{
  "schema": "bridge-case-evidence/1",
  "case": "C11 虎门大桥涡振",
  "checked_on": "2026-09-23",
  "identity": "2020涡振与恢复运营，不是坍塌事故；单跨地锚式悬索桥、流线型钢箱梁",
  "dimension_contract": "dimension-contract.json",
  "sources": "sources.json",
  "source_levels": {
    "A": "主管部门/政府发布",
    "B": "新闻原报道与采访",
    "P": "论文作者或期刊原文"
  },
  "source_caveats": [
    "A2直达404，官方搜索索引与B1/B2交叉核对",
    "P1直达403；垂跨比来自出版商索引段落",
    "P2/P3原PDF已读相关页，非完整竣工图",
    "未完整播放原视频，不把HTTP200当播放成功",
    "初发时刻有14时许/15时左右等口径，正文写5月5日下午",
    "未核到明确伤亡数字一手声明，不自行填零"
  ],
  "assets": [
    {
      "file": "media/cctv-20200506-cover.jpg",
      "original_url": "https://p1.img.cctvpic.com/fmspic/2020/05/06/3412d4acbc984b00a0e1bc0da7575677-77.jpg",
      "source_id": "B3",
      "identity": "原节目封面，非连续事故片段",
      "bytes": 50889,
      "sha256": "c1ed876849974cc4d5a5798ed74a43180c92a18032c178bf93cdc8feb3992ea4"
    },
    {
      "file": "media/cctv-20200515-reopening.jpeg",
      "original_url": "https://p1.img.cctvpic.com/cportal/cnews-yz/img/2020/05/15/1589542193043_74_1080x608.jpeg",
      "source_id": "B2",
      "identity": "央视原页所标东莞广播电视台事件回顾图",
      "bytes": 103875,
      "sha256": "c02331283aae3b0ce02e5eec3caf833cccd9baa0426141d343acfc7393eca82d"
    },
    {
      "file": "media/cctv-20200515-interview.jpeg",
      "original_url": "https://p1.img.cctvpic.com/cportal/cnews-yz/img/2020/05/15/1589543499218_393_1611x895.jpeg",
      "source_id": "B2",
      "identity": "后续处置桥面配图，不反推精确抑流板尺寸",
      "bytes": 188705,
      "sha256": "96a0ca40f92bc87ab6d53b1190b27e07d845adbe11276e20ad2624837d648abf"
    },
    {
      "file": "research/sensitivity.pdf",
      "original_url": "https://pubs.cstam.org.cn/data/article/kqdlxxb/preview/pdf/kqdlxxb-38-4-694.pdf",
      "source_id": "P2",
      "identity": "学会期刊PDF本地教学存档",
      "bytes": 7054103,
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    },
    {
      "file": "research/humen-deck-author-paper.pdf",
      "original_url": "https://www.dengteam.com/uploadfile/2019/0127/20190127044127518.pdf",
      "source_id": "P3",
      "identity": "作者PDF本地教学存档",
      "bytes": 852095,
      "sha256": "81e6452df06fb21af20662aa9c32dd00971ad790286dd8b38230d40ded477c6e"
    }
  ],
  "model": {
    "kind": "source-dimensioned kinematic reconstruction + pedagogical amplitude equation",
    "main_span_m": 888,
    "deck_full_width_m": 35.6,
    "girder_depth_m": 3.01,
    "hanger_spacing_m": 12,
    "local_dependencies": "../C04_塔科马抗风/vendor/ + ../dialogue-player.mjs",
    "physical_coordinates": "x longitudinal, y transverse, z up in metres; Three V(x,y,z)=(x,z,-y)",
    "geometry_limits": "塔锚、主缆横距、鼻尖折点及附属构件细部为假设；不能冒称原CAD",
    "response": {
      "equation": "dA/dt=(sigma(U,shape)-zeta*omega)*A-beta*A^3",
      "frequency_hz": 0.5,
      "strouhal": 0.15,
      "characteristic_depth_m": 3,
      "beta": 3.5,
      "initial_amplitude_m": 0.008,
      "shape_sigma": {
        "clean": 0.058,
        "water": 0.16,
        "spoiler": 0.014
      },
      "status": "全部动力学系数均为教学选择，无实桥标定；不输出预测风速/安全判定",
      "frequency_lock": "在自选频比带内使响应频率贴近自选fn，表示互锁趋势；并非CFD耦合求解"
    },
    "display": {
      "deformation_factor": 60,
      "section_displacement_factor": 4,
      "member_thickness_factor": 1,
      "hanger_display_diameter_m": 0.16,
      "hanger_thickening_factor": 3.076923076923077,
      "marker_radius_m": 0.75
    },
    "finite_amplitude_is_not_safe_to_drive": true,
    "torsion_mode_is_kinematic_comparison_not_flutter_solver": true
  },
  "dialogue": {
    "file": "dialogue.json",
    "turns": 12,
    "status": "冻结；不在本子任务调用付费音频",
    "sha256": "0f6c23a556e4f8e34a097126072850c377f4681a4c04b0eb064baa872703a24d",
    "narrator_sha256": "562e0642526fc58e121b3ad02be4e94c1c256295f6efd1809eef0381ff1d5de3",
    "target_audio": "media/dialogue-v2.mp3",
    "target_timing": "media/dialogue-v2-timing.json",
    "cue": "12轮index映射；共享audio.dialogueTiming的整轮/相对比例；手动交互暂停语音并取消当轮自动控制"
  },
  "rights": "原新闻照片、论文和截图仅内部教学/备课引用，保留原出处与标识；不把有来源视为有公开分发授权。Three依赖沿用原许可证。"
}