双面叠合剪力墙平面外受力性能

为研究带水平接缝的装配整体式双面叠合剪力墙的平面外受力性能,完成了1片双面叠合剪力墙和1片现浇剪力墙足尺试件的平面外静力加载试验和有限元参数分析,对比分析了各试件的破坏形态、荷载-位移曲线、刚度退化特征和水平接缝处竖向连接钢筋的传力性能,提出了双面叠合剪力墙平面外受弯承载力和水平接缝截面受剪承载力的计算方法。结果表明:双面叠合剪力墙与现浇剪力墙试件的破坏形态基本相同,均为平面外弯曲破坏,与现浇剪力墙相比,双面叠合剪力墙试件的初始裂缝出现在底部水平接缝处,随后在墙面出现并逐级向上发展,表现出良好的延性破坏特征; 双面叠合剪力墙试件具有较高的平面外受弯承载力和变形能力,其初始刚度、极限承载力、平面外位移延性系数均大于现浇剪力墙试件; 双面叠合剪力墙试件的有限元计算结果与试验结果吻合良好; 随着轴压比增加,叠合剪力墙平面外承载力明显增加,但延性明显降低; 高厚比越小,叠合剪力墙平面外承载力越高,而对延性则影响不大; 提出的受弯承载力计算结果与试验结果吻合较好,可用于指导工程实践。

Out-of-plane Mechanical Behavior of Double-face Superposed Shear Wall

In order to study the out-of-plane mechanical behavior of assembly double-face superposed shear wall with horizontal joint, the out-of-plane static loading test and finite element parameter analysis of one full-scale specimen of double-face superposed shear wall and one cast-in-place shear wall were completed. The failure mode, load-displacement curve, stiffness degradation characteristics and the force transfer performance of the vertical connection reinforcement at the horizontal joint were compared and analyzed. The out-of-plane bending capacity and the shear bearing capacity of the horizontal joint section of the double-face superposed shear wall were proposed. The results show that the failure modes of the double-face shear wall and cast-in-situ shear wall are basically the same, both of them are out-of-plane bending failure. Compared with the cast-in-situ shear wall, the initial crack of the double-face superposed shear wall specimen appears at the bottom horizontal joint, and then the crack appears on the wall surface and develops progressively upward, showing good ductile failure characteristics. The double-face superposed shear wall specimen has higher out-of-plane bending capacity and deformation capacity, and their initial stiffness, ultimate bearing capacity and out-of-plane displacement ductility coefficient are all larger than those of cast-in-situ shear wall specimen. The simulation results of finite element calculation of double-face superposed shear wall specimen are in good agreement with the experimental results. With the increase of axial compression ratio, the out-of-plane bearing capacity of the double-face superposed shear wall increases significantly, but the ductility decreases obviously. The smaller the height to thickness ratio, the higher the out-of-plane bearing capacity of the double-face superposed shear wall, but it has little effect on ductility. The calculated results of flexural bearing capacity formula proposed are in good agreement with the test results, which can be used to guide engineering practice.