【摘要】 针对底部带屈曲约束支撑(BRB)的摇摆桁架(HTBB)结构进行了拟动力试验和拟静力试验.采用El Centro波对试验结构进行了小震、中震和大震的拟动力加载,拟静力加载采用位移控制.拟动力试验结果表明,结构在小震、中震和大震阶段均有效地控制了结构的变形分布,层间变形均匀.BRB屈服后,结构损伤仅在BRB中发生,整体结构滞回曲线饱满、稳定,表现出优异的抗震性能.BRB的屈服先于摇摆桁架的损伤,从而保护了主体结构.模拟分析结果与试验结果相吻合.拟静力试验在1/40的顶点位移角下,滞回曲线饱满、稳定,表明结构在连续经历小震、中震、大震的地震激励后,仍具有优异的耗能能力和抗震性能.更多还原

【Abstract】 Pseudo-dynamic and pseudo-static tests were conducted on a hinged truss with buckling restrained braces( BRBs) at base( HTBB) specimen. During the pseudo-dynamic test,the peak ground motion( PGA) of El Centro ground motion record was scaled at three different levels,corresponding to frequent earthquake( FE),design based earthquake( DBE) and maximum considered earthquake( MCE). The pseudo-static test was conducted with the controlled displacement. The pseudo-dynamic test revealed that HTBB effectively controlled the deformation mode and the story drift was evenly distributed during three different seismic levels. After the yielding of BRB,only BRBs were damaged and the global hysteretic curve was full and stable,exhibiting the excellent seismic performance. BRBs yielded before the damage of the rocking truss,thus the main structure was protected from being damaged. Simulation results are in agreement with test results. During the quasi-static test,the hysteretic curve is full and stable even at the loading displacement of 1/40 roof drift ratio,demonstrating the excellent energy dissipation capacity and seismic performance of HTBB after suffering continuous earthquakes of FE,DBE and MCE intensities.更多还原