空间地震动作用下大跨度拱桥地震响应分析  

Seismic response of long-span arch bridge under spatially variable seismic exicitation

作　　者：李正英[1] 李正良[1] 

机构地区：[1]重庆大学土木工程学院,重庆400030

出　　处：《重庆大学学报（自然科学版）》2009年第8期920-924,936,共6页Journal of Chongqing University

基　　金：国家重大基础研究前期专项(2003CCA01500)

摘　　要：基于空间非平稳地震动场模型,应用谐波合成法模拟生成了用于空间地震动输入的地震动加速度时程。在此地震动输入下,以重庆菜园坝大桥作为模型原型,采用时程分析方法详细研究了此种大跨度拱与刚构组合桥在一致输入、行波输入和多点输入下的地震响应特性。分析结果表明,地震动空间变化对主拱的轴力和拱桥跨中构件对称反应影响显著,使其大部分反应明显增大;而刚构的大部分内力都有减小。Based on a spatial nonstationary model of seismic ground motion, the seismic acceleration time history are simulated by the wave superposition method. And then taking CaiYuanBa arch bridge in Chongqing as original model , this paper utilizes time-history analysis method to analyze the seismic response characteristic of this type of long-span arch bridge by support consistent or multi-support seismic excitation. The numerical results indicate that the spatial variation of seismic ground motion have significant effect on the response of the arch bridge. Thrust of arch rib and vertical displacement, internal force of arch crown are increased greatly, but most internal forces of stiffener support are reduced.

关 键 词：拱桥 空间地震动 地震响应 

分 类 号：TU331.4[建筑科学—结构工程]