地铁上盖结构隔震效果研究  

STUDY ON THE ISOLATION EFFECT OF SUBWAY COVER STRUCTURES

作　　者：范重[1] 崔俊伟 薛浩淳 杨开[1] 高嵩[1] 王金金[1] 吴徽 FAN Zhong;CUI Jun-wei;XUE Hao-chun;YANG Kai;GAO Song;WANG Jin-jin;WU Hui(China Architecture Design&Research Institute,Beijing 100044,China;China IPPR International Engineering Co.,Ltd,Beijing 100089,China;School of Civil Engineering and Transportation,Beijing University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]中国建筑设计研究院,北京100044 [2]中国中元国际工程有限公司,北京100089 [3]北京建筑大学土木与交通工程学院,北京100044

出　　处：《工程力学》2021年第S01期77-88,共12页Engineering Mechanics

基　　金：国家重点研发计划项目(2017YFC0703600)。

摘　　要：为了深入研究地铁上盖结构隔震效果,建立了大底盘-多塔楼双自由简化模型,考察质量比和周期比对结构动力特性以及对塔楼和底盘地震作用的影响规律。采用ETABS软件建立了地铁上盖精细模型,研究塔楼高度、塔楼数量、隔震层刚度及粘滞阻尼器等对结构动力特性、塔楼和底盘减震效果的影响。双自由度简化模型分析结果表明,在隔震塔楼与大底盘常见的周期比范围内,塔楼的剪重比与塔楼质量关系不大,大底盘的剪重比随着塔楼质量增大略有减小。大底盘-多塔楼隔震结构精细模型分析结果表明,地震惯性力沿塔楼高度分布均匀,建筑高度对地震作用影响很小,大底盘的地震作用随塔楼高度增大总体上略有增大。随着塔楼数量增加,塔楼的减震效果略有下降,大底盘的地震作用小于非隔震结构。隔震层刚度增大时,塔楼地震作用增大,大底盘地震作用减小。隔震设置粘滞阻尼器后,地震力沿塔楼高度的分布规律发生明显改变,塔楼底部的地震作用减小,顶部的地震作用显著放大;设置粘滞阻尼器可以有效降低大底盘的地震作用。In order to study the seismic isolation effect of the subway superstructure comprehensively,a simplified two-degree-of-freedom model of the large base with multiple towers was presented,and the influences of mass ratio and period ratio on dynamic characteristics and seismic response of structures were investigated.In addition,a precise model of the subway superstructure was established by ETABS to study the effect of tower height,tower number,isolation floor stiffness,and viscous dampers on the structural dynamic characteristics,seismic isolation coefficient.The analysis results of the simplified two-degree-of-freedom model show that in the general period ratio range,the shear-weight ratio of the tower has almost no change with its mass variation,while the shear-weight ratio of the large base decreases when the tower mass increases.The analysis results of the precise model of the large base with multi-tower show that the seismic inertial force is evenly distributed along the height of the tower,and the building height has little effect on the earthquake action,and the seismic effect of the large base increases slightly as the height of the tower increases.As the number of towers increases,the seismic isolation effect of the tower decreases slightly,the seismic effect of the large base is less than that of non-seismic isolation structures.As the stiffness of the seismic isolation floor increases,the seismic effect of the tower increases and the seismic effect of the large base decreases.After viscous dampers are installed,the distribution of seismic force along the height of the tower changes significantly,the seismic action decreases at the bottom of the tower and the seismic action is significantly amplified at the top.Setting viscous dampers can effectively reduce the seismic action of the large base.

关 键 词：地铁上盖 层间隔震 简化模型 有限元分析 隔震效果 

分 类 号：TU352.12[建筑科学—结构工程]