强震区中小跨径连续梁桥减隔震支座方案比选  

Comparison and Selection of Seismic Mitigation and Isolation Bearing Schemes for Small and Medium Span Continuous Beam Bridges in Strong Earthquake Area

作　　者：林智敏 庄卫林[2] LIN Zhimin;ZHUANG Weilin(School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]成都大学建筑与土木工程学院,四川成都610106 [2]西南交通大学土木工程学院,四川成都611756

出　　处：《成都大学学报(自然科学版)》2025年第1期87-93,共7页Journal of Chengdu University(Natural Science Edition)

基　　金：高速铁路轨道技术国家重点实验室开放基金项目(2022YJ121-1)。

摘　　要：以某强震区中小跨径连续梁桥为对象,首先分析了采用摩擦摆支座、高阻尼橡胶支座和板式橡胶支座的连续梁桥的动力特性,进而通过全桥动力非线性时程分析,对比了板式橡胶支座、高阻尼橡胶支座和摩擦摆支座的梁端位移响应及墩底、桩基内力响应,探讨了3种支座方案对中小跨径连续梁桥减震性能的影响.结果表明,采用板式橡胶支座、高阻尼橡胶支座和摩擦摆支座的强震区中小跨径连续梁桥,横向地震作用下,桥墩和桩基地震响应差别不大,相对于板式橡胶支座和摩擦摆支座,高阻尼橡胶支座方案梁体横向位移相对较小;纵向地震作用下,板式橡胶支座和高阻尼橡胶支座梁体位移、桥墩和桩基内力响应基本一致,相对于摩擦摆支座,板式橡胶支座和高阻尼橡胶支座方案梁体纵向位移的减震率达到70%,对桥墩内力的减震率在12%~43%之间,可大幅减小纵向地震对桥梁下部结构影响.Taking the small and medium span continuous beam bridge in a strong earthquake area as the object,the dynamic characteristics of the continuous beam bridge with friction pendulum bearing,high damping rubber bearing and elastic pad bearing are analyzed firstly.Then,through the dynamic nonlinear time history analysis of the whole bridge,the displacement response of the beam end and the internal force response of the pier bottom of the elastic pad bearing,high damping rubber bearing and friction pendulum bearing are compared,and the influence of the three bearing schemes on the damping performance of the middle and lower span continuous girder bridge is discussed.The results show that the seismic response of pier and pile foundation of small and medium span continuous beam bridge in strong earthquake area with elastic pad bearing,high damping rubber bearing and friction pendulum bearing is not much different under the response in transverse earthquake action.Compared with elastic pad bearing and friction pendulum bearing,the transverse displacement of high damping rubber bearing is relatively small.Under the action of longitudinal earthquake,the displacement of beam body,the internal force response of pier and pile foundation of elastic pad bearing and high damping rubber bearing are basically the same.Compared with friction pendulum bearing,the damping rate of longitudinal displacement of beam body of elastic pad bearing and high damping rubber bearing scheme reaches 70 %,and the damping rate of internal force of pier is about 12%~43%,which greatly reduces the influence of longitudinal earthquake on the substructure of the bridge.

关 键 词：强震区 连续梁桥 减隔震设计 地震响应 减震率 

分 类 号：U422.55[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]