某平面不规则大底盘多塔楼隔震结构的抗震性能分析

Seismic behavior analysis of a planar irregular enlarged-based multi-tower isolation structure

对8度区某平面不规则大底盘多塔楼基础隔震结构进行了抗震性能分析。根据结构特点采用多串质点系计算模型,利用时程分析法计算对比了隔震结构和非隔震结构在多遇地震作用下的水平剪力,并验算了隔震结构在罕遇地震作用下的水平剪力、层间位移和位移角。分析表明,在水平地震作用下隔震结构相对非隔震结构表现出了良好的减震效果,罕遇地震作用下隔震结构各项指标均满足规范要求。

Seismic analysis of a planar irregular base isolated, multi-tower building having an enlarged foundation base was carried out with respect to a Intensity 8 earthquake. According to the structural characteristics, a multi- mass series model was adopted. Time history analysis method was used to calculate and contrast horizontal shear force between isolated structure and non-isolated structure under action of frequently occurred earthquake, and check horizontal shear force, interstorey drift and drift angle of isolated structure under action of seldom occurred earthquake. The results show that the base isolated structure performs better than base non-isolated structure and has a good seismic reduction effect. Under the rarely occurring earthquake, the targets for the base-isolated structure meet the code＇ s specifications.