基于能量法的隔震连续梁桥地震响应分析  

Seismic Response Analysis of Isolated Continuous Girder Beam Bridge Based on Energy Method

作　　者：彭刚辉[1,2] 姚国文 贾宏宇[3] 郑史雄[3] 李世亚[2] PENG Ganghui;YAO Guowen;JIA Hongyu;ZHENG Shixiong;LI Shiya(The Engineering&Technical College of Chendu University of Technology,Leshan 614000,China;State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]成都理工大学工程技术学院,四川乐山614000 [2]重庆交通大学山区桥梁与隧道工程国家重点实验室,重庆400074 [3]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2023年第9期89-95,共7页Railway Standard Design

基　　金：国家自然科学基金面上项目(52178169,52178273);四川省科技计划项目(2019YJ0243);乐山市重点科技计划项目(20GZD042)。

摘　　要：为研究地震波、桥梁结构基本周期、阻尼模型对地震输入能、阻尼耗能及滞回耗能产生的影响,基于地震能量法,以铅芯橡胶支座隔震连续梁桥为例,根据桥墩高度的不同建立4种工况,阻尼计算采用3种阻尼模型;根据地震波峰值速度(PGV)与峰值加速度(PGA)比值,从PEER中选取6条地震波,利用有限元软件建立简化数值力学模型,并进行非线性动力时程地震响应分析。分析结果表明:地震波的|PGV/PGA|值对地震输入能、阻尼耗能及滞回耗能均产生较大影响;桥梁结构基本周期对地震输入能的影响较小,对阻尼耗能及滞回耗能会产生一定影响,基本周期较低的桥梁结构,其隔震支座滞回耗能更明显;阻尼模型对地震输入能影响较小,对阻尼耗能及滞回耗能会产生较大影响。因此,采用能量法对隔震连续梁桥进行抗震分析时,采用瑞利阻尼进行阻尼计算更有利于保护桥墩;同时,地震波不能随意选取,应根据桥址处的场地类型及设防烈度进行选择。In order to study the influence of seismic wave,fundamental period of bridge structure and damping model on input energy of seismic,damping energy and hysteresis energy,four working conditions are established according to different height of the pier based on the seismic energy method with reference to the lead rubber bearing isolated continuous girder beam bridge,and three damping models are used for the calculation of damping.According to the ratio of seismic wave peak velocity(PGV)to peak acceleration(PGA),six seismic waves are selected from PEER.The numerical mechanics model is established by using finite element software,and seismic response analysis of nonlinear dynamic time history is carried out.Study results are obtained as follows:the value of|PGV/PGA|of seismic wave has a great influence on input energy,damping energy and hysteresis energy;the fundamental period of bridge structure has a little influence on input energy,but certain influence on damping and hysteresis energy;the hysteresis energy of isolation bearings of bridge structure with lower fundamental period is more obvious;the damping model has a little influence on seismic input energy,but great influence on damping and hysteresis energy.Therefore,the calculation of damping with Rayleigh damping is more conducive to protect piers when the energy method is used for seismic analysis of isolated continuous girder beam bridge;and seismic wave should not be selected randomly,but selected according to the type of site and the seismic fortification intensity.

关 键 词：能量法 隔震连续梁桥 地震响应 输入能 阻尼模型 阻尼耗能 滞回耗能 

分 类 号：U24[交通运输工程—道路与铁道工程] U448.215[建筑科学—桥梁与隧道工程] U442.55