静风荷载作用下大跨度钢拱桥极限承载力分析  

Ultimate capacity analysis of long-span steel arch bridges under wind loads

作　　者：程进[1] 江见鲸[1] 肖汝诚[2] 项海帆[2] 

机构地区：[1]同济大学桥梁工程系,上海200092 [2]清华大学土木工程系,北京100084

出　　处：《计算力学学报》2003年第4期417-422,共6页Chinese Journal of Computational Mechanics

基　　金：国家自然科学基金 (5989541 0 )资助项目

摘　　要：随着钢拱桥跨径的不断增大 ,钢拱桥的极限承载力问题已引起了人们的广泛重视。本文以上海在建的主跨 5 5 0 m的中承式钢拱桥为例 ,采用几何和材料非线性分析法详细分析了大跨度钢拱桥在静风荷载作用下的极限承载力 。Because of the increasing span of steel arch bridges, the ultimate capacity analysis recently becomes more focusing both on the design and construction. The example bridge is a long-span half-through steel arch bridge of a 550 m central span length under construction in China. The bridge will be the longest central span of any arch bridge in the world. The ultimate capacity of the bridge under wind loads is investigated using the geometrically and materially nonlinear buckling method. Three load combinations are used in the ultimate load capacity analysis of the bridge. Combination I: combined dead and live loads over the entire bridge. Combination II: combined dead and wind loads. Combination III: combined dead load, wind load and live load over the entire bridge, The ultimate load capacity of the bridge is first investigated under load combination I and II. Attention is paid mainly to investigate the load capacity of the bridge under load combination III. In the case of load combination III, the effects of three components of wind loads and wind loads of individual bridge element on the ultimate load capacity of long span steel arch bridges are discussed. The results show that three components of wind loads have significant effects on the ultimate load capacity of long span steel arch bridges when applied wind loads become large.

关 键 词：静风荷载 大跨度钢拱桥 极限承载力 材料非线性分析法 结构分析 几何分析 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U441[交通运输工程—道路与铁道工程]