考虑同球向双球面支座阻尼间隙的简支梁桥减隔震性能分析  

Analysis of the influence of damping gap of the same spherical direction double spherical surface seismic mitigation and isolation bearing on seismic isolation performance

作　　者：于伟栋 张永亮[1] 吴延伟[2] 王希慧 YU Weidong;ZHANG Yongliang;WU Yanwei;WANG Xihui(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Yiyuan Survey and Design Group Co.,Ltd,Xi’an 710043,China;Hengshui Baoli Engineering Rubber Co.,Ltd,Hengshui 053000,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁第一勘察设计院集团有限公司,陕西西安710043 [3]衡水宝力工程橡胶有限公司,河北衡水053000

出　　处：《铁道科学与工程学报》2019年第9期2240-2247,共8页Journal of Railway Science and Engineering

基　　金：中国铁建股份有限公司科研项目(15-C41);中铁第一勘察设计院集团有限公司科研(软件)开发项目(院科15-08)

摘　　要：为研究同球向双球面纵向活动支座阻尼间隙对高速铁路简支梁桥地震响应的影响,综合考虑支座摩擦及减震榫阻尼器非线性,提出同球向双球面支座的有限元模拟方法,进行罕遇地震作用下顺桥向动力时程分析。研究结果表明:基于同球向双球面支座的简支梁桥减隔震体系具有隔断地震荷载和减小墩梁相对位移的双重控制作用;适当减小活动支座阻尼间隙可在保证墩底弯矩不显著增加的前提下大幅减小墩梁相对位移量;适当调整活动支座阻尼间隙的大小既可以对活动支座本身各部件之间的耗能量关系进行重分配,也可以优化固定支座和活动支座之间的耗能关系;活动支座耗能能力随其阻尼间隙的增大而降低。In order to study the influence of longitudinal damping gap of the same spherical direction double spherical surface seismic mitigation and Isolation movable bearing on the seismic response of simply-supported beam bridge on high-speed railway,in this paper,a finite element model of double spherical bearings with the same spherical direction was proposed,considering the friction of bearings and the non-linearity of shock absorber dampers.The along-bridge nonlinear dynamic time-history analysis under rare earthquakes was carried out.The results show that simple supported beam bridge isolation system based on same spherical direction double spherical surface seismic mitigation and isolation bearings have the dual control effect of isolating seismic load and reducing the relative displacement of pier and beam.Appropriately reducing the damping gap of movable supports can greatly reduce the relative displacement of piers and beams without significantly increasing the bending moment at the bottom of piers.Properly adjusting the damping gap of the movable support can redistribute the energy consumption relationship between the components of the movable support itself,and optimize the energy consumption relationship between the fixed support and the movable support.The energy dissipation capacity of the movable bearing decreases with the increase of its damping gap.

关 键 词：高速铁路 简支梁桥 同球向双球面支座 地震反应 纵向活动支座阻尼间隙 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]