防屈曲支撑组合框架结构的概率抗震性能分析

Probabilistic seismic performance analysis of buckling-restrained braced composite frame structures

为了研究防屈曲支撑与钢管混凝土组合框架组成的新型高效抗震结构体系的抗震性能,利用有限元分析软件OpenSEES建立了防屈曲支撑钢管混凝土组合框架分析模型,建立防屈曲支撑钢管混凝土组合框架结构的整体抗震能力的极限状态方程,绘制结构在各种破坏状态下条件失效概率的结构概率抗震能力曲线,将防屈曲支撑钢骨混凝土组合框架结构的概率抗震能力曲线与组合框架结构进行对比,发现防屈曲支撑钢管混凝土组合框架结构的概率抗震能力曲线均在组合框架结构的概率抗震能力曲线的右方,表明防屈曲支撑钢管混凝土组合框架的抗震能力高于组合框架的抗震能力,新型防屈曲支撑能够与钢管混凝土协同作用,安装防屈曲支撑可显著提高组合框架结构的抗震性能,充分利用二者的耗能能力。

Combined the buckling-restrained brace with the concrete filled steel tube frame(BRB-CFSTF),which can be called as a new bucking-restrained braced composite frame structure.In order to consider the seismic performance of this structure,the analysis model of BRB-CFSTF is established by using the finite element analysis software OpenSEES.Established the limit state function of the overall seismic capacity of the BRB-CFSTF,and drew the structural probabilistic seismic capacity curve(PSCC)of the conditional failure probability of the structure under various failure states,and compared the PSCC of the BRB-CFSTF with the composite frame structure.It is found that the PSCC of the BRB-CFSTF are all on the right side of the composite frame structure,which shows that the seismic capacity of the BRB-CFSTF with anti-buckling bracing is higher than that of the composite frame.The BRB can work in synergy with CFST.The installation of BRB can significantly improve the seismic performance of the composite frame structure,and make full use of the energy consumption capacity of both.