砂砾石垫层厚度对上部结构地震反应的影响  

Seismic responses of sand-gravel cushion in different thickness

作　　者：郜艳轲 张新中[2] 唐克东[2] 白哲[1] 

机构地区：[1]河南城建学院土木工程学院,河南平顶山467036 [2]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《河南城建学院学报》2016年第4期26-30,共5页Journal of Henan University of Urban Construction

基　　金：河南省高等学校重点科研项目(15B440001)

摘　　要：由于砂砾石垫层具有较低的剪切刚度,在地震作用下可降低结构振动的基本频率,延长结构的基本周期,避开地震动的主要能量频带,从而阻断地震能量向上部结构的传递,对上部结构起到了减震作用。建立以砂砾石垫层为隔振元件的计算模型,对计算模型进行了模态分析和动力时程分析,得出当结构物铺设的砂砾石垫层厚度越大时,基底滑移量也越大,同时结构顶部相对位移越小,即上部结构作为整体"平移"的效果越明显,隔震效果越理想。Sand-gravel cushion has lower shear stiffness,which can reduce the fundamental frequency under the action of earthquake effect and prolong the fundamental period to keep the structure away from the main frequency band of the earthquake which carries the most energy,and in this way,the earthquake energy that transfers into the superstructure can be reduced. To study the impact the sand-gravel cushion may exert on seismic response of constructions on it,this paper established a reinforced concrete frame structure model on the sand-gravel cushion,then analysis the structure＇s vibration mode and dynamic time- history. As a result of analysis,the thicker the cushion is,the larger the base sliding displacement,and the smaller relative displacement of the top structure,and the more obvious＂horizontal movement＂effect of the structure,it proved that base isolation system worked very well.

关 键 词：砂砾石垫层 厚度 地震反应 时程分析 

分 类 号：TU352.1[建筑科学—结构工程]