倾斜吊杆悬索桥的非线性分析

倾斜吊杆悬索桥的结构分析包含“变作用形式”和大位移两个几何非线性问题。过去习用线性刚度近代、位移增量叠加的方法，并忽略前一个非线性影响或者将二者分开迭代计算，这样误差偏大。本文给出逐步加载、非线性刚度迭代，同时淘汰受压柔性杆件的“并行迭代法”提高了精度。进行了实例计算比较。

A Nonlinear Analysis of Inclined Boom Cable Suspension Bridge

The structural analysis of inclined boom suspension bridge includes following two geometric nonlinear problems,the changing working structure form and the large flect.The analysis used to use the linear stiffness and omit the influnce of changing working structure form or calculate these two problems seperately,so the accuracy is low.This paper proposed a new nlethod called parallel method of eteration that loads step by step and uses the nonlinear stiffness and eleminates impressed booms at the same time.Thus, the accuracy is improved.