不同极限位移BRB的RC框架结构#br# 抗地震倒塌性能研究

设计6个装有不同极限位移BRB的RC框架结构，基于OpenSees建立相应的有限元模型并验证模型的可行性和BRB模拟准确性，对装有不同极限位移BRB的RC框架结构模型进行增量动力分析和地震易损性分析，研究不同极限位移BRB的RC框架结构抗地震倒塌性能。研究表明：随着BRB极限位移的增加，结构抗倒塌性能得到提升；当系数小于1.2倍时，罕遇地震下结构中出现BRB失效概率大于5%，当系数大于1.2倍时，BRB极限位移提高对结构抗倒塌性能提高有所下降；《建筑消能减震技术规程》（JGJ 297—2013）对消能减震装置极限变形取12倍安全系数是合理的。

Study on seismic collapse performance of RC frame structure with #br# different ultimate displacements BRB

Buckling restrained braces （BRBs） with different ultimate deformation capacities were designed for six RC frame structures. The numerical models of the structural buildings were established and verified in OpenSees. Incremental dynamic analyses and seismic vulnerability analyses were carried out for all six building models. The influence of different ultimate deformation capacity of BRBs on seismic collapse performance of the RC frame structure was evaluated. The results reveal that seismic collapse response of the structures improves with increasing BRB ultimate displacement. The failure probability of BRBs is higher than 5% under rare earthquake when the ultimate deformation coefficient is less than 1.2. While the increasing rate of seismic collapse performance decrease with a further increase of BRB ultimate deformation when the coefficient is greater than 1.2. The results imply the reasonability for taking ultimate deformation coefficient value of 1.2 as the safety factor of energy dissipation device in Technical specification for seismic energy dissipation of buildings （JGJ 297—2013).