考虑速度脉冲型地震动的实际高层隔震结构地震响应研究

Study on Seismic Response of High-rise Shear Wall Isolated Building Considering Velocity Pulse Ground Motion

针对昆明市某99.7 m高层剪力墙隔震建筑,使用90组非脉冲与速度脉冲型地震时程,按震中距及有效持时分别分为7类与6类后,对其结构进行中震及大震作用下的快速非线性分析。结果表明:(1)中震时,该结构非脉冲层间剪力与倾覆力矩均小于脉冲数值,且其比例随楼层增加而增大;(2)大震时,速度脉冲对支座应力及位移的平均放大效应可达1.23~2.44倍,同时时程震中距为(50 km,70km],或有效持时为(40 s,50 s]时支座受脉冲作用放大效应影响最大;(3)结构边缘的橡胶隔震支座拉应力、压应力、天然橡胶支座水平剪切力等受脉冲作用的影响更为明显。

90 groups of non-pulse and pulse ground motions are divided into 7 and 6 categories according to epicenter distance and effective duration respectively,then input to a 99.7 m high-rise shear wall isolation building in Kunming for fast nonlinear analysis.The results show that:(1)Under the condition of fortification earthquake,the non-pulse inter-story shear force and overturning moment of the structure are less than the pulse values,and the proportion increases as the floor increases.(2)The average amplification effect of velocity pulse ground motions of isolation bearing is about 1.23~2.44 under rare earthquake.When the epicenter distance is(50 km,70 km] or the effective duration is(40 s,50 s],the effect of velocity pulse is the most significant.(3)The tensile and compressive stress of the rubber bearings at the edge of the structure,and the horizontal shear force of natural rubber bearings are more obviously affected by velocity pulse.