带不同顶底连接件高强螺栓连接铝合金梁柱节点抗震性能研究

Research on the Seismic Behavior of High-Strength Bolt Connected Aluminum Alloy Beam-Column Joints with Different Top-and-Seat Connectors

为研究高强螺栓连接铝合金框架梁柱节点的抗震性能,对带双腹板角型连接件的顶底角型件连接节点(节点SL)、顶底T形件连接节点(节点ST)、顶底加肋角型件连接节点(节点SC)进行循环加载试验研究,分析节点的滞回特性、刚度退化、承载能力及耗能能力等。结果表明:三类节点变形性能良好,最大层间位移角均超过0.03 rad,满足美国规范FEMA 350的延性设计要求;节点SL和节点ST的延性系数均大于3.0,破坏形态为连接件发生断裂,二者在保证充分耗能后应按连接件的极限承载力进行设计;节点SC发生梁端净截面破坏前累积耗能良好;节点SL的初始刚度最小,节点ST和SC与节点SL相比,初始刚度分别提高了36.7%和77.4%。利用有限元软件对试验进行模拟分析,二者结果吻合较好,验证了有限元模型的准确性及可靠性。

In order to study the seismic performance of high-strength bolted aluminum alloy beam-column joints,cyclic loading tests are carried out on top-and-seat angle joint(joint SL),top-and-seat T-joint(joint ST)and top-and-seat stiffened angle joint(joint SC)with double web angle members. The hysteretic characteristics,stiffness degradation,bearing capacity and energy dissipation capacity of the joints are analyzed. The results show that the deformation of the three joints is small,and the maximum inter-story drift angle is more than 0.03 rad,which meets the ductility design requirements of FEMA 350. The ductility coefficients of joint SL and ST are greater than 3.0,in which connector is broken. The ultimate bearing capacity of joint SL and ST should be designed under the ultimate bearing capacity of the connector after full energy dissipation. The cumulative dissipation capacity of joint SC before the net section failure of beam end is good. The initial stiffness of joint SL is the smallest. Compared with joint SL,the initial stiffnesses of joint ST and SC are increased by 36.7% and 77.4% respectively. A finite element software is used to simulate the test process,and the analysis result is in a good agreement with the test data,which verifies the accuracy and reliability of the finite element model.