对于大跨径斜拉桥来说 ,几何非线性效应比较显著 ,材料、几何尺寸、外部荷载等的随机性 ,对斜拉桥的结构响应影响较大。应用响应面法对大跨径斜拉桥进行了非线性随机静力分析。研究表明响应面法是斜拉桥非线性性随机静力分析的有效方法 ,在斜拉桥的静力分析中 ,有必要考虑材料、几何尺寸、外部荷载等的随机性 For long-span cable-stayed bridges, the geometric nonlinear effect is quite significant. The randomness of material, geometry, external load and so on have a great influence on the structural response of cable-stayed bridges. The nonlinear stochastic static analysis of long-span cable-stayed bridges is carried out by response surface method. The research shows that response surface method is an effective method for nonlinear stochastic static analysis of cable-stayed bridges. In the static analysis of cable-stayed bridges, it is necessary to consider the randomness of materials, geometrical dimensions and external loads