含FRP约束竖向钢筋搭接连接的预制剪力墙抗震性能试验

Seismic Performance Tests of Prefabricated Shear Walls with FRP-Confined Lap Connections of Vertical Reinforcements

目的研究FRP约束的装配式剪力墙结构竖向连接的可靠性.方法在采用该种连接方式的钢筋锚固性能试验和搭接性能试验的基础上,完成了3个包含该种连接方式的剪力墙试件的拟静力试验,分析钢筋直径、搭接长度、等代关系等参数对剪力墙抗震性能的影响.结果在搭接长度l_(c)=1.04 l_(a)情况下,剪力墙试件以压弯破坏为主,且与现浇试件的破坏形态相同;试件滞回曲线的滞回环饱满,耗能性能较好;试件延性系数分别为4.3、3.9、4.6,极限位移角均不小于1/56,表明试件延性性能较好.结论研究证明装配式剪力墙结构的“含FRP约束环的钢筋搭接连接”方法是可靠的,能够保证剪力墙装配节点区域内竖向钢筋的有效应力传递.

In order to study the reliability of the vertical connection mode of prefabricated shear wall structure with FRP constraints,seismic behavior of three shear wall specimens using the proposed reinforcement connection method was studied by the pseudo-static test on the basis of the reinforcement anchoring test and the reinforcement lap performance test.In the test study,the effect of parameters,such as diameters,lap lengths and equivalent replacing relation of reinforcement,on the seismic performance of the shear wall were considered.The test results show:(1)all the shear wall specimens share the same compression bending failure as the conventional cast-in-situ specimens do,when the lap length equals to1.04(is the lap length specified by the Chinese Code);(2)the hysteretic loops of the specimens are full,and the energy dissipation performance is good;(3)the ductility coefficients of specimens are 4.3,3.9 and 4.6,respectively,and the ultimate displacement angles of all the shear wall specimens are not less than 1/56,both of which prove that the ductility of the specimens is excellent.The study indicates that the method of“lap connection of steel bars with FRP-restrained rings”for prefabricated shear wall structures is reliable,and can ensure the effective stress transfer between vertical reinforcements in the assembling joint area of shear walls.