140m跨度预应力空间悬索桁架桥结构分析

某过河管道桥跨度140m,采用预应力空间悬索桁架的结构形式。结合工程设计实践,采用非线性有限元软件ANSYS对结构静力性能进行分析,确定结构布置方案;应用BlockLanczos法对索桁架桥进行自振特性分析,得到结构各阶频率和振型;应用非线性随机模拟风振分析法对结构方案进行整体分析得到全桥在脉动风荷载作用下的位移响应时程。计算结果表明,结构整体工作性能良好,承重索与抗风索的截面积对桥体动力稳定性均有较大影响。

Structure Analysis of a 140m Span Prestressed Space Suspension Cable Truss Bridge

A pipe-carrying bridge is a prestressed space suspension cable truss structure with 140m span.Nonlinear FEM software ANSYS is used to analyze the static performance of the bridge and determine the structure scheme. Then a frequency analysis with Block Lanczos method is carried out to investigate the nature frequency and vibration mode of the cable truss structure. The wind pressure time series is simulated and transient analysis is made using the pressure time series to get the displacement response of the whole bridge.The research identificated that the structure has sound work ability and the areas of the cable have a remarkable effect on the dynamical stability.