减隔震混合装置对大跨度斜拉桥地震响应的影响  

Effects of hybrid seismic isolation device on seismic response of long-span cable-stayed bridge

作　　者：贾毅[1] 赵人达[1] 李福海[1,2] 廖平 许智强[1] JIA Yi;ZHAO Ren-da;LI Fu-hai;LIAO Ping;XU Zhi-qiang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;National Engineering Laboratory for Technology of Geological Disaster Prevention in Land Transportation,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Putian University,Putian 351100,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学陆地交通地质灾害防治技术国家工程实验室,成都610031 [3]莆田学院土木工程学院,福建莆田351100

出　　处：《吉林大学学报（工学版）》2020年第4期1411-1418,共8页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家重点研发计划项目(2016YFB1200401);国家自然科学基金项目(51308471);广东省交通厅科技计划项目(2014-02-015)。

摘　　要：为研究减隔震混合装置对大跨度斜拉桥的减震限位效果,以一座(67+110+360+110+67)m的大跨斜拉桥为研究对象,采用ANSYS有限元软件建立了全桥动力分析模型,基于非线性时程分析法研究了采用摩擦摆支座和液体粘滞阻尼器的减隔震混合装置对大跨度斜拉桥抗震性能的影响,并通过参数分析确定了较为合理的减隔震装置参数。研究结果表明:主桥纵桥向布置减隔震混合装置可以有效解决大跨斜拉桥的抗震问题;相比单独采用液体粘滞阻尼器,减隔震混合装置改善了桥塔和过渡墩的受力,进一步减小了主梁及塔顶的位移;综合考虑结构的地震响应和工程造价,该桥减隔震混合装置中阻尼指数α取0.4,阻尼系数C取12000 kN/(m·s-1)0.4时可以取得较好的减震效果;减隔震混合装置中摩擦摆支座和液体粘滞阻尼器可以协同作用,减震耗能明显。A long-span cable-stayed bridge with a span(67+110+360+110+67)m is selected to study the effect of hybrid seismic isolation device on the shock absorption limit. The spatial dynamic model was established by finite element software ANSYS,and the effects of hybrid seismic isolation device with friction pendulum bearing and fluid viscous damper on the seismic response of the bridge structure were studied based on the nonlinear time history analysis method. Then,the parameters of the isolation device were obtained by parameter analysis. The research results show that it is possible to resolve the seismic problem of long-span cable-stayed bridge by arranging hybrid seismic isolation device in the longitudinal direction of the main bridge. In comparison to use fluid viscous damper alone,the hybrid seismic isolation device further reduces the internal forces of pylons and transition piers and further reduces the displacements of pylon and girder. Considering the seismic response of the structure,hybrid seismic isolation device of the bridge with the damping index of 0.4 and the damping coefficient of 12 000 kN/(m·s-1)0.4 can achieve a better shock absorption effect. Besides,friction pendulum bearing and fluid viscous damper in hybrid seismic isolation device can work together and achieve significant effect of energy absorption.

关 键 词：桥梁工程 斜拉桥 减隔震混合装置 非线性时程分析法 液体粘滞阻尼器 摩擦摆支座 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]