Experimental Research on Post-Fire Mechanical Properties of H-Steel Beam to Column Connection with Restraint at Beam Ends

The quasi-static test was carried out on 6 sets of H-steel beam to column connections with restraint at beam ends (JD2-2 had not passed the fire test), hysteretic curves and skeleton curves of joints were obtained, the bearing capacity, stiffness degradation, ductility and energy dissipation capacity of specimens were analyzed. The results showed that two-end extended end-plate connection joint had good deformation and energy dissipation capacity, the energy dissipation capacity of the one-end extended end-plate connection joint was weak and applicable to non-seismic zone; the strength, stiffness and ductility of joint were reduced by fire, and there was no effect on the energy dissipation capacity; Increasing the end-plate thickness could improve the bearing capacity and energy dissipation capacity of the joint after fire, it had little effect on improving the ductility of joint after fire; the ductility and energy dissipation capacity of the joint could be improved by setting stiffeners at beam ends and shear brackets at the bottom of the end plate, but the bearing capacity of the joint was not improved obviously after fire.