低轴压比耗能预制剪力墙抗震性能试验研究

Experimental study on seismic performance of energy dissipation precast shear wall with low axial compression ratio

装配式剪力墙结构存在大量的节点和接缝连接,这些连接是结构体系的薄弱环节。制作3个不同截面形式(一字形、T形、L形)的预制装配式混凝土剪力墙试件,依据"强水平缝,弱竖缝"的设计理念,墙体与底座之间采用混凝土现浇连接以达到强连接的目的,竖直方向设置宽250 mm竖缝,并在竖缝中装配3个软钢阻尼器。对其进行轴压比0.1条件下的低周反复荷载试验,研究试件在低轴压下的抗震性能。试验结果表明,使用软钢阻尼器连接的三种截面形式的剪力墙整体工作性能及耗能能力良好,各试件的位移延性系数均在2.5以上,具有良好的变形能力,低轴压比下边缘约束构件形式不同其承载力大小不同,软钢阻尼器平面内工作性能良好,且先于墙体钢筋参与耗能,达到预期效果。

There are a lot of joints and vertical seams in prefabricated shear wall structure,which are the weak positions of structure.Three precast concrete shear wall specimens with different flanges(I-shape,T-shape and L-shape)were made.According to the design concept of"strong horizontal joints and weak vertical seams",the connection between the wall and the base adopted cast-in-place concrete joints to achieve the purpose of strong connection.Vertical seams with 250 mm width were set in the vertical direction,and three soft steel dampers were installed.The low-cycle reversed loading test of specimens under the axial compression ratio of 0.1 was carried out.The experimental results show that the shear walls with three types of sections connected by soft steel dampers have good overall working performance and energy dissipation capacity,and the displacement ductility coefficient of each specimen is above 2.5,which has good deformation capacity.Under low axial compression ratio,different forms of edge restraint members have different bearing capacity.The in-plane performance of soft steel damper is good,and the energy dissipation is prior to the wall reinforcement,the desired effect is achieved.