高效装配式钢筋混凝土剪力墙抗震性能试验研究

Experimental study on seismic performance of high-efficiency prefabricated reinforced concrete shear wall

针对装配式剪力墙边缘构件竖向连接钢筋数量较多、直径较小,造成套筒多、钢筋对中困难且现场灌浆困难,人工加工绑扎箍筋耗工费时且难以自动化作业生产等问题,提出了剪力墙边缘构件采用大直径钢筋和大直径套筒连接、箍筋采用连续螺旋方箍构造的高效装配式剪力墙构造形式,完成了3个设计轴压比为0.2、1个设计轴压比为0.6和2个设计轴压比为0.4的足尺装配式剪力墙试件的拟静力加载试验,研究不同轴压比、边缘构件纵筋连接形式与箍筋构造形式下剪力墙的抗震性能。结果表明:6个剪力墙均实现了预期的弯曲破坏模式;剪力墙受弯承载力实测值为计算值的1.03~1.15倍,具有一定的安全冗余度;剪力墙极限位移角为1/77~1/42,大于GB 50011—2010《建筑抗震设计规范》中要求的罕遇地震作用下剪力墙结构弹塑性层间位移角的限值1/120,表现出良好的变形能力。提出的装配式剪力墙构造连接方案合理可靠,在保证剪力墙的承载能力和抗震性能的前提下,建造成本较传统连接方案的降低了8%~18%。

The use of a large number of small-diameter vertically connected steel bars in the edge components of prefabricated shear walls generally results in multiple sleeves,difficulty in aligning the steel bars and on-site grouting,large labor and time consumption and difficulty in automated production of manual processing and binding of hoops.To solve the problem,an efficient prefabricated shear wall construction form was proposed in this paper,which used large-diameter steel bars and large-diameter sleeves to connect the edge components of shear walls,and continuous spiral square hoops to construct the stirrups.Three full-scale assembled shear wall specimens with a design axial compression ratio of 0.2,one with a design axial compression ratio of 0.6,and two with a design axial compression ratio of 0.4 were tested under quasi-static loading to study the seismic performance of the shear walls,and the test parameters included axial compression ratio,longitudinal reinforcement connection form of edge components,and stirrup reinforcement construction form.The results show that all six shear walls fail in the expected bending mode.The measured bending bearing capacity of shear walls is 1.03-1.15 times of the calculated value,indicating a certain degree of safety redundancy.The ultimate displacement angle of the shear wall is 1/77-1/42,which is greater than the limit value of 1/120 given by the GB 50011—2010‘Code for seismic design of buildings’for the elastic-plastic inter story displacement angle of the shear wall structure under rare earthquakes,demonstrating its good deformation capacity.The proposed prefabricated shear wall construction connection scheme is reasonable and reliable,which not only ensures the bearing capacity and seismic performance of the shear wall,but also reduces the construction cost by 8%to 18%compared to traditional connection schemes.