Seismic behaviour of Concrete-filled steel tubular column to H-Shape steel beam connection with side plate

To ensure the quality of filled concrete and improve the indoor utilization rate of steel frame structure residential buildings, a novel concrete-filled steel tubular (CFST) column to H-shape steel beam connection with side plate was proposed in this study. Six specimens of 1/3 scale were tested under reversed cyclic loading. To evaluate the hysteretic performance, failure mode, ductility, stiffness degradation, strength degradation and energy dissipa-tion capacity. The evaluation parameters include the axial load ratio, and the side plate height and thickness. The results indicated that the failure mode mainly exhibited the steel beam buckling failure, making all hysteretic curves exhibit typically spindle-shaped. The equivalent viscous damping coefficient is 0.305-0.394. The average story drift angle at the ultimate stage is 1/31 similar to 1/37. It shows that all connections possess sufficient energy dissipation capacity and excellent ductility. The peak and ultimate load are significantly reduced with the in-crease of the axial load ratio. And the secant stiffness increases in the elastic stage with the rise of the thickness and height of the side plate. Finally, the failure mode, hysteresis curve, and envelope curve achieved from the finite element method(FEM) established in this paper are consistent with the test results. And the FEM disclosed that the beam flange stress is transferred to the side plate through the fillet weld, and the side plate stress is transferred to the column panel through the fillet weld.