装配式矩形钢管混凝土柱-钢梁侧板连接节点抗震性能研究OA北大核心CSTPCD

Side plate welded beam-column joints are difficult to repair after earthquake.In order to solve this problem,a type of prefabricated concrete-filled rectangular steel tubular(CFRST)column-steel beam connections with side plate was proposed.The beam-column connection was realized by fixing different forms of metal dampers and pin shafts via the side plate.Low-cycle repeated tests and finite element analysis were carried out on five joint specimens using constrained dampers,U-shaped dampers and S-shaped dampers.The effects of metal yielding damper type,energy dissipated plate constraint form and thickness on the seismic performance and post-earthquake reparability of prefabricated CFRST column-steel beam connections with side plate were studied.The influence of the bend angle of the S-shaped damper energy dissipated plate on the seismic performance of the connections was studied by finite element parametric analysis.The results show that the five connections have good seismic performance,and the replacement of dampers can achieve rapid recovery of connection function.Comparing the ultimate load and initial stiffness of the three connections,the constrained damper connection is the highest,followed by the S-shaped damper connection,and the U-shaped damper connection is the lowest.The stiffness of the pad has little effect on the ultimate load and seismic performance of the constrained damper connection.The rigid pad can improve the residual capacity of the connection.The ductility and total energy dissipation of S-shaped damper connections are significantly higher than those of other connections.Increasing the thickness of the energy dissipated plate can improve the mechanical performance of the U-shaped damper connection,but the effect is not significant.The results from finite element parametric analysis show that reducing the bend angle of the energy dissipated plate can significantly improve the ultimate load and initial stiffness of the S-shaped damper connection,and the bend angle of the energy dissipated plate should be in the range of 60°-90°.