基于摩擦摆支座的高速铁路简支梁桥减隔震效果分析  

Analysis of vibration isolation effect of friction pendulum bearings on simple-supported girder bridges for high-speed railroad

作　　者：朱海龙 张永亮[1] 周友权[2] 刘海涛 Zhu Hai-long;Zhang Yong-liang;Zhou You-quan;Liu Hai-tao(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway First Survey and Design Institute Group Co.Ltd,Xi'an 710043,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁第一勘察设计院集团有限公司,陕西西安710043

出　　处：《工程抗震与加固改造》2024年第1期69-76,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(52168018);中铁第一勘察设计院集团有限公司项目(院科20-33)。

摘　　要：为研究摩擦摆支座在高速铁路简支箱梁桥的减隔震效果,以24、32、40m典型跨径高速铁路简支梁桥为研究对象,采用MIDAS/Civil有限元软件分别建立传统抗震体系和减隔震体系模型进行非线性动力时程分析,研究桥梁墩高、桥梁跨径和地震动峰值加速度(PGA)等因素对简支梁桥地震响应的影响。研究结果表明:桥墩墩高和截面形式对墩底内力和墩顶位移的减震效果有较大影响,但在5~20m墩高内受墩高的影响更为显著;墩高从5m增加到20m时,墩底内力减震率分别为80%、35%,墩高从25m增加到45m时,墩底内力减震率分别为46%、37%;桥梁跨径对结构减震率有一定影响,但在10%以内;PGA对墩底内力和墩顶位移的减震率总体上影响较小;墩高和PGA对FPB支座位移影响较大,PGA影响更为显著,支座位移增大倍数明显大于对应的PGA增加倍数。In order to study the seismic isolation effect of friction pendulum bearings on simple-supported box girder bridges of highspeed railway,the simple-supported box girder bridges of 24 m,32 m and 40 m typical spans of high-speed railway are taken as the research objects.MIDAS/Civil finite element software was used to establish the models of traditional seismic system and seismic isolation system for nonlinear dynamic time-history analysis.The influence of bridge pier height,bridge span and peak ground motion acceleration(PGA)on the seismic response of simple-supported box girder bridges was studied.The results show that the pier height and cross-section form have a great influence on the damping rate of the internal force at the bottom of the pier and the displacement at the top of the pier,and the influence of the pier height is more obvious.The height of bridge pier and peak ground motion acceleration(PGA)have great influence on the displacement of FPB bearing,and the influence of PGA change is more obvious.The maximum influence of bridge span on damping ratio is 9%in pier height(5~20 m),but the overall variation of damping ratio is not changed.The influence of peak ground motion acceleration(PGA)on damping ratio is 1%~6%when the pier height is 5~45 m.Setting reasonable pier stiffness and section form for high-speed railway bridge can improve the damping effect of pier bottom internal force and pier top displacement.

关 键 词：高速铁路 简支梁桥 摩擦摆支座 减隔震效果 影响因素 

分 类 号：U442[建筑科学—桥梁与隧道工程]