考虑轨道约束的连续梁拱桥地震反应及减震控制研究  

Seismic response and control study of continuous beam arch bridges under track constraint

作　　者：石岩[1] 赵翔宇 焦应乾 刘云帅[1] 张胶玲 SHI Yan;ZHAO Xiangyu;JIAO Yingqian;LIU Yunshuai;ZHANG Jiaoling(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《世界地震工程》2022年第1期148-157,共10页World Earthquake Engineering

基　　金：国家自然科学基金项目(51908265);红柳优秀青年人才资助计划(04-061810)。

摘　　要：以一座大跨度单线铁路连续梁拱桥为背景,建立了考虑轨道约束和相邻构件碰撞效应的动力分析模型;通过输入40组水平双向地震动记录进行非线性时程分析,探究轨道约束和拱肋对桥梁地震响应的影响,采用“减震榫-拉索限位器”与“自恢复耗能支撑(SCEDB)-屈曲约束支撑(BRB)”控制水平向地震反应,并对比两种组合减震控制系统的减震效果,研究了耗能支撑布置角度对主梁位移响应的影响。结果表明:考虑轨道约束减小了主梁的位移响应;支撑总强度相等的情况下,“SCEDBBRB”较之于“减震榫-拉索限位器”的减震效果更佳;当支撑布置角度在40°~45°时,主梁位移较小,残余位移得到有效控制,结构可基本实现自复位。Taking a single track railway long span continuous beam arch bridge as the prototype structure,a dynamic analysis model considering the track constraint and pounding effect was established.To investigate the influence of track constraint and arch rib on the seismic response of bridge,40 sets of bidirectional horizontal ground motion records were selected to conduct the nonlinear time history analysis.Two strategies were used to control the horizontal seismic response,one was the combination of steel energy absorber and cable restrainer(SEA-CR),the other was the combination of self-centering energy dissipation braces and bucking-restrained brace(SCEDB-BRB).Anti-vibration effect of the two vibration control systems was compared.Then,effect of layout of braces on displacement of girder was studied.Results indicate that the track constraint will reduce the displacement response of the girder.SCEDB-BRB has better damping effect than SEA-CR.The bridge is able to achieve self centering target when layout angle of braces ranges from 40°to 45°,the peak and residual displacement of girder can be controlled effectively.

关 键 词：连续梁拱桥 轨道约束 减隔震 地震反应 自复位性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]