弹塑性钢减隔震支座在桥梁抗震设计中的应用  

Application of Elasto-Plastic Steel Seismic Isolators to Bridge Anti-Seismic Design

作　　者：高山[1,2,3] 彭泽友[1,2,3] 史春娟[1,2,3] 王永祥[1,2,3] 

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710075 [2]西安中交土木科技有限公司,陕西西安710075 [3]西安市桥梁安全技术及装备工程实验室,陕西西安710075

出　　处：《世界桥梁》2015年第5期44-48,共5页World Bridges

基　　金：交通运输部科技项目(2011-318-495-580);陕西省重点科技创新团队计划(2013KCT-20);陕西省自然科学基础研究计划重点项目(2013JZ017);陕西省科学技术研究发展计划工业攻关项目(2012GY2-24)

摘　　要：为了给桥梁抗震设计提供参考,以减轻桥梁结构在地震中遭受的损伤,介绍一种弹塑性钢减隔震支座(NDQZ)的结构特点及其减隔震原理,并以(83+140+83)m双塔双索面预应力混凝土斜拉桥为实例进行减隔震分析。采用有限元分析软件SAP2000建立全桥有限元模型,在E2地震状态下分别进行非减隔震支座桥梁和NDQZ支座桥梁地震动力时程分析。结果表明:NDQZ支座可实现全桥协同抗震,减隔震效果良好;采用NDQZ支座后,桥梁前3阶自振周期平均延长133%,在顺桥向和横桥向墩底弯矩分别减小了40%和83%,墩底剪力分别减小了39%和70%;承台底弯矩分别减小了39%和74%,承台底剪力分别减小了34%和60%;弯矩和剪力分布均匀。To provide reference for bridge anti-seismic design and reduce the damage that bridge suffers in earthquakes,the structural features and principles of vibration mitigation and isolation of a kind of elasto-plastic steel seismic isolators（NDQZ）is introduced.A two-pylon prestressed concrete cable-stayed bridge with span arrangement of（83＋140＋83）m and with double cable planes is cited as an example to conduct vibration mitigation and isolation analysis.The finite element software SAP2000 was used to establish the finite element model of the whole bridge,to carry out time-history analysis of the bridge with bearings incapable of vibration mitigation and isolation effect and the bridge with NDQZ under the E2 earthquake condition respectively.The results of the analysis indicate that the NDQZ bearings can realize the effect of the whole-bridge collaborative vibration resistance,displaying sound vibration mitigation and isolation effect.When the NDQZ bearings are used,the first three orders of bridge natural vibration period averagely extends 133%.The bending moments in the base of the piers along the bridge length and width reduce 40% and 83%respectively,and the shearing force reduce 39% and 70%,respectively.The bending moments in the base of the pile caps reduce 39% and 74%,respectively and the shearing force reduce 34% and 60%,respectively.The bending moment and shearing force are uniformly distributed.

关 键 词：桥梁 抗震设计 减隔震支座 动力时程分析 弯矩 剪力 

分 类 号：U443.36[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]