竖向钢筋套筒挤压连接的预制钢筋混凝土剪力墙抗震性能试验研究

对4个剪跨比为2.11，竖向钢筋套筒挤压连接的预制钢筋混凝土剪力墙试件进行了拟静力试验。其中，3个试件为一字形截面剪力墙，轴压比分别为0.5、0.6和0.2；1个试件为T形截面剪力墙，轴压比为0.5。试验结果表明：剪力墙以压弯破坏为主，边缘构件竖向钢筋受拉屈服、墙底两端混凝土受压破坏；水平荷载 位移滞回曲线有一定程度捏拢；一字形截面剪力墙及T形截面剪力墙翼缘端受压时极限位移角不小于1/80，T形截面剪力墙腹板端受压时极限位移角为1/110；对于偏心受压承载力试验值与GB 50010-2010规范公式计算值之比，一字形截面剪力墙约为1.20，T形截面剪力墙翼缘端受压和腹板端受压时分别为1.04和1.11；套筒挤压连接能有效传递钢筋拉、压荷载作用。竖向钢筋套筒挤压连接的预制钢筋混凝土剪力墙的抗震性能满足现行规范的要求。

Tests on seismic behavior of precast RC shear walls with vertical rebar splicing by pressed sleeve

Quasi-static tests of four precast concrete shear wall specimens with shear span ratio of 2.11 were conducted. The vertical rebar of the precast shear wall was spliced by pressed sleeves. Among them, three shear walls had a rectangular section and the axial load ratios were 0.5, 0.6 and 0.2 respectively. One shear wall had a T section and an axial load ratio 0.5. The test results indicate that the shear wall specimens fail in compression and flexure interaction. The vertical rebars at boundary elements yield in tension and concrete at the edge of wall bottom crush in compression. The lateral force-displacement hysteretic loops have a degree of pinch. The ultimate rotation angles of the shear walls with rectangular section and T section, where the flange is in compression, are not less than 1/80. The ultimate rotation angle of shear wall with T section, where the web is in compression,is 1/110. The ratio of the measured compression-flexure strength to the calculated strength according to the formula of GB 50010-2010 is about 1.20 for the shear walls with rectangular section. The ratios become 1.04 and 1.11 for walls with T section, where the flange and web are in compression respectively. The pressed sleeve connector can transfer the tensile and compressive forces of rebar effectively. The seismic behavior of the precast shear wall with the vertical rebar splicing by pressed sleeve satisfies the current code requirements.