大跨度部分斜拉桥最大单悬臂阶段几何非线性影响分析

Geometric Nonlinear Analysis of Large-span Extradosed Cable-stayed Bridge of Largest Single Cantilever Stage

针对部分斜拉桥的几何非线性因素对桥梁结构的影响进行分析研究.首先介绍了斜拉桥几何非线性分析的基本理论,并以长山大桥为例,用MIDAS软件建立有限元计算模型,考虑斜拉索垂度效应、P-delta效应、大变形效应等因素对该桥进行受力分析.结果表明,几何非线性对结构变形产生较大影响,在施工时应加以重视.

The impact of extradosed cable -stayed bridge structure caused by the geometric nonlinear factors was analyzed .Several sources and principles of geometric nonlinearity of extradosed cable -stayed bridge was introduced .Taking Changshan bridge as example , in the consideration of the sag effects , Pdelta effect and large deformation effect , a finite element model was developed and computed using MIDAS software .The results show that the geometric nonlinear factors greatly affect the structure deformation , which should be valued at the construction site .