{
 "schema_version":"1.0","checked_on":"2026-09-27","units":"m",
 "canonical_coordinates":{"x":"桥纵向；斜拉锚固内部局部 x 为索轴","y":"横向","z":"向上","three_mapping":"V(x,y,z)=(x,z,-y)","stayanchor_display_rotation":"绕 Three.js z 轴 35°；仅整体摆放，不改变尺寸"},
 "evidence_policy":"构造关系按原厂图核对；外廓尺寸、配筋与构件数量均为本模型教学假定，钢绞线名义直径15.7mm为来源产品体系使用规格。未复原具体实桥或原厂型号。",
 "models":{
  "archhanger":{
   "type":"实心圆钢吊杆螺纹叉耳—横向销轴—中间眼板；下承式拱桥下吊点教学局部",
   "pin_axis":"physical y","pin_center_xz":[0,0.88],"pin_radius":0.06,"pin_length":0.366,"pin_hole_radius":0.0605,
   "fork_inner_faces_y":[-0.085,0.085],"fork_outer_faces_y":[-0.15,0.15],"fork_ear_thickness":0.065,"clear_gap_between_fork_ears":0.17,
   "eyeplate_faces_y":[-0.075,0.075],"eyeplate_thickness":0.15,"side_clearance_each":0.01,
   "hanger_rod_radius":0.035,"hanger_rod_z":[1.51,2.60],"shoulder_bore_radius":0.035,"clevis_shoulder_z":[1.37,1.55],"locknut_z":[1.55,1.65],
   "girder_top_z":0.30,"eyeplate_base_z":0.30,"girder_fragment_length":1.50,"girder_fragment_width":0.80,
   "contact_interpretation":"销孔有0.5mm径向教学装配间隙；未求解接触后销轴位移和应力。螺纹只画外露牙顶与孔包络，未复原牙型。",
   "load_path":["主梁和加劲隔板","中间眼板","横向销轴","双叉耳","螺纹肩部","圆钢吊杆","上端节点与拱肋（局部外）"],
   "omissions":["上端节点和完整拱肋","实桥焊缝详图、销轴材料与疲劳验算","螺纹牙型、制造公差与接触变形"]
  },
  "stayanchor":{
   "type":"平行钢绞线可调式梁端锚固；参考RAB类夹片与螺母传力关系",
   "strand_count":19,"strand_nominal_diameter":0.0157,"strand_envelope_radius":0.00785,"strand_pitch":0.052,"strand_outer_centers_radius":0.104,
   "strand_axis_x_range":[-0.68,3.05],"strand_hole_radius":0.0102,"individual_sheath_inner_radius":0.0079,"individual_sheath_outer_radius":0.010,
   "anchor_block_radius":0.24,"anchor_cone_x_range":[-0.49,-0.29],"anchor_cone_radii":[0.0238,0.0165],"anchor_body_x_range":[-0.29,0.32],
   "wedges_per_strand":3,"wedge_count":57,"wedge_outer_radii":[0.0236,0.0163],"wedge_inner_radius":0.00785,
   "bearing_nut_x_range":[-0.235,-0.10],"bearing_nut_inner_radius":0.242,"bearing_nut_outer_radius":0.36,
   "bearing_plate_x_range":[-0.10,0],"bearing_plate_square_side":1.10,"bearing_plate_hole_radius":0.26,
   "concrete_x_range":[0,1.15],"concrete_square_side":1.26,"concrete_bore_radius":0.32,
   "embedded_pipe_x_range":[0,1.48],"embedded_pipe_outer_radius":0.319,"embedded_pipe_inner_radius":0.292,
   "stuffing_box_x_range":[0.32,0.61],"transition_x_range":[0.61,1.70],"transition_inner_radii":[0.233,0.145],"transition_outer_radii":[0.248,0.160],
   "hdpe_x_range":[1.70,3.05],"hdpe_outer_radius":0.160,"hdpe_inner_radius":0.145,"cap_closed_face_x":-0.83,
   "contact_interpretation":"夹片与锥孔留0.2mm可辨间隙；螺纹牙顶与螺母内径的啮合用包络示意，不用于制造。七丝捻纹作为表面辨识线，未逐丝求解。",
   "load_path":["19根钢绞线","各自三瓣夹片","锥孔锚块","环形承压螺母","锚垫板","混凝土主梁锚固块"],
   "omissions":["完整主梁与实桥索塔","夹片细齿、防腐填充料、注入孔与密封件精细分件","量化局部承压、疲劳、接触与张拉损失","螺纹牙型"]
  }
 },
 "display":{"motion":"两个模型均只有静态逐段传力高亮；无自由滑移或伸长动画","explode":"只修改显示变换；每次从装配基准恢复，分解时传力箭头隐藏","cutaway":"仅隐藏指定外壳、近侧耳板或近侧混凝土；不修改原始网格","label_limit":6,"reference_photos":"原厂资料权利归原发布方；仅本地教学核对，无开放出版许可声明"}
}