Seismic performance of joint between steel H-beam and rectangular concrete-filled hot-rolled-steel tubular column

In this paper, a new connection between the H-beam and rectangular concrete-filled hot-rolled-steel tubular column (CFHRSTC) was proposed to prevent the steel beam-column joint protruded from the inside wall in residential buildings. The quasi-static test and finite element analysis were conducted on four new joints to study the influence of the haunch stiffener configuration, internal steel plate thickness, and axial force on the failure mode, load-carrying capacity, ductility, energy dissipating capacity, and stiffness degradation of the joint. The results revealed that the hysteretic curve of every joint was full. The damage to the joint was concentrated in the H-beam, and the CFHRSTC remained elastic. The joint configuration could realize a weak beam-strong column and joint core connection. Using the haunch stiffener on two sides of the H-beam flange could effectively optimize load transfer at the end of the H-beam and joint core. As the axial force increased, the ultimate load-carrying capacity and ductility gradually decreased. Reducing the thickness of the internal steel plate did not significantly influence the seismic performance of the joint. Compared with the use of cover plate joints, the use of haunch stiffeners can effectively enhance the seismic performance of joints.