超大跨度斜拉桥考虑行波效应的地震动随机响应研究  

Stochastic seismic response of super-long-span cable-stayed bridges under excitation of traveling waves

作　　者：武芳文[1] 薛成凤[2] 赵雷[3] 

机构地区：[1]长安大学公路学院,中国西安710064 [2]西南科技大学土建学院,中国四川绵阳621010 [3]西南交通大学土木工程学院,中国成都610031

出　　处：《地震学报》2010年第2期193-202,共10页Acta Seismologica Sinica

基　　金：国家科技支撑计划项目(2006BAG04B00);长安大学科技创新基础研究支持计划项目(CHD2009JC043)资助

摘　　要：斜拉桥地震反应不同于其它桥型,具有明显的空间耦合效应.利用有限元理论对苏通长江公路大桥的空间抗震性能进行分析,重点研究行波效应对结构响应的影响,并与一致激励计算的结果进行比较,为大跨度斜拉桥抗震分析采用随机方法提供了一定的参考依据.研究结果表明,行波效应对斜拉桥结构内力有显著的影响,大跨度斜拉桥抗震性能分析必须考虑行波效应.而行波效应的影响与结构自身动力特性、视波速、构件位置及研究响应类型(位移与内力)相关.Seismic response of the cable-stayed bridge is different from other type bridges with obviously spatial coupling effect.Spatial seismic behavior of the Su-Tong Yangtze river highway bridge is studied by finite element modeling,and the effect of seismic response on this bridge under excitation of traveling waves is analyzed.Our analysis result is compared with that under the coincident earthquake excitation,which provided a reference for seismic analysis of the long span cable-stayed bridges with the method of stochastic vibration.The results show that traveling wave effect has an important implication on the seismic response of cable-stayed bridges,as a result,it is important to consider traveling wave effect in studying seismic response of the long span cable-stayed bridges.The influence of traveling wave is related to the dynamic characters of the structure,wave velocity,component location and the response type（displacement and internal force）.

关 键 词：桥梁工程 随机振动 斜拉桥 地震动 行波效应 

分 类 号：P315.9[天文地球—地震学]