单索面曲梁人行悬索桥设计探讨  

Discussion on the Design of Single Cable Surface Curved Pedestrian Suspension Bridge

作　　者：邱永兴 Qiu Yongxing(Xiamen Municipal Engineering Design Institute Co.Ltd.,Xiamen,Fujian 361009)

机构地区：[1]厦门市市政工程设计院有限公司,福建厦门361009

出　　处：《江西建材》2024年第4期116-119,127,共5页

摘　　要：单索面曲梁人行悬索桥桥型新颖美观,空间异型曲面结构受力复杂。单侧悬吊曲梁承受偏心力矩和水平分力,通过调整三角形截面桁架梁的重心位置和主梁悬吊点的高度,桁架梁上弦杆和下弦杆的水平径向抵抗力均指向曲线外,实现曲线杆件以轴向受拉为主,提高其稳定性。单侧倾斜空间索面布置于曲梁外侧,利用有限元迭代计算修正空间主缆节点坐标、内力及吊索张拉力,得到成桥线形。斜塔两侧主缆形成水平夹角,通过在塔顶张拉2根背索平衡主缆水平分力,确保主塔的整体稳定性。结合跨径300 m单索面曲梁人行悬索桥设计,有限元模型计算结果表明,承载力和变形满足规范要求,为同类型桥梁设计提供参考。The single cable surface curved beam pedestrian suspension bridge is a novel and beautiful bridge type,and the spatial irregular curved structure is subjected to complex forces.The single-sided suspended curved beam bears eccentric moment and horizontal force.By ad-justing the center of gravity of the triangle truss beam and the height of the overhang points,the horizontal radial resistance of the upper and lower chords of the truss beam points out of the curve,achieving that the curved members are mainly subjected to axial tension and improving their stability.The finite element iterative calculation is used to correct the coordinates,and the tension forces of hangers,obtaining the bridge shape.The main cables on both sides of the inclined tower form a horizontal angle.By tensioning two back cables at the top of the tower to bal-ance the horizontal force,the overall stability of the tower is ensured.Combined with the design of a 300 m span single cable surface curved beam pedestrian suspension bridge,the finite element model calculation results show that the bearing capacity and deformation meet the re-quirements of the specifications,providing reference for the design of similar bridges.

关 键 词：人行悬索桥 单索面 曲梁 桥梁设计 结构计算 

分 类 号：U441[建筑科学—桥梁与隧道工程] U448.25[交通运输工程—道路与铁道工程]