大跨度组合梁斜拉桥成桥状态参数敏感性分析

Parameter sensitivity analysis of the long-span composite girder cable-stayed bridge in the finished bridge state

为保证大跨度钢−混组合梁斜拉桥成桥后的主梁线形和结构各部位的受力均满足规范要求,以赤壁长江公路大桥为研究对象,考虑几何非线性因素建立有限元模型,对桥梁施工全过程进行仿真模拟。研究了成桥状态的主梁线形、控制截面应力、斜拉索索力对钢主梁的重量和弹性模量、桥面板的重量和弹性模量、拉索的弹性模量及温度误差的敏感程度。研究结果表明:钢主梁重量、桥面板重量、拉索弹性模量及温度误差对成桥状态结构行为的影响显著,而钢主梁弹性模量和桥面板弹性模量误差的影响较小。研究结果可为其施工控制中的误差修正、关键控制量确定等提供依据,也可为类似桥梁工程施工提供参考。

In order to ensure the stress of the main girder and structure of long-span steel-concrete composite girder cable-stayed bridge meet the specification requirement,the finite element model was established considering geometric nonlinear factors.The bridge construction process of the Chibi Yangtze River Highway Bridge was simulated.The sensitivity of the weight and elastic modulus of the main beam and bridge deck,elastic modulus of cable and temperature error to the main beam alignment,control section stress and cable force in finished bridge state was investigated.The results show that,the errors of steel main girder weight,bridge deck weight,cable elastic modulus,and temperature have significant effects on the structural behavior of the completed bridge.However,the steel main girder elastic modulus and bridge deck elastic modulus errors have little influence.The research results can provide scientific basis for error correction in construction control,calculating the key control variables,and also provide reference for the construction of the similar types of bridge projects.