摘要
屈曲约束支撑是一种新型的耗能支撑。安装屈曲约束支撑(BRB)的框架结构可以减少设计配筋,增加结构抗侧刚度,那么按多遇地震设计后能否满足"大震不倒"的抗震设防要求自然成为研究者关注的问题。本文采用有限元模拟的方法对比分析安装BRB和不安装BRB的混凝土框架结构在罕遇地震、极罕遇地震下的抗震性能,具体体现在结构在罕遇地震下的层间变形和结构耗能。选取某5层框架结构按8度抗震设防设计,并进行罕遇地震和极罕遇地震弹塑性分析,结果表明框架结构在罕遇地震作用下层间位移角还满足规范限值要求,但在极罕遇地震作用下层间位移角已大于1/50。BRB框架结构在罕遇、极罕遇地震作用下层间位移角均小于1/50,且相比框架结构层间位移角显著减小,结构的滞回曲线更加饱满,说明BRB结构的耗能能力相对较好。
BRB（Buckling Restrained Brace） is a new kind of energy-consumpting brace. The frame structure with BRB （hereinafter referred to as BRB frame）can reduce the design reinforcements, so it is a problem that deserves researchers＇ attention whether the seismic fortification requirements can meet the requirement of ＂No Collapsing in the Strong Earthquake＂. The numerical simulation method is used to analyze the seismic behavior of frames and BRB frames under rare earthquake and extremely rare earthquake. Seismic behavior is embodied in the structure of the inter story deformation and energy consumption. A five-story frame structure in 8 degree seismic fortification design is selected and the elastoplastic analysis under rare and extremely rare earthquake is carried out. The results show that the story drift of the frame structure under rare earthquake can meet the requirement of the standard limit, but in extremely rare earthquake, the story drift is larger than 1/50. The story drift of BRB frame structure under rare earthquake and extremely rare earthquake is less than 1/50, the story drift is significantly reduced comparing with the frame structure, and the hysteretic curve of the structure becomes fuller, which shows that the energy dissipation capacity of BRB frame is better.
出处
《建筑科学》
CSCD
北大核心
2017年第5期25-30,共6页
Building Science
