地震动斜入射对车桥系统地震响应的影响  

Effect of oblique incidence of seismic wave on seismic response of a train-bridge system

作　　者：乔宏 夏禾[2] 杜宪亭[2] QIAO Hong;XIA He;DU Xianting(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《哈尔滨工程大学学报》2019年第9期1629-1635,共7页Journal of Harbin Engineering University

基　　金：国家重点基础研究发展计划(2013CB036203);国家自然科学基金项目(51208027)

摘　　要：为了研究山区地形条件及地震动斜入射对车桥系统地震响应的影响,本文基于粘弹性边界理论,建立了地震剪切波斜入射条件下的局部场地模型。通过将输入地震动转化为人工边界上的等效荷载,获得考虑地形条件和入射角度影响的地震动时程,编制程序获得车桥系统的动力响应,并以列车通过实际桥梁为算例进行了分析。研究结果表明:局部地形条件对车桥系统地震响应的影响不可忽视,否则会导致计算结果偏于不安全;地震剪切波入射角度对车桥系统地震响应的峰值及其出现时间均有影响,只研究地震剪切波垂直入射的情况并不全面,应综合考虑各个角度以确定最不利情况。To study the influence of local topography and the incident angle of seismic wave on the seismic response of a train-bridge system,a finite element model of local site considering topographic effects and the oblique incidence of SV wave was established based on the theory of viscous-spring artificial boundary.The seismic time history curves at bridge supports were obtained by converting the incident seismic wave into equivalent loads acting on the artificial boundary.Then a dynamic analysis of a train-bridge system subjected to multi-support seismic excitations was performed by programming,with a train traversing a bridge as a case study.The results show that the local topography cannot be ignored for the seismic response of the train-bridge system;otherwise,the seismic response of the train-bridge system may be underestimated.In addition,the incident angle of SV wave can influence the peak value and the peak occurrence time of the seismic response of the train-bridge system;therefore,it is insufficient to only consider the perpendicular incidence of SV wave;instead,various incident angles should be comprehensively considered for determining the most unsafe condition.

关 键 词：桥梁 车桥耦合振动 动力分析 地震 地形效应 入射角度 粘弹性人工边界 行车安全 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]