摇摆桁架-BRB-钢框架体系耗能减震效果研究

Energy dissipation and damping effect analysis of rocking truss-BRB-steel frame system

在摇摆桁架-BRB-钢框架体系中设置BRB构件,以增强结构体系的耗能能力,控制并减轻结构的地震损伤。基于大震作用下的时程分析,对BRB构件的耗能量、能量时程曲线、累积位移系数以及结构层间位移集中系数进行了分析。结果表明:摇摆界面上的BRB构件滞回环饱满,在地震作用下能稳定地发挥耗能能力,各层BRB构件的屈服顺序以及耗能量的大小对该层的耗散地震能量的先后和大小影响较大,BRB构件累积位移系数随楼层数的增加而增大;摇摆桁架-BRB-钢框架体系侧向变形和结构损伤较原钢框架结构更加均匀,同时,BRB构件的耗能减震作用可提高结构体系抵抗地震损伤的可恢复性。

The proper BRB components are chosen in the swing interface to enhance the dissipation capacity of the structural system as well as control and reduce the seismic damage of structures. Based on time history analysis under rare earthquakes,energy dissipation,energy time history curves,cumulative plastic displacement ratio of BRB components,and the damage concentration factor of the structure have been analyzed. The results show that the hysteretic loops of BRB components on the swing interface are full,which have stable energy dissipation capacity under earthquakes. The sequence and amount of story earthquake energy dissipation are determined by the yield order and energy consumption of BRBs in this story. The cumulative plastic displacement ratio increases with the increase of the number of stories. The lateral deformation and damage of the rocking truss-BRB-steel frame are more uniform than steel frame,with the addition of BRB energy dissipation function,and the resilience of the structural system is improved evidently.