轻轨高架桥地震响应PGA/PGV分析:Part Ⅰ近断层效应的影响  

Analysis on PGA/PGV specific seismic response of urban light rail transit viaduct:Part Ⅰ Effect of fault rupture

作　　者：陈令坤 韩静涛[2] 徐定超 周欣 王琨 杨汉彬[1] 张楠[4] CHEN Lingkun;HAN Jingtao;XU Dingckao;ZHOU Xin;WANG Kun;YANG Hanbin;ZHANG Nan(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Civil Science and Engineering,Yangzhou University,Yangzhou Jiangsu 225127,China;Yangzhou Construction Safety Supervision Station,Yangzhou Jiangsu 225002,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]扬州大学建筑科学与工程学院,江苏扬州225127 [3]扬州市建筑安全监察站,江苏扬州225002 [4]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2018年第3期86-94,共9页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金(51778630;51778577;51508495);江苏省自然科学基金(BK20161337);中国博士后科学基金(2016M592695;2015M581702);2016年度江苏省普通高校专业学位研究生实践创新计划项目(SJZZ16_0262)~~

摘　　要：以城市轻轨钢筋混凝土高架桥为研究对象,分别输入脉冲型、无脉冲型近断层地震和远场地震3种不同类型的地震,建立高烈度区地震作用下的非线性全桥模型,计算了水平及竖向地震作用下桥梁的弹塑性响应,分析了地震峰值加速度与地震峰值速度比值(PGA/PGV)对桥梁地震响应的影响.研究表明,时域分析时,脉冲型近断层地震会造成较大的梁体位移;对于梁体内力,相比其他类型地震,非脉冲地震造成的桥梁惯性力可能较大.频域分析时,相比非脉冲型近断层地震及远场地震,脉冲型近断层地震在较低的频段对桥梁横向响应的影响较大;对于竖向响应,脉冲型近断层地震可以在二阶竖向自振频率影响桥梁地震响应,非脉冲型近断层地震及远场地震在一阶竖向自振频率影响桥梁地震响应.The global nonlinear finite element calculation model of Urban I.ight Rail Transit Via duct （ULRTV） in a high seismic region is set up, then the elastic plastic seismic responses of the bridge subjected to the combined effect of vertical and horizontal earthquakes are calculated under pulse type Near Fault Ground Motions （NFGMs）, non pulse type NFGMs and Far Field Ground Motions （FFGMs）. And the influence of the Peak Ground Acceleration and Peak Ground Velocity （PGA/PGV） ratio on the seismic response of the bridge is presented. Results demon strate that the pulse type NFGMs results in the larger lateral displacement at the rood span of the girder when time domain analysis. The pulse type NFGMs and the FFGMs maybe bring out the greater internal force compared to the non pulse typeNFGMs. While under frequency domain a nalysis, the pulse type near fault ground motions greatly impact the seismic lateral seismic re sponse of the bridge in the low frequency band compared to the non pulse type NFGMs and FF GMs. As for the vertical seismic response of the bridge, pulse type NFGMs influence the response in the second order natural vibration frequency, and the non pulse type NFGMs and FF GMs influence the response in the first order natural vibration frequency.

关 键 词：地震响应分析 城市轻轨高架桥梁 近断层地震 地震峰值加速度与速度比值 频谱特性 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]