大跨度桥梁极限承载力的双重非线性分析  

Dual Nonlinear Analysis of the Ultimate Load Capacity of Long-span Bridge

作　　者：彭可可[1] 贺国京[1] 

机构地区：[1]中南林业科技大学土木建筑与力学学院,湖南长沙410004

出　　处：《中南林学院学报》2006年第3期74-77,共4页Journal of Central South Forestry University

基　　金：铁道部科技发展项目"宜万线宜昌长江大桥关键技术研究"(项目批号:2003G035)

摘　　要：从非线性有限元理论出发,基于虚功原理,阐述在几何非线性刚度方程有限元列式中引入非线性本构关系矩阵、合理考虑结构双重非线性问题的理论方法.归纳比较了第一类失稳破坏、第二类失稳破坏及强度破坏等极限承载力问题的概念.对宜昌长江大桥的极限承载力进行了计算分析,总结了具有较普遍意义的同类桥梁极限承载力计算理论及方法.On the basis of virtual work principles and nonlinear finite element theory, the author introduces a feasible method, which analyses the double nonlinear problem of structure by importing the elastic-plastic constitutive relationship matrix into geometric nonlinear FEA equation. For the problem of ultimate load capacity, a series of concepts, such as the first kind of stability, the second kind of stability and the strength damage problem, are compared and summarized. Taking as an example the project of the Yangtse River Bridge in Yichang, the catholicity method to compute the ultimate capacity is brought forward.

关 键 词：桥梁设计 几何非线性 材料非线性 极限承载力 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]