多维多点激励下考虑支座摩擦滑移及结构碰撞的非规则桥梁抗震性能研究  

Seismic behavior of irregular bridges under multi-dimensional and multi-point excitation considering friction slip of bearings and structural pounding

作　　者：闫磊 李青宁[2] 岳克锋 李鲁平 付亚男[1] 蓝仕成 喻国根 YAN Lei;LI Qingning;YUE Kefeng;LI Luping;FU Yanan;LAN Shicheng;YU Guogen(School of Civil Engineering,Chongqing Three Gorges University,Chongqing 404100,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)

机构地区：[1]重庆三峡学院土木工程学院,重庆万州404100 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《世界地震工程》2019年第2期68-77,共10页World Earthquake Engineering

基　　金：国家自然科学基金(51508453);重庆市科委研究项目(cstc2018jscx-msyb0517,cstc2018jcyjAX0360);重庆市教委科学技术研究项目(KJQN201801223,KJ1601028);重庆高校创新团队建设计划项目(No.CXTDX201601034);三峡水库岸坡与工程结构灾变防控工程技术研究中心开放基金(SXAPGC18ZDI02、03,SXAPGC18YB02、05);重庆三峡学院三峡库区工程结构防灾减灾与安全创新团队项目、校级项目(17ZP08,17RC06,17ZZ03,18CGZH02);重庆市三峡水库生态环境保护和灾害防治协同创新中心、环江结构防灾减灾理论与关键技术创新群体资助项目

摘　　要：以一座典型山区非规则梁桥为研究对象,建立了该桥梁多维多点激励下的多自由度动力计算模型,研究了该桥梁在多维多点激励下考虑支座摩擦滑移及结构碰撞等非线性因素时的抗震性能。研究结果表明:相比一维地震输入,多维地震可使结构的动力响应增加,桥墩底部弯矩需求增大;相比一致激励,多点激励可使得支座的位移需求增大,且地震波最后到达的桥墩上方支座位移最大;同时考虑多点激励和碰撞效应可使桥墩的弯矩需求增加;水平地震作用下,矮墩上部的支座容易滑动,且双向地震较单向地震更明显,三向地震输入较双向有所增强。因此,对山区非规则梁桥进行抗震设计时应有针对性地进行多维多点地震输入计算,找出结构的最大地震需求,以期指导设计。The seismic performance of a typical irregular beam bridge in mountainous areas was studied in this paper.the multiple degree of freedom dynamic calculation model of the bridge under multi-dimensional and multi-point excitation was established,and the seismic performance of the bridge under multi-dimensional and multi-point excitation considering the non-linear factors such as bearing friction,slip and structural collision was studied.The results show that when compares with the one-dimensional seismic excitation,the multi-dimensional seismic excitation can increase the dynamic response of structures and increase the demand for bending moment at the bottom of piers.Compared with the uniform excitation,the time-delay effect of seismic wave can increase the displacement demand of the rubber bearings,and the displacement of the rubber bearings above the pier where the seismic wave finally arrives is the largest.Considering the time-delay effect of seismic wave and the pounding effect,the demand for bending moment of pier increases.The bearing on the short pier is easy to slip under the excitation of one-directional horizontal earthquake input,the two-directional horizontal earthquake input is more obvious than that of the one-directional earthquake,and the three-directional earthquake input is stronger than that of the two-directional earthquake.Therefore,the seismic design of irregular beam bridges in mountainous areas should be carried out with multi-dimensional and multi-point seismic input in order to find out the maximum seismic demand of the structure for rational design.

关 键 词：多维多点激励 非规则桥梁 摩擦滑移 结构碰撞 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]