云南昆明博物馆新馆基础隔震结构楼层谱分析

摘要

云南昆明博物馆新馆位于高烈度区,采用铅芯叠层橡胶隔震支座及普通叠层橡胶隔震支座组合基础隔震体系.由于结构内部附属结构物在大震甚至中小震作用下可能发生损坏,造成巨大损失,为此,采用楼层反应谱来分析附属结构物在地震作用下的反应和抗震性能.通过建立主结构分别为基础隔震与基础固定的三维有限元模型,应用基于加速度时程输入的时程分析法,输入一条正弦波及典型地震波,建立楼层反应谱,对基础隔震结构与基础固定结构的楼层反应谱进行了对比分析,并就地震烈度、附属结构所处楼层位置以及附属结构物阻尼比对楼层反应谱的影响进行了分析.结果表明,采用基础隔震技术能够有效降低附属结构物的反应,地震烈度、所处楼层位置以及附属结构物阻尼都对附属结构物的反应有不同程度的影响.%Kunming museum new house, which is located in high seismic fortification intensity region, is base isolated with both lead rubber bearings ( LRB) and rubber bearings (RB). Secondary systems in the primary structure may be damaged and suffer heavy losses under rare earthquake or even moderate and frequent earthquake. Floor response spectrum is usually used to evaluate the response and seismic performance under the seismic input. The three-dimensional finite element models of both the base-isolated and fixed-base structures are simulated. Based on time history method considering a sine wave and a seismic wave acceleration input,floor response spectrums are obtained, and the comparative analysis are implemented. The influences of seismic intensity, elevation locations of secondary systems and damping ratio for the floor response spectrum are studied. It is concluded that base-isolation could effectively drop the response of the secodary systems, and seismic intensity, elevation locations of secondary systems and damping ratio could influence the response of secondary systems,to some extent.