Finite Element Analysis of Seismic Performance of Duplex Concrete Filled Steel Tubular Column and Steel Beam Spatial Joint

To study the influence of the cutting depth of the beam flange on the seismic performance of the spatial joints between the duplex concrete-filled steel tubular column and H-shaped steel beam, six finite element models were established using ABAQUS finite element software, and low-cycle reciprocating loads were applied to the beam ends of the joint model. The results show that the cutting depth of the steel beam flange has a greater impact on the seismic resistance of the spatial joint between the duplex concrete-filled steel tubular column and the steel beam. With the increase of the cutting depth, the energy dissipation capacity of the joint first increases and then decreases, and the ductility of the joint is improved, but the stiffness and limit bearing capacity of the joint has decreased. Especially when the cutting depth is too large, the web in the weakened area of the H-shaped steel beam is prone to buckling instability.