装配整体式钢筋混凝土剪力墙子结构抗震性能试验研究

对一栋3层足尺的新型装配整体式混凝土剪力墙子结构进行拟静力试验。该结构中包含4种连接构造，即同层同跨内预制墙的竖缝采用干式连接，同层相互垂直墙体间采用现浇转角墙连接，上、下预制墙间采用型钢抗剪键和后浇型钢边缘构件2种连接构造进行连接。试验结果表明：该类型装配整体式型钢剪力墙结构具有良好的抗震性能；连梁在整个抗侧力体系中起到第一道防线的作用，加载结束时，连梁发生明显剪切破坏，具有较强的耗能能力；干式连接在试验中陆续进入屈服，可作为结构的第二道耗能防线；试验后期，部分干式连接的焊缝出现断裂，无法继续限制墙肢对楼板的冲切作用。型钢边缘构件和后浇RC转角墙中的纵筋分别在层间位移角达到1/150和1/100时发生屈服；整体模型在层间位移角达到1/75后，未出现承载力失效或楼板构件脱落现象，可认为该结构体系的抗震性能等同于现浇剪力墙结构。

Experimental study on seismic behavior of monolithic precastreinforced concrete shear wall substructure

To examine the seismic performance of the proposed monolithic precast RC shear wall structures, a full-scale three-story substructure was tested under reversal cyclic loads. The test specimen contains four types of connections, namely, the ‘dry connections’ and the ‘cast-in-situ elbow RC joints’ to connect precast RC walls at the same story, and the ‘shaped steel shear keys’ and the ‘shaped steel boundary elements’ to connect the walls at different stories. The test results demonstrate that the specimen performs well in terms of the seismic resistance. The coupling beams play the role of the first defense against the lateral force. When the test was finished, apparent shear failure damages were observed in most coupling beams. These coupling beams had a considerable energy-dissipating capacity. The ‘dry connections’ yielded gradually, which are deemed as the second seismic defense measure. With the increase of lateral deformation, some ‘dry connections’ fractured at the welding joints, and wall pieces lost confinement in the section plane and punched significantly to the slabs. The steel members and the vertical reinforcements in the post-cast corner walls yielded subsequently at the drift ratio of 1/150 and 1/100, respectively. When the drift ratio reached 1/75, the specimen still has enough bearing capacity and the integrity of assembled members remained. It is concluded that this monolithic precast RC shear wall structure has a similar seismic performance to the one completely cast-in-situ.