隔震支座布置对地铁上盖多塔楼隔震结构的抗震性能影响分析  

Analysis of Impact of Arrangement of Isolation Bearing on Seismic Behavior of Isolated Multi-Tower Structures with Large Base on Subway

作　　者：张永强 ZHANG Yongqiang(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《结构工程师》2024年第2期91-100,共10页Structural Engineers

基　　金：中铁第一勘察设计院集团有限公司科技创新项目(19-59)。

摘　　要：隔震支座的布置方式影响整隔震层的刚度,从而影响隔震效果。基于铅芯橡胶支座刚度占比和偏心率,确定了隔震支座的布置方式,研究了不同隔震支座布置方式对地铁上盖多塔楼隔震结构地震响应的影响。研究了隔震结构的减震系数、楼层加速度、层间位移角、楼层位移和楼层剪力的变化规律。研究结果表明,铅芯橡胶支座刚度占比在一定范围内变化,对于隔震层及盖上结构,减震系数增大,楼层加速度、楼层位移、层间位移角和楼层剪力减小;对于盖下结构,减震系数和楼层剪力增大,楼层加速度和层间位移角减小,楼层位移几乎不变;偏心率在一定范围内变化,对于隔震层及盖上结构,减震系数和楼层加速度增大,楼层位移、层间位移角和楼层剪力减小;对于盖下结构,减震系数增大,层间位移角和楼层剪力减小;楼层加速度和楼层位移几乎没有变化。The stiffness distribution of the isolation story and the isolation effect are badly influenced by arrangement of isolation bearings.Based on the stiffness ratio and eccentricity ratio of the lead rubber bearing,the arrangement of the isolation bearing was determined.The effect of different arrangement of the isolation bearing on the seismic response of the isolated multi-tower structures with large base on the subway was studied.The variation law of seismic decrease coefficient,floor acceleration,inter-story drift,floor displacement and floor shear of isolated structure was studied.The results showed that when stiffness ratio of the lead rubber bearing varied within a certain range,the seismic decrease coefficient of isolation story and superstructure increased,the floor acceleration,floor displacement,inter-story drift and floor shear of isolation story and superstructure decreased.For the substructure,the seismic decrease coefficient and floor shear increased,while the floor acceleration and inter-story drift decreased,and the floor displacement was almost constant.When eccentricity changed within a certain range,the seismic decrease coefficient and floor acceleration of isolation story and superstructure increased,while the floor displacement,inter-story drift and floor shear of isolation story and superstructure decreased.For the substructure,the damping coefficient increased,the inter-story drift and floor shear decreased.Floor acceleration and floor displacement were almost constant.

关 键 词：地铁上盖开发 多塔楼结构 隔震结构 铅芯橡胶支座刚度比 偏心率 

分 类 号：TU352.1[建筑科学—结构工程] U231[交通运输工程—道路与铁道工程]