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Seismic Performance Tests of Prefabricated Shear Walls Connected with Cone-Sleeve Locking of Vertical Steel Bars
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摘要: 现阶段装配式剪力墙多采用灌浆套筒连接,施工过程中易出现灌浆不密实等缺陷。为避免潜在的灌浆缺陷,提出了一种预留后浇区竖向钢筋采用锥套紧锁连接的装配式剪力墙,并开展抗震性能研究。分别对两片剪力墙进行了轴压比为0.1的拟静力试验,其中一片剪力墙为现浇,另一片为预留后浇区竖向钢筋采用锥套紧锁连接的装配式剪力墙。试验发现,现浇剪力墙和锥套紧锁连接的装配式剪力墙试件,在位移角分别达到1/40和1/50时,试件荷载降至峰值荷载的85%以下,前者下部两侧角部墙体混凝土被压溃,后者左侧后浇区竖向钢筋被拉断,且前者的延性比后者高22%,初期刚度后者比前者高20%。此外,两试件破坏形态基本相同,均发生弯剪破坏,滞回性能和耗能能力基本一致。Abstract: At present, prefabricated concrete shear walls are mostly connected by grouting sleeves, which can lead to defects such as loose grouting during construction. To avoid potential grouting defects, a prefabricated shear wall with vertical steel bars connected by prestressed cone-sleeve in reserved post cast area is proposed, and seismic performance research was carried out. Quasi-static tests were conducted on two concrete shear walls with an axial compression ratio of 0.1. One shear wall was cast-in-place, and the other was a prefabricated shear wall with prestressed cone-sleeve connections. The experiment found that when the drift ratio of the cast-in-place shear wall and the prefabricated shear wall were 1/40 and 1/50, respectively, the load of the specimens decreased to less than 85% of the peak load. The concrete on the lower corner wall of the cast-in-place shear wall was crushed, and the vertical steel bars in the left post-cast area of the prefabricated shear wall were pulled off. The ductility of the former was 22% higher than that of the latter, and the initial stiffness of the latter was 20% higher than that of the former. In addition, the failure modes of the two shear walls were basically the same, both of which underwent bending and shear failure, and the hysteresis performance and energy dissipation capacity were basically the same.
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