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由于剪力墙延性较小,在强震作用下易受到损伤且震后修复困难。将屈曲约束支撑(BRB)与铰支墙(HW)相结合,提出了具有很大延性和稳定滞回能力的底部设置BRB的铰支墙(HWBB),为避免中部楼层处墙体损伤,采用连续设置BRB的铰支墙(CHWBB)形式。多遇地震作用下BRB未屈服为结构提供弹性刚度,罕遇地震作用下BRB屈服为结构提供附加阻尼。采用Open Sees软件进行动力时程分析,对比了底部设置BRB的铰支墙-框架结构(HWBBF)、连续设置BRB的铰支墙-框架结构(CHWBBF)和剪力墙框架结构(SWF)的抗震性能。分析结果表明:HWBBF、CHWBBF和SWF具有相似的位移响应和变形模式,CHWBB可以大幅降低地震作用下墙体的弯矩和剪力需求,可使损伤集中在易于震后更换的BRB上。
Due to the small ductility of the shear wall, it is easily damaged by the strong earthquake and difficult to repair after the earthquake. Combining Buckling Restraint Braces (BRBs) with Hinged Retaining Walls (HWs), a BRB Hinged Retaining Wall (HWBB) with BRB at the bottom is proposed with great ductility and stable hysteresis. In order to avoid wall damage at the middle floors, The BRB Hinge Support Wall (CHWBB) format is set continuously. The BRB did not yield to provide elastic stiffness for the structure under the earthquake and the additional damping was provided by the BRB yielding to the structure under the rare earthquake. The dynamic time-history analysis with Open Sees software is carried out to compare the seismic performance of the HWBBF, the CHBBBF and the SWF of the BRB, performance. The results show that: HWBBF, CHWBBF and SWF have similar displacement response and deformation mode. CHWBB can significantly reduce the bending moment and shear force of the wall under earthquake action, and can concentrate the damage on the BRB which is easy to replace after earthquake.