大跨度拱桥的非线性与稳定分析

Nonlinearity and Stability Analysis for A Long-Span Arch Bridge

考虑施工过程中结构体系不断变化、荷载逐步增加以及拱桥结构大位移等因素 ,建立了大跨度拱桥结构的非线性稳定计算模型 ,编制了相应的程序 .文中对某拱桥施工全过程的稳定性和几何非线性进行了模拟计算 ,得出了各个施工阶段稳定安全和非线性影响系数 ;

In view of the effects of structural system change as well as the ever increasing loads during erection phases, an approach to the stability analysis of the arch bridge is presented. A program is developed and it can predict the nonlinear buckling of the arch bridge. The elastic lateral stability and the geometric nonlinear influential factors of a long span arch bridge during the construction phases are analyzed. Such analyses have provided the theoretical basis for the construction of the long span arch bridge.