基于SHDR支座的异形斜交梁桥减隔震分析  

Seismic Isolation Analysis of the Special-shaped Skew Girder Bridge Based on Super High Damping Rubber Bearings

作　　者：曹锋[1] 马鹏 靳威燕 CAO Feng;MA Peng;JIN Weiyan(School of Civil and Transportation Engineering,Qinghai Nationalities University, Xining Qinghai 810007,China;China. CSCEC AECOM Consultants Co., Ltd., Lanzhou Gansu 730000,China)

机构地区：[1]青海民族大学土木与交通工程学院,青海西宁810007 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《佳木斯大学学报（自然科学版）》2021年第1期17-21,44,共6页Journal of Jiamusi University：Natural Science Edition

基　　金：青海民族大学校级规划一般项目(2020XJGH07)。

摘　　要：随着城市桥梁的发展,城市立交匝道上异形斜交梁大量增加,由此引起高烈度地区异形斜交连续梁桥减隔震问题日益突出。本文以甘肃(天水)国际陆港城陆港大道第一联(30+28.5)m异形斜交连续梁桥为实际工程背景,采用有限元分析软件Midas Civil—2019建立桥梁空间三维抗震模型,采用反应谱及非线性时程分析方法,对普通橡胶支座和SHDR支座的地震反应的影响分别进行分析,研究在纵向及横向地震作用下1#固定墩和2#活动墩墩顶左右支座位移及内力的变化规律。结果表明:SHDR支座对该异形斜交连续梁具有很好的减隔震作用,采用SHDR支座能增加桥梁结构前三阶振型的自振周期,避开地震动卓越周期;与普通支座相比,采用SHDR支座后,活动墩分担了较大的地震力,固定墩墩底弯矩和墩顶位移反应显著减小,使结构处于弹性受力状态,以满足抗震设防目标。With the development of urban bridges,the special-shaped skew beams on the urban interchange ramps have increased greatly,and there are not too many problems on the seismic isolation of special-shaped continuous beam bridges in high-intensity areas.This paper takes the first joint(30+28.5)m special-shaped oblique continuous beam bridge of Lugang Avenue in Gansu(Tianshui)International Land Port City as the actual engineering background.The finite element analysis software Midas Civil-2019 is used to establish a three-dimensional seismic model of the bridge space.Response spectrum and nonlinear time-history analysis methods analyze the effects of ordinary rubber bearings and SHDR bearings on the seismic response separately,and study the 1#fixed pier and 2#movable pier top left and right supports under longitudinal and lateral earthquakes The changing law of displacement and internal force.The results show that the use of SHDR bearings can increase the natural vibration period of the first three modes of the bridge structure and avoid the excellent period of ground motion;compared with ordinary bearings,after adopting SHDR bearings,the movable piers share a larger seismic force,The fixed pier bottom bending moment and pier top displacement response are significantly reduced,so that the structure is in a state of elastic stress to meet the seismic fortification goal.

关 键 词：异形斜交连续梁桥 SHDR支座 减隔震分析 有限元模型 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]