Seismic performance of beam to box-column connection by a short stub beam

In this paper, the behaviour of an innovative connection proposed to connect steel beams to box-columns is investigated experimentally and numerically. This connection eliminates the need for using continuity plate inside the box-column by introducing a new load transfer mechanism. The connection also benefits from the extended end-plate connection in its configuration, allowing for fast erection and cost-effectiveness. Two full-scale specimens were tested under reversed load cycles, and parameters including connection rigidity, ductility, and energy dissipation capacity were evaluated. In all specimens, the plastic hinge formed within the beam, and its location complied with the requirements of extended end-plate connections. The specimens could resist 6% story drift with stable hysteretic curves, revealing their qualification for use in special moment resisting frames (SMF) based on seismic provisions of AISC 341-16. Moreover, the specimens showed high ductility and energy dissipation capacity along with reasonable stiffness degradation. Finally, the unnecessity of continuity plates was investigated, which confirmed that the continuity plates were not required in the proposed connection.