计入结构几何非线性影响时斜拉桥可靠度分析

应用响应面法，考虑斜拉桥的几何非线性效应以及材料、几何尺寸、外部荷载等的随机性，分析了斜拉桥正常使用极限状态下的可靠度，研究表明响应面法是求解斜拉可靠度的有效方法，不计入几何非线性，结构计算结果偏于不安全，因而，在斜拉桥的可靠度分析中有必要计入结构几何非线性的影响。

Reliability Analysis of Cable-stayed Bridges Considering Geometrical Non-linearity

In this paper, response surface approach is utilized to analyze reliability of cable - stayed bridges under serviceability limit states on the basis of considering geometrical nonlinearities of cable - stayed bridges and stochastic of materials, geometrical size, load, etc. The results show that response surface is an efficient approach to analyze reliability of cable- stayed bridges, the structural calculating results are unsafe when not considering the geometrical non- linearity, therefore, it is necessary to consider the geometrical nonlinearity in the reliability analysis of cable - stayed bridges.