带BRB的RC框架在高烈度区应用研究

STUDY ON APPLICATION OF BRB BRACED RC FRAMES IN HIGHLY SEISMIC REGIONS

针对地震高烈度区的混凝土框架结构,提出采用增设防屈曲支撑的方法来提高其抗震性能。阐述了防屈曲支撑的工作机理,给出了带BRB混凝土框架的设计方法,并结合算例进行了大震下的非线性时程分析。结果表明,BRB大震下可有效降低结构顶点位移反应,且其滞回曲线饱满,耗能效果明显,是一种值得推广的新型高性能支撑。

For RC frame structures in highly seismic regions, BRB is proposed to add to improve their performance. The work mecha- nism of BRB is explained in the paper and a design procedure of BRB RC frames is given. Based on ai~ example, nonhnear time-history analysis is conducted under major earthquakes. The results show that BRB can reduce top displacement response of a structure and demonstrates good energy dissipation effect with full hysteretic loops under major earthquakes, and is therefore a new type of high-per- formance steel brace which deserves promotion.