Nonlinear stochastic static analysis is carried out for the maximum deflection of main girder of a kilometer-class cable-stayed bridge by response surface method (RSM). The law of main girder' s deflection is researched with the variation of structural parameters such as material properties, geometric dimensions and external load, etc. Numerical results show that the reliability index of main girder' s deflection has different sensitivity to the mean value and standard deviation of random variables. The variation of the modulus of stay cables has significant influence on the deflection of main girder of kilometer-class cable-stayed bridge compared to other random variables. The variation of the section area of main girder also has influence on the deflection of kilometer-class cable-stayed bridge, but is different from the influence on the deflection of under-kilometer cable-stayed bridge.%采用响应面法对千米级斜拉桥主梁最大挠度进行静力可靠度分析,考察主梁最大挠度随结构材料、几何尺寸及外荷载等不确定因素的变异而发生变化的规律.算例研究表明,主梁挠度可靠指标对各随机变量平均值和标准差的敏感程度不同.同其它随机变量相比,斜拉索弹性模量变异对千米级斜拉桥主梁挠度影响最为显著.主梁截面面积变异对千米级斜拉桥主梁挠度具有显著的影响,但与对千米以下斜拉桥主梁挠度的影响规律不同.
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