大跨径斜拉拱桥结构受力的敏感性分析

Sensitivity Analysis of Structural Behavior of Long Span Cable-Stayed Arch Bridge

斜拉拱桥是一种多变量结构体系,各设计参数影响结构受力且参数的不同取值对结构的安全性影响存在较大差异。湘潭市湘江四大桥主桥(120+400+120)m斜拉钢管混凝土飞燕式拱桥的参数敏感性分析结果表明,主拱轴线偏差、钢管内混凝土的收缩徐变等对结构的影响较大。

The cable-stayed arch bridge is a kind of structural system with a great deal of variables. Each of the design parameters of the type of the bridge will exert influences on the structural behavior of the bridge, and different values of the parameters will bring about rather great differences to the safety of the structure. The results of sensitivity analysis of the parameters of main bridge of the Fourth Xiangjiang River Bridge in Xiangtan City, a cable-stayed concrete-filled steel tube arch bridge of flying bird type with span arrangement （120 ＋400 ＋ 120） m, indicate that the differences of the main arch axis, shrinkage and creep of concrete in the steel tubes of the Bridge all have considerable influences on the structure.