不同连接构造的装配式混凝土剪力墙抗震性能试验研究

试验研究了2种不同连接构造的装配式混凝土剪力墙抗震性能,第一种为钢筋浆锚搭接干式连接节点,第二种则在第一种基础上进行构造变化,边缘构件局部现浇,墙肢中部仍然采用钢筋浆锚搭接连接,形成干、湿混合连接节点.分别制作1片干式连接节点、1片混合连接节点足尺试件进行低周反复荷载加载试验,并与同条件现浇试件进行对比.试验结果表明,在承载力、刚度、位移延性及耗能能力等方面,2种装配式试件均与现浇试件相当,其抗震能力可认为与现浇等同.同时,混合连接节点试件虽在耗能方面稍优于干式连接节点试件,但优势并不明显,且考虑到其施工工艺复杂,现浇混凝土浇筑质量较难得到保障,易对节点抗震性能产生明显不良影响,故不建议采用.

Experimental Investigation on Seismic Performance of Precast Concrete Shear Walls with Different Connections

Two different types of horizontal connections for precast concrete shear walls are proposed and tested to evaluate their seismic performance. One is dry connection with vertical reinforcing bars anchored into the grout-filled metal bellows embedded in the precast wall, while the other is hybrid connection where the boundary elements are formed by locally placing concrete with vertical reinforcing bars lapping in the cast-in-place concrete, and the reinforcing bars placement is the same that of the dry connection. Three full-scale specimens of the dry connection, hybrid connection, and cast-in-place connection were prefabricated and tested under the low-cycle reverse loading. The measured results showed that both the precast specimens performed similarly, such as the strength, stiffness, displacement ductility, and energy dissipation capacity, and they possessed comparable seismic performance when compared with the cast-in-place specimen. Meanwhile, the seismic behavior of the hybrid connection was obviously dependent on the pouring quality of the locally placing concrete. Because of the complexity in the construction technology for the concrete placing of hybrid connection, it is difficult to ensure the quality, and the seismic performance is considerably weakened. Therefore, it is not recommended to apply the hybrid connection in precast concrete shear walls.