某大跨度地锚式人行悬索桥静动力分析

Static and Dynamic Analysis of a Long-Span Ground-Anchored Pedestrian Suspension Bridge

为了验算结构在静力荷载作用下全桥位移、主缆和吊杆应力是否满足规范要求,分析抗风缆对大跨径人行悬索桥横向刚度的贡献以及自振特性的影响。文章以一座主跨223.5m双塔地锚式人行悬索桥为实例,利用有限元软件MIDAS/Civil建立模型,通过节点坐标和桁架单元初拉力的反复迭代,研究得出主缆和吊杆的初始内力、桥梁结构初始刚度及悬索桥初始平衡状态,为手工寻找初始平衡状态提供一种方法。研究通过在恒载、人群荷载、风载的最不利荷载工况下,对全桥结构进行静力计算分析,各项计算结果均满足规范要求。

To check whether the displacement of the whole bridge,the stress of the main cable and the suspender meet the requirements of the code under the static load,the contribution of the wind-resistant cable to the lateral stiffness of the long-span pedestrian suspension bridge and the influence of the natural vibration characteristics were analyzed.In this paper,a 223.5 M-span twin-tower ground-anchored pedestrian suspension bridge was taken as an example,and a finite element software midascivil was used to establish the model,the initial internal forces of the main cable and the suspender,the initial stiffness of the bridge structure and the initial equilibrium state of the suspension bridge bridge were obtained.Through the static calculation and analysis of the full bridge structure under the most unfavorable load conditions of dead load,crowd load,and wind load,it is found that all calculation results meet the requirements of the code.