支座布置对不等高墩曲线桥梁抗震性能的影响分析  

Influences of bearing arrangement on seismic performance of curve bridge with unequal height piers

作　　者：吴文朋[1] 彭巧威 龙士国 张凤涛 王月 WU Wenpeng;PENG Qiaowei;LONG Shiguo;ZHANG Fengtao;WANG Yue(College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China;China Railway Design Corporation,Tianjin 300251,China;Tianjin Highway Engineering General Company,Tianjin 300201,China)

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]中国铁路设计集团有限公司,天津300251 [3]天津市公路工程总公司,天津300201

出　　处：《地震工程与工程振动》2019年第4期227-235,共9页Earthquake Engineering and Engineering Dynamics

基　　金：湖南省科技重大专项(2017SK1010);国家自然科学基金项目(51708477);中国博士后科学基金项目(2018M640756);湖南省教育厅科研项目(18C0099)~~

摘　　要：为探讨支座布置形式对山区不等高墩曲线梁桥地震响应的影响,以一座5跨连续曲线梁桥为例,建立了桥梁的OpenSEES有限元模型,拟定了12种不同的支座布置形式,分别输入7条远场地震波进行非线性时程分析,对支座和墩柱的地震响应以及损伤进行比较分析。分析结果表明:不等高墩曲线桥的低墩宜采用板式橡胶支座或活动支座,并设置横向挡块来限制主梁过大的横向位移;高墩可采用铅芯橡胶支座或固定支座;由于弯-扭耦合作用以及地震波输入方向效应的影响,支座布置形式对桥墩损伤的影响规律与直线桥类似但不完全一致;曲线桥梁支座的切向相对变形与墩台的侧向刚度有较大关系,而支座径向相对变形不仅对支座布置形式较敏感,还与地震波的输入方向以及曲线桥的不规则性相关;曲线桥梁上部结构在桥台主动方向的切向变形量比直线桥梁大得多,更易发生落梁破坏,因此桥台处更适用采用限位能力较好的铅芯橡胶支座。In order to investigate the influence of bearing arrangement on seismic performance of the curve girder bridges with unequal height piers in mountain areas,a five span concrete continuous curved girder was taken as an example and the OpenSEES software was used to establish the finite element model of the bridge.Twelve different kinds of bearing arrangement were adopted for analysis and seven far-fault ground motions were used for nonlinear time-history analysis,respectively.The seismic response and damage status ofthe bearings and pierswere compared and analyzed.It is conclude that,the plate-type elastomeric bearing or sliding bearing should be used at the lower piers of the curve bridges.Meanwhile,the transverse retainers should be designed to limit the excessive lateral girder displacement.The lead rubber bearingor the rigid bearing can be used at the higher piers.Due to the effect of bending-torsional coupling and the input direction of seismic waves,the influence of bearing arrangement on pier damage is similar to but not completely consistent with that of straight bridge.The tangential relative deformation response of bearings is closely related to the lateral stiffness of piersor abutments.The radial relative deformation of bearing is not only sensitive to the form of bearing arrangement,but also closely related to the input direction of ground motions and the irregularity of the curved bridges.The tangential deformation of the curved bridge superstructure in the active direction of the abutment is much larger than that of the straight bridge,which will lead to girder fall failure easier.Therefore,thelead rubber bearing with better constraint capability is more suitable for the bearing arrangement at the abutment.

关 键 词：支座布置 抗震性能 曲线桥梁 不等高桥墩 地震 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]