基于响应面法的车行索道桥非线性随机静力分析

摘要

采用响应面法对某大跨径车行索道桥进行了非线性随机静力分析，考察了结构参数和活载等因素的随机性对桥梁结构的几何非线性力学行为的影响。研究表明，响应面法是索道桥非线性随机静力分析的有效方法。索道桥的主要构件及其材料特性、几何尺寸和外部荷载的随机变异性对其成桥状态的结构响应值都有不同程度的影响。而主索的弹性模量又是其中影响最大的因素，在施工阶段应对其采取预控措施以减少或避免其量值的随机波动所造成的不利影响。%Nonlinear stochastic static analysis is performed by response surface method (RSM)for a long-span cableway bridges for truck traffic,and the influence on geometric nonlinear mechanics behaviors by randomicity of factors such as structure parameters and live loads is investigated.The study indicates that RSM is effective in nonlinear stochastic static analysis of cableway bridges.Its main structure elements and their material charac-teristics,geometric dimensions and external loads all have impacts on the value of structure response of the fin-ished bridge in different degrees.Among elastic modulus of main cables,the pivotal factor on structure respon-ses is greatest.Then control measurements of prevention should be taken to avoid or reduce unfavorable random fluctuation.