高墩部分斜拉桥非线性稳定分析

Nonlinear Stability Analysis of Extra-dosed Cable-stayed Bridge with High Piers

论述了高墩结构的两类稳定问题,在考虑了几何非线性和材料非线性的基础上,结合仙神河斜拉桥的工程实例,利用大型通用有限元程序ANSYS,选取各种单元建立有限元模型,对比分析了该部分斜拉桥在最高裸墩状态和最大悬臂状态下的稳定性。通过计算分析可知,高墩结构的非线性影响很大,考虑非线性影响的稳定分析对于指导工程实践具有更好的实际意义。

Two kinds of stability problems with thin-wall and high pier structure are discussed. By utilizing the great universal finite element program ANSYS, some types of finite element models are established for the nonlinear stability analysis of Xianshenghe Cable-stayed Bridge at the state of the naked pier and the longest can- tilever on the basis of both geometrical and material nonlinearity. The conclusion indicates that nonlinearity has great influence on the thin-wall and high pier structure and should be considered in practical engineering.