双面叠合混凝土剪力墙平面内和平面外抗震性能研究

IN-PLANE AND OUT-OF-PLANE MECHANICAL BEHAVIOR OF DOUBLE FACED SUPERPOSED CONCRETE SHEAR WALLS

双面叠合混凝土剪力墙由两侧预制混凝土板和中间后浇混凝土叠合层组成,具有整体性较好、大量节省模板和支撑、便于工业化生产、经济性好等优点,应用前景广阔。该文开展了剪力墙足尺模型的高轴压比下平面内和低轴压比下平面外低周反复荷载试验,对双面叠合剪力墙的抗震性能进行了研究与探讨。研究表明:双面叠合剪力墙在平面内和平面外低周反复荷载下的破坏形态与现浇剪力墙相同,均发生受弯破坏;4片剪力墙滞回曲线特征相似,双面叠合剪力墙的耗能性能好于现浇剪力墙;双面叠合剪力墙的平面内承载力比现浇剪力墙高约5%,平面外承载力低约12%;平面内和平面外加载时双面叠合剪力墙均具有良好的延性,其延性系数分别为2.15和3.83,比现浇剪力墙分别高约25%和20%。双面叠合剪力墙基于规范计算值的抗弯及抗剪安全系数均达到1.1以上,双面叠合剪力墙破坏时其水平接缝处的剪力远小于其接缝抗剪承载力设计值。总体而言,双面叠合剪力墙具有良好的抗震性能,可在抗震设防地区推广应用。

A typical double faced superposed concrete shear wall is composed of two precast concrete panels on both sides and cast-in-place concrete layer between them. It has a wide application prospect with advantages of good integrity, template and support saving, construction efficiency and saving in cost. This paper conducts in-plane low reversed cyclic loading tests under high axial compressive ratio and out-of-plane low reversed cyclic loading tests under low axial compressive ratio on full-scale concrete shear walls to investigate seismic behavior of double-faced superposed concrete shear walls. The results reveal that all four specimens fail in bending and exhibit similar hysteresis characteristics. The superposed specimens show better energy dissipation than cast-in-place（CIP） specimens. The bearing capacity of the superposed specimen is 5% higher than that of CIP specimen under in-plane cyclic loading; while the bearing capacity of the former is 12% lower than that of the latter under out-of-plane cyclic loading. Both the two superposed specimens behave in ductile manner with ductility factors of 2.15 and 3.83, respectively, which are 25% and 20% higher than that of the corresponding CIP specimens. The flexural and shear safety factors of the superposed specimens are larger than 1.1. The ultimate shear load at horizontal connection of the superposed specimen is much less than its shear capacity. In general, double faced superposed concrete shear walls show good seismic performance and can be applied in seismic regions.