不同套筒连接装配式剪力墙抗震性能对比分析

Comparative Analysis of Seismic Performance of Fabricated Shear Walls with Different Sleeve Connections

以3个剪力墙的拟静力试验为基础,结合非线性有限元分析结果,对比分析了灌浆套筒连接装配式剪力墙和冷挤压套筒连接装配式剪力墙的抗震性能,重点考察其破坏形态、耗能能力以及延性性能这三方面的指标。研究结果表明:在连接件可靠的情况下,套筒连接装配式剪力墙的延性优于现浇试件,灌浆套筒连接装配式剪力墙的延性优于冷挤压套筒连接装配式剪力墙,屈服后的刚度也略大于冷挤压套筒连接装配式剪力墙;灌浆套筒连接装配式剪力墙与冷挤压套筒连接装配式剪力墙的屈服荷载、峰值荷载均随轴压比的增大而增大,但冷挤压套筒装配式剪力墙的增大速率更大;采用灌浆套筒连接的剪力墙在高轴压比下套筒连接件发生弯曲,使得该剪力墙试件出现了延性系数突变的情况,在高轴压比情况下宜慎重采用该种连接方式。

Based on the quasi-static test of three shear walls and combined with the results of nonlinear finite element analysis,the seismic performance of prefabricated shear walls with grouting sleeve and cold extrusion sleeve is compared and analyzed,with emphasis on its failure mode,energy dissipation capacity and ductility.The results show that when the connectors are reliable,the ductility of the sleeve connected prefabricated shear wall is better than that of the cast-in-situ specimen,the ductility of the grouting sleeve connection is better than that of the cold extrusion sleeve connection,and the stiffness of the grouting sleeve prefabricated shear wall after yielding is slightly greater than that of the cold extrusion sleeve connected prefabricated shear wall.Besides,the yield load and seismic limit load of grouting sleeve assembled shear wall and cold extrusion sleeve assembled shear wall increase with the increase of axial compression ratio,and the increase rate of cold extrusion sleeve assembled shear wall is greater.Finally,the sleeve connector of grouted sleeve shear wall is bent under high axial compression ratio,resulting in the sudden change of ductility coefficient of shear wall specimens.This connection method should be used carefully under high axial compression ratio.