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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。
Buckling restraint brace is a new type of energy brace. The installation of BRB frame structure can reduce the design of reinforcement and increase the lateral stiffness of the structure, so whether the seismic fortification requirements of “large earthquake” problem. In this paper, the finite element simulation method is used to compare and analyze the seismic performance of BRB-and-BRB-less concrete frame structures under rare earthquakes and rare earthquakes. The results show that the structure deformation and structural energy dissipation under rare earthquakes . The seismic design of a 5-story frame structure with 8-degree seismic fortification is selected and the elasto-plastic analysis of rare earthquakes and rare earthquakes is carried out. The results show that the displacement angle of the frame structure meets the standard limit requirements under the rare earthquakes. However, Extremely rare earthquake action under the drift angle between the layers is greater than 1/50. The displacement angles of the BRB frame structure are less than 1/50 under rare and extremely rare earthquakes, and the displacement angle of the BRB frame structure is significantly smaller than that of the frame structure. The hysteresis curve of the BRB frame structure is more full, which shows that the BRB structure energy dissipation Relatively good ability.