斜拉索的施工随机误差对斜拉桥的影响

Response Analysis of Cable-Stayed Bridges Due to Random Deviation of Stay Cable Tension

在斜拉桥的施工过程中,斜拉索的索力误差往往导致斜拉桥整体结构的内力状态和外形偏离设计目标。通过对以往数座已经施工完成斜拉桥索力数据的随机方法处理,运用有限元软件ANSYS概率设计系统中的蒙特卡罗法,综合考虑斜拉桥结构几何非线性效应等因素,主要分析了斜拉索索力值的随机施工误差对斜拉桥结构的响应以及误差参数变化带来斜拉桥结构的影响,定量给出了斜拉索索力值随机施工误差对斜拉桥结构的不利影响。

In the construction process of a cable-stayed bridge,the erection deviation of the cable tension is inevitable.However,it will cause the deviation from the design state of whole structure finally,such as the stress and profile of the main component.This paper analyzes the structural response of cable-stayed bridge under random construction deviation of cable tension and the variations of the structural response under different error parameters by processing of the cable tension of several constructed bridges with random method.The method is based on the Monte-Carlo methodology in the Probabilistic Design System of the finite element software ANSYS and considered the effects of geometric nonlinearities of cable-stayed bridge.The result shows the relation the random construction deviation of the cable tension and the structural response of cable-stayed bridge.