装配式斜支撑节点钢框架的静力弹塑性分析

PUSHOVER ANALYSIS OF PREFABRICATED STEEL FRAME STRUCTURE WITH INCLINED SUPPORT JOINTS

为研究新型结构装配式斜支撑节点钢框架的抗震性能,采用Pushover分析方法对其进行罕遇地震作用下的弹塑性分析,并与无斜撑钢框架结构进行对比。计算结果表明：7度罕遇地震作用下,装配式斜支撑节点钢框架最大层间位移角为1/223,小于GB 50011—2010《建筑抗震设计规范》限值1/50,满足＂大震不倒＂的抗震设防目标。斜支撑的布置减小了结构在罕遇地震作用下的变形,其中结构顶点位移减小33.4%~38.1%,结构最大层间位移角减小19.3%~40.1%,塑性铰大部分出现在桁架梁腹杆部位,框架柱处于弹性阶段。

For studying the aseismic performance of the prefabricated steel frame with inclined support joints, the Pushover analysis was applied on one 30-story prefabricated steel frame and compared with analysis results of the frame without inclined support.Analysis result showed that under 7-degree rare earthquake, the maximum drift was 1/223, which was less than 1/50 specified by the code, hence this building structure could meet the principle of‘no collapse under seldom earthquake action’ in the national seismic design code; the arrangement of inclined support could reduce the deformation of the structure under severe earthquake, and the top displacement and the maximum drift of the structure were reduced by 33.4%-38.1% and 19.3%-40.1% respectively.Most of plastic hinges occurred on positions of web members of the truss girder, and frame columns were in elastic stage.