考虑行波效应的高墩大跨刚构桥随机地震动响应研究  

Stochastic seismic responses analysis of long-span rigid-framed bridge with high piers considering travelling wave effect

作　　者：洪浩[1] 郑史雄[1] 贾宏宇[1] 赵博文[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《世界地震工程》2013年第2期132-137,共6页World Earthquake Engineering

基　　金：铁道部科技研究开发计划项目(2010-G018-A-4)

摘　　要：基于随机地震动场功率谱模型和多点地震激励,对ANSYS随机振动计算理论进行了推导,建立了三维有限元模型。研究了不同墩高和视波速时,山区高墩桥梁在强震作用下的随机响应规律,并与一致激励计算结果进行了比较。研究表明:行波效应对高墩大跨刚构桥影响较大且不同墩高时的影响存在较大差别。行波效应对结构的影响与结构自身的特性和视波速有关,对于同一响应,应取不同工况下的最大值作为设计依据,所得结果可为山区高墩大跨刚构桥抗震分析提供参考。Based on Power spectrum model of random ground motion field and multi point seismic excitation, the formula of ANSYS random vibration theory was derived and the three-dimensional finite element model was established. Random response regularities of high-pier bridge subjected to strong earthquakes was researched following various wave velocities and pier height. The results are compared with those under the uniform excitations and the results show that seismic response of high pier and long - span rigid frame bridges is affected significantly by travelling wave effect. And the response regularities of bridges with different height piers could vary significantly. Structures＇ own characteristics and wave velocity are two major factors must be considered. For one same response, the maximum under different working conditions should be taken as designing basis.

关 键 词：桥梁工程 高墩桥梁 随机振动 多点激励 行波效应 

分 类 号：TU311.3[建筑科学—结构工程]