Research on the Influence of Different Parameters on the Hysteretic Performance of Buckling-Constrained Prefabricated Beam-Column Joints

A new type of prefabricated beam-column joint with buckling constraints is proposed, which has better energy dissipation capacity and is easy to repair after earthquakes. The joint consists of a steel tube column with cantilever beam and an intermediate beam. The cantilever beam and the intermediate beam are connected by a buckling constraint connection device, which can effectively improve the ductility of the structure while ensuring the plastic damage control. The quasi-static analysis of eight cases with different parameters was carried out by finite element simulations to study the influence of different parameters on the mechanical properties and failure modes of the joint, and then the key parameters affecting the bearing energy dissipation capacity and buckling constraint effects of the joint were determined. The results showed that the bearing energy dissipation capacity of the joint increased significantly with the increase of the thickness and strength of the flange cover plate. As the stiffening height of the outer flange cover plate increased, the spacing between the inner flange cover plate and the web connector decreased and the stiffening degree of the web connector increased, the buckling constraint effect of the joint could be significantly enhanced. Too few high-strength bolts would cause premature slip of the flange cover plate, which would affect the bearing energy dissipation capacity of the joint.