新型装配式剪力墙结构水平缝抗震性能试验研究

Experimental Research on Seismic Performance of New Precast Concrete Shear Wall with Horizontal Seam

为研究一种采用了新型水平缝连接方式的装配式混凝土剪力墙结构的抗震性能,对1个现浇、3个预制装配剪力墙足尺比例试件进行低周反复荷载试验,其中,装配式剪力墙水平缝采用焊接钢板和贯通粗钢筋进行连接。同时,研究了竖向贯通粗钢筋直径和布置形式两个关键参数对装配式剪力墙抗震性能的影响规律。对试验结果分析可知:与现浇剪力墙相比,新型装配式剪力墙的承载力、延性性能、耗能能力均明显提高,刚度接近,开裂性能有所降低;适当增大贯通粗钢筋直径可提高开裂能力、承载力,但耗能能力、延性性能降低,对刚度影响很小;墙体中部增设一道竖向贯通筋会提高开裂性能、初始刚度,但会明显降低墙体承载力和延性性能,且最终发生底部剪切滑移破坏。综合对比来看,直径28 mm贯通粗钢筋、墙体两侧布置两道贯通筋的装配式试件表现出较好的抗震性能。

In order to study the seismic performance of a type of precast concrete shear wall structure with new horizontal seam,low cyclic loading experiments were conducted on four full scale specimens,including one reference cast-in-place specimen and three precast shear walls,and the horizontal seam of the precast shear wall was connected by welding steel plate and penetrating thick steel bar.At the same time,the influence of the thick reinforced bar diameter and layout on the aseismic performance of the precast shear wall was studied.Compared with cast-in-place specimen,the bearing capacity,ductility and energy dissipation capacity of the new precast concrete shear wall specimen can be enhanced,the stiffness is close and the cracking performance is reduced.Properly increasing the diameter of the thick reinforced bar can increase the cracking capacity and bearing capacity,but the energy dissipation capacity and ductility performance decrease,and the stiffness is equivalent.A thick reinforced bar in the middle of the wall added only improve the cracking performance and initial stiffness,which can obviously reduce the bearing capacity and ductility of the wall,and the shear slip failure of the wall is produced.A comprehensive comparison shows that the precast specimens with 28 mm-diameter thick reinforced bar and with two thick reinforced bars on both sides of the wall show better seismic performance.