近断层速度脉冲型地震动作用基础隔震建筑位移反应分析  

Displacement Response Analysis of Base-isolated Buildings Subjected to Near-fault Ground Motions with Velocity Pulse

作　　者：贺秋梅[1] 李小军[1,2] 杨宇[3] 

机构地区：[1]中国地震局地球物理研究所,北京100081 [2]北京工业大学建筑工程学院,北京100022 [3]环境保护部核与辐射安全中心,北京100082

出　　处：《应用基础与工程科学学报》2014年第1期1-13,共13页Journal of Basic Science and Engineering

基　　金：国家重点基础研究发展计划(2011CB013601);国家科技重大专项(2011ZX06002-010-15);中央级公益性科研院所基本科研业务专项(DQJBDB28)

摘　　要：以4层、9层和14层3个基础隔震结构为计算模型,选取了3条向前方向性效应速度脉冲及3条滑冲效应速度脉冲地震动记录,并以这些速度脉冲型地震动的弹性反应谱作为目标谱分别合成6条无速度脉冲的地震动时程样本,对比分析了在有、无速度脉冲的地震动激励下基础隔震结构的位移反应.探讨了地震动的速度脉冲对基础隔震结构位移反应的影响,并详细分析了两类不同产生机制的速度脉冲对基础隔震建筑结构地震位移反应的影响差异.研究结果表明,速度脉冲使基础隔震结构位移反应明显增大,对于中低层基础隔震建筑的位移反应滑冲效应速度脉冲的影响更大一些,而向前方向性速度脉冲对高层建筑位移反应影响更大,滑冲效应速度脉冲使得结构底部变形更大,导致结构可能发生底层倒塌破坏.In order to study the influence of the velocity pulse to seismic displacement response of base-isolated buildings and the differences of the influent of the two types of near-fault ground motions with velocity pulse to seismic response of base-isolated buildings, the seismic responses were analyzed by three dimensional finite element models for three base-isolated buildings, 4 stories,9 stories and 14 stories. In this study,comparative analyses were done for the seismic displacement responses of the base-isolated structures under 6 near-fault ground motion records with velocity pulse and no velocity pulse, in which ,6 artificial ground motion time histories with same elastic response spectrum as the 6 near-fault ground motion records were used as the ground motion with no velocity pulse. This study indicates that under the ground motions with velocity pulse the seismic displacement response of base-isolated buildings is significantly increased than the ground motions with no velocity pulse. To the median-low base-isolated buildings, the impact of forward directivity pulses is bigger than fling-step pulses. To the high base-isolated buildings, the impact of fling-step pulses is bigger than forward directivity pulses. The fling-step pulses lead to large displacement response in the lower stories.

关 键 词：近断层 速度脉冲 地震动记录 基础隔震建筑 位移反应 

分 类 号：TU352.1[建筑科学—结构工程]