钢框架-中心支撑结构抗震设计

Seismic design of steel frame-center support structure

以某五层钢框架-中心支撑结构商业裙房为例,采用YJK、PMSAP两个不同力学模型的三维空间分析软件分别对小震及风荷载下结构的性能、中震下的性能进行整体内力和位移分析,采用弹性时程分析法进行了补充计算,并且采用PMSAP的Pushover模块进行罕遇地震下的静力弹塑性推覆性能分析,根据分析结果得出关键构件(钢桁架)抗震等级提高为三级,按中震弹性性能目标控制。根据罕遇地震作用下的动力弹塑性分析结果,对重要构件予以适当加强。

Taking for example the five-storey commercial skirt building of the steel frame-center support structure, two 3D spatial analysis software YJK and PMSAP of different mechanical models are adopted for the integral internal force and displacement analysis of structural performance under small quake, medium quake and wind load, supplementary calculations are made by using elastic time-history analysis method, and the Pushover module of PM- SAP is used for analysis of static elastic-plastic pushover performance under rare earth quake. Based on the analysis result, the seismic grade of key components is increased as level 3 and the target control is made as the elastic performance of medium quake. According to the analysis result of dynamic elastic-plastic under rare earthquake, the important components should be strengthened appropriately.