大跨度桥梁极限承载力的几何与材料非线性耦合分析

GEOMETRICAL AND MATERIAL NONLINEAR ANALYSIS FOR DETERMINING ULTIMATE LOAD CAPACITY OF LONG-SPAN BRIDGES

介绍用几何非线性及材料非线性耦合的方法分析大跨度桥梁的极限承载力问题。几何非线性采用UL列式法，材料非线性采用分层有限单元法，两者结合达到了既保证计算精度又节省内存及机时的目的。通过算例验证，该法已被成功地应用于一座铁路是索桥方案的极限承载力分析。

An analytical procedure considering both geometrical and material nonlinearities for determining ultimate load capacity of long-span bridges is described in this paper. Updated Lagrangian formulation combined with layered Finite Element Method is adopted for dealing with geometrical as well as maerial nonlinearities of bridge structures which made it possible to ensure the accuracy of calculation and to save computational time and storage simultaneously. The procedure has been verified by experimental results and employed to analyse an altemaive of railload suspension bridge successfully.