竖向钢筋采用不同连接方法的预制钢筋混凝土剪力墙抗震性能试验

Tests on seismic behavior of pre-cast shear walls with various methods of vertical reinforcement splicing

介绍了5个剪跨比为2.25的钢筋混凝土剪力墙试件的拟静力试验,其中1个为现浇墙,4个为竖向钢筋采用不同连接方法的预制墙。试验结果表明:预制墙试件与现浇墙试件的破坏形态基本相同,为边缘构件竖向钢筋受拉屈服、墙底混凝土受压破坏;套筒浆锚连接能有效传递钢筋应力;套箍连接试件的预制墙与底部现浇部分发生面内错动,其极限位移角和耗能能力最小;预制墙试件的极限位移角大于1/100;轴压力作用下的正截面承载力试验值大于现行规范公式计算值。根据试验结果,提出了预制剪力墙需进一步研究的建议。

Quasi-static tests of five reinforced concrete shear wall specimens with aspect ratio of 2.25 are introduced in this paper.Among the five specimens,one was cast-in-place wall specimen,and other four were pre-cast wall specimens with different methods of vertical reinforcement splicing.The test results indicate that the failure mode of the pre-cast wall specimens is the same as that of the cast-in-place wall specimen,i.e.,tensile yield of the vertical reinforcements in the boundary elements and compressive failure of concrete at the wall bottom.The sleeve-mortar splicing transfers stresses of vertical reinforcement effectively.The specimen with stirrup splicing has in-plane slide between the pre-cast wall and the cast-in-place part,which has the minimum values of ultimate drift ratio and energy dissipation capacity among the five specimens.The ultimate drift ratios of all specimens are larger than 1/100.The measured compression-flexural strength of the pre-cast wall specimens are larger than the current code calculated value.Based on the test results,recommendations on further studies of pre-cast shear walls are proposed.