T形方颈单边螺栓连接钢梁-方钢管柱加强节点拟静力试验研究OA

Compared with conventional double-side bolts,the T-head square-neck one-side bolts(TSOBs)bolted connection between steel beam and SHS column demonstrates significantly improved ductility and energy dissipation capacity.However,such connections often experience bolt pulling-out damage caused by deformation of the column wall.Therefore,a strengthening measure using built-in H-steel component was proposed for the TSOBs bolted beam to SHS column joints.Seismic performance tests under quasi-static load were conducted on four strengthened specimens.The results show that the H-steel component in the SHS column can prevent column wall deformation and bolt pulling-out failure under cyclic load,while significantly improving the stiffness and bearing capacity of the joints.However,the deformation capacity,strength reserve,and ductility of the joints are reduced.Lengthening and thickening the H-steel component lead to a greater enhancement in joint stiffness and bearing capacity,but at the greater expense of deformation capacity and ductility.The installation of H-steel component inside the SHS column does not affect the strength degradation performance or the equivalent viscous damping coefficient of the joints.Moreover,it mitigates stiffness degradation and improves energy dissipation capacity,with a maximum increase in energy dissipation reaching 102.3％.