超大跨度斜拉桥活载几何非线性分析  

Geometrical Nonlinear Analysis under Live Load for Super Long Span Cable-stayed Bridges

作　　者：梁鹏[1] 秦建国[2] 袁卫军 

机构地区：[1]长安大学桥梁与隧道陕西省重点实验室,陕西西安710064 [2]中交第一公路勘察设计研究院,陕西西安710064 [3]河南省驻马店市公路规划勘察设计院,河南驻马店463000

出　　处：《公路交通科技》2006年第4期60-62,共3页Journal of Highway and Transportation Research and Development

摘　　要：进入超大跨度范围后,斜拉桥几何非线性问题更加突出。以主跨为1 088m的苏通大桥为研究对象,采用线性理论、线性二阶理论和非线性理论,分析几何非线性对超大跨度斜拉桥活载效应的影响。研究表明,即使对超过1 000m的公路斜拉桥,采用线性二阶理论(即只需考虑斜拉索弹性模量折减和恒载几何刚度矩阵的影响)计算活载效应完全可以满足工程要求。As cable-stayed bridge span increases, the effect of the geometrical nonlinearity becomes even more significant.Based on linearity, deflection and nonlinearity theory, live load response is analyzed for Sutong Bridge whose main span reaches 1 088re, It is conchided that deflection theory （i. e. equivalent modulus of elasticity of cable stays and geometrical matrix of deadload state are taken into account） can satisfy the engineering requirement even for the highway bridges with main span exceeding 1 000m.

关 键 词：斜拉桥 超大跨度 活载 线性理论 二阶理论 非线性理论 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]