非周边约束地下室对结构抗震性能影响分析

Analysis on influence of non-peripheral confined basement on seismic performance of structure

嵌固部位的确定对于多高层建筑结构计算至关重要,我国现行规范通过楼层等效剪切刚度比判断地下室顶板是否可作为上部结构的嵌固部位,主要适用于地下室周边约束的情况。本文以某高层建筑为背景,针对两面开敞的非周边约束的地下室,采用多个有限元分析软件,对结构进行了多遇地震、设防烈度地震和罕遇地震作用下的反应谱法与时程法计算分析,考察了不同水准地震作用下结构的基底剪力、层间位移角与耗能机制等抗震性能。根据地下室顶板上、下结构侧向刚度比和构件塑性发展程度进行判断,对于两面开敞的非周边约束地下室,地下室顶板可以作为上部结构的嵌固端。

The determination of the embedded parts is crucial for the calculation of multi-high-rise building structures.The current code in China determines whether the basement roof can be used as the embedded part of the superstructure through the equivalent shear stiffness ratio of the floor,which is mainly applicable to the surrounding constraints of the basement.In this paper,based on a high-rise building,the response spectrum method and time history method are used to calculate and analyze the structure under frequent earthquake,fortification intensity earthquake and rare earthquake with multiple finite element analysis software for two open non-peripheral confined basements.The seismic performance of the structure such as base shear,story drift angle and energy dissipation mechanism under different levels of earthquake are investigated.According to the lateral stiffness ratio of the upper and lower structures of the basement roof and the plastic development degree of the components,the basement roof can be used as the embedded end of the upper structure for the two open non-periphery constrained basements.