空间主缆悬索桥结构行为影响因素分析

Analysis of Influencing Factors on Structural Behavior of Suspension Bridges with Spatial Main Cables

摘要:

针对空间主缆悬索桥的主要结构构件, 建立了55个不同主缆横向张开量和竖向垂跨比悬索桥的数值模型。利用数值计算方法,考虑几何非线性,分析了空间主缆悬索桥主缆内力、竖向刚度、横向刚度和扭转刚度对横向张开量和竖向垂跨比的结构行为影响因素。结果表明:存在一个虚拟的横向跨度数值,利用这个数值和基准状态可以精度很高的估算任意横向张开量下的主缆内力;存在一个等竖向刚度张开量使得不同竖向垂度的空间主缆悬索桥的竖向刚度相等;存在一个等扭住的横向张开量使得不同竖向垂度的空间主缆悬索桥扭转刚度相同。

Abstract:

Based on the primary structural components of suspension bridges with spatial main cables, 55 numerical models of suspension bridges with different lateral spread values of main cables and different vertical sag-span ratios are established in this paper. Adopting numerical calculation methods and considering geometric nonlinearity, the influencing factors of structural behavior, including main cable internal force, vertical stiffness, lateral stiffness and torsional stiffness, are analyzed with respect to the lateral spread and vertical sag-span ratio of suspension bridges with spatial main cables. The results indicate: there exists a virtual lateral span value, which can be used to estimate the main cable internal force under arbitrary lateral spread with high precision together with the reference state; second, there is a lateral spread for equal vertical stiffness, at which suspension bridges with spatial main cables of different vertical sags share identical vertical stiffness; third, there exists a lateral spread for equal torsional stiffness, at which suspension bridges with spatial main cables of different vertical sags have the same torsional stiffness.