摘要
以斜拉桥静载弯曲能量作为目标函数,综合考虑斜拉索垂度效应、梁柱效应和大位移效应,并采用混合法求解系统方程,确定斜拉索成桥时的初始张拉力。以由此确定的斜拉桥初始状态作为施工非线性倒拆分析的初始状态,倒拆分析的过程中需要考虑相应阶段的混凝土收缩、徐变影响,倒拆分析的结果作为斜拉桥施工阶段的斜拉索张拉力,即斜拉桥施工阶段的最终优化结果。该方法经过算例验证,取得了较好的结果,为斜拉桥的施工控制提供了依据。
This paper is concerned with the nonlinear static reverse analysis of long-span cable-stayed bridges during construction. The bending strain energy of cable-stayed bridge is chosen as the objective function, and an iterative-incremental procedure which considers the cable sag effect, beam-column effect and large displacement effect is described to solve the nonlinear system equation and calculate the initial cable forces of a cable-stayed bridge. The influence of concrete creep and shrinkage is considered and the initial shape of cable-stayed bridge is chosen as the first step. The results of nonlinear reverse analysis are used as the cable forces of cable-stayed bridge during construction, that is, the optimal results of the cable-stayed bridge during construction.
出处
《工程力学》
EI
CSCD
北大核心
2004年第5期31-35,共5页
Engineering Mechanics
基金
北京市自然科学基金(8982010)
关键词
斜拉桥
非线性
倒拆分析
收缩
徐变
Bending strength
Construction
Creep
Numerical methods
Reverse engineering
Shrinkage
