink-top-1-1-1",
            "heightAboveDeck": 8.5,
            "level": 1,
            "half": 1,
            "plane": 1
          },
          {
            "id": "fink-mast-1-1-2",
            "bottom": "fink-deck-1-1-2",
            "top": "fink-top-1-1-2",
            "heightAboveDeck": 4.5,
            "level": 2,
            "half": 1,
            "plane": 1
          }
        ],
        "cables": [
          {
            "id": "fink-tie--1--1-0-out",
            "from": "fink-bowsprit--1--1",
            "to": "fink-top--1--1-0"
          },
          {
            "id": "fink-tie--1--1-0-in",
            "from": "fink-deck--1--1-1",
            "to": "fink-top--1--1-0"
          },
          {
            "id": "fink-tie--1--1-1-out",
            "from": "fink-deck--1--1-0",
            "to": "fink-top--1--1-1"
          },
          {
            "id": "fink-tie--1--1-1-in",
            "from": "fink-deck--1--1-2",
            "to": "fink-top--1--1-1"
          },
          {
            "id": "fink-tie--1--1-2-out",
            "from": "fink-deck--1--1-1",
            "to": "fink-top--1--1-2"
          },
          {
            "id": "fink-tie--1--1-2-in",
            "from": "fink-deck--1-mid",
            "to": "fink-top--1--1-2"
          },
          {
            "id": "fink-ground-tie--1--1",
            "from": "fink-ground--1--1",
            "to": "fink-bowsprit--1--1"
          },
          {
            "id": "fink-tie--1-1-0-out",
            "from": "fink-bowsprit--1-1",
            "to": "fink-top--1-1-0"
          },
          {
            "id": "fink-tie--1-1-0-in",
            "from": "fink-deck--1-1-1",
            "to": "fink-top--1-1-0"
          },
          {
            "id": "fink-tie--1-1-1-out",
            "from": "fink-deck--1-1-0",
            "to": "fink-top--1-1-1"
          },
          {
            "id": "fink-tie--1-1-1-in",
            "from": "fink-deck--1-1-2",
            "to": "fink-top--1-1-1"
          },
          {
            "id": "fink-tie--1-1-2-out",
            "from": "fink-deck--1-1-1",
            "to": "fink-top--1-1-2"
          },
          {
            "id": "fink-tie--1-1-2-in",
            "from": "fink-deck--1-mid",
            "to": "fink-top--1-1-2"
          },
          {
            "id": "fink-ground-tie--1-1",
            "from": "fink-ground--1-1",
            "to": "fink-bowsprit--1-1"
          },
          {
            "id": "fink-tie-1--1-0-out",
            "from": "fink-bowsprit-1--1",
            "to": "fink-top-1--1-0"
          },
          {
            "id": "fink-tie-1--1-0-in",
            "from": "fink-deck-1--1-1",
            "to": "fink-top-1--1-0"
          },
          {
            "id": "fink-tie-1--1-1-out",
            "from": "fink-deck-1--1-0",
            "to": "fink-top-1--1-1"
          },
          {
            "id": "fink-tie-1--1-1-in",
            "from": "fink-deck-1--1-2",
            "to": "fink-top-1--1-1"
          },
          {
            "id": "fink-tie-1--1-2-out",
            "from": "fink-deck-1--1-1",
            "to": "fink-top-1--1-2"
          },
          {
            "id": "fink-tie-1--1-2-in",
            "from": "fink-deck-1-mid",
            "to": "fink-top-1--1-2"
          },
          {
            "id": "fink-ground-tie-1--1",
            "from": "fink-ground-1--1",
            "to": "fink-bowsprit-1--1"
          },
          {
            "id": "fink-tie-1-1-0-out",
            "from": "fink-bowsprit-1-1",
            "to": "fink-top-1-1-0"
          },
          {
            "id": "fink-tie-1-1-0-in",
            "from": "fink-deck-1-1-1",
            "to": "fink-top-1-1-0"
          },
          {
            "id": "fink-tie-1-1-1-out",
            "from": "fink-deck-1-1-0",
            "to": "fink-top-1-1-1"
          },
          {
            "id": "fink-tie-1-1-1-in",
            "from": "fink-deck-1-1-2",
            "to": "fink-top-1-1-1"
          },
          {
            "id": "fink-tie-1-1-2-out",
            "from": "fink-deck-1-1-1",
            "to": "fink-top-1-1-2"
          },
          {
            "id": "fink-tie-1-1-2-in",
            "from": "fink-deck-1-mid",
            "to": "fink-top-1-1-2"
          },
          {
            "id": "fink-ground-tie-1-1",
            "from": "fink-ground-1-1",
            "to": "fink-bowsprit-1-1"
          }
        ],
        "halfStations": [
          30,
          18,
          6
        ],
        "heightSequenceFromEnds": [
          13,
          8.5,
          4.5
        ],
        "groundAnchored": true
      },
      "analysis": null,
      "assumptions": [
        "原创参数化教学模型；来源用于结构概念比较，不是实桥竣工复刻。",
        "尺寸、截面、锚块、基础、材料外观均为教学假设，未进行承载力、稳定性或风振验算。",
        "施工为最终几何的安装与拆除过程示意；各阶段未求平衡索形、预应力及施工变形。",
        "按模型分别采用人行或车行教学横断面，交通空间仅作几何观察。人物、结构与背景统一米制，不放大人物或索径。",
        "本模型是倒置芬克式杆索梁的原创教学变体：桥面箱梁作连续下弦，两片索面每片6根变高压杆，由两端向跨中逐级降低；没有连续上弦。",
        "取皇家维多利亚码头桥的变高杆、杆索联系与端部伸臂回锚作为概念参照，并参考Forthside对“桥面下弦、无上弦”的体系描述；不复刻其跨度、杆数、横向倾角或构造尺寸。",
        "各杆顶分别连接前后相邻桥面节点；内侧压杆的底部荷载经前一级拉杆递接，端部最高压杆经伸臂与地锚闭合。不是把普通沃伦桁架或中央单一人字架改名芬克桥。",
        "压杆和拉杆名称表示本教学体系的预期工作角色；真实内力、预张力、非对称荷载及稳定性尚未求解，不能凭颜色或杆件粗细判定应力。",
        "人物为原创圆润动漫风尺度参照，脚底至最高发顶严格 1.75 m，不单独放大。",
        "连续通行包络用于观察结构侵入，宽度与净高为本教学布置假设；不是规范符合性、无障碍或交通安全验收。"
      ]
    }
  ]
}