震损可修复的钢制连接装配式剪力墙抗震性能试验研究
Experimental study on seismic performance of steel-connection precast shear walls with earthquake-damage reparability
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摘要: 为了加强装配式剪力墙的抗震性能及实现其震损后可修复功能,提出了一种可修复的钢制连接装配式剪力墙(Repairable Steel?connection Precast Shear Walls, RS?PSW),用钢制连接区域替代剪力墙易破坏的底部区域,实现将结构的损伤集中在钢制连接件上,在震后通过更换受损的钢制连接件来实现可修复功能。对普通混凝土剪力墙(编号为 SW0)、试件 RS?PSW1(初次加载)及试件 RS?PSW2(震损修复后加载)进行了低周往复加载试验,考察钢制连接装配式剪力墙的破坏模态、滞回性能、刚度和承载力退化、耗能能力及震损可修复性能。结果表明:相比SW0,RS?PSW1 在位移角达到 1.43% 时,上部预制混凝土墙体裂缝显著减少,塑性变形集中在钢制连接区域;修复后的试件 RS?PSW2 相比 SW0,其承载力和刚度略有下降,但延性和耗能能力有较大提升,破坏位移角达到了2.67%,较 SW0 提升了 66.7%,具有良好的变形能力。试件 RS?PSW2 再次加载时的各项抗震性能指标与初次加载时基本一致,验证了 RS?PSW 可实现地震作用下的震损可修复功能,并通过更换受损的钢制连接件使结构的抗震性能快速恢复。Abstract: To enhance the seismic performance of prefabricated shear walls and realize structural reparability after earthquake-induced damage, a repairable steel-connection precast shear wall (RS-PSW) is proposed. It could be achieved that the damage to the structure is concentrated on the steel connection by replacing the vulnerable bottom area of shear walls with steel-connection area.The function of reparability is implemented by replacing damaged steel-connection members after earthquakes. The ordinary concrete shear wall (SW0), specimen RS-PSW1(initial loaded), and specimen RS-PSW2(loaded after seismic damage) are subjected to low circumferential reciprocal loading tests to compare and analyze the failure modes, hysteretic behavior, stiffness and bearing capacity degradation, energy dissipation and seismic damage reparability of RS-PSW. The results show that compared with SW0, RS-PSW1 exhibits a sharp reduction of cracks in the upper precast concrete wall when the displacement angle reached 1.43%, and the deformation is concentrated in the steel-connection area. Compared with SW0, the bearing capacity and stiffness of repaired specimen RS-PSW2 have slightly decreased, but the ductility and energy dissipation have greatly improved, the failure displacement angle of RS-PSW2 reaches 2.67%, which is 66.7% higher than SW0. It indicates that RS-PSW2 presents a better deformation capacity. The seismic performance indexes of specimen RS-PSW2 under reloading are basically the same as those under initial loadign, which verifies that RS-PSW can realize the repairable function of earthquake-induced damage, and the seismic performance of the structure can be quickly restored by replacing the damaged steel connectors.