Abstract:
To improve the deformation capacity and energy dissipation capacity of prefabricated steel structures under large earthquakes, and to achieve damage control, proposed is a new type of beam-column joint with friction-bearing energy-dissipation connection (JFBEC). The JFBEC composes a steel column welded with a cantilever steel beam, independent steel beam, flange energy-dissipation element, web steel hinge, and high-strength bolts. A total of 5 beam-column joints with friction-bearing energy-dissipation connection and one beam-column joint with a single flange cover plate (JSFCP) were designed and tested under cyclic loading. Studied are the failure mode, bearing capacity, load-displacement behavior, energy dissipation and rotational behavior. The study results demonstrate that JFBEC exhibited an evident sliding behavior, with bending residual deformation in the flange energy-dissipation element. However, the JSFCP failed with obvious local buckling. The bearing capacity of JFBEC was smaller than that of JSFCP, while the JFBEC developed a more stable mechanical behavior, with more excellent energy dissipation capacity and ductility. The plastic rotation of JFBEC exceeds 0.044 rad, satisfying the requirements for a high-ductile connection. The slipping distance in the flange energy-dissipation element greatly affects the failure mode, and the fracture of the sliding plate might occur with a shorter slotted hole and lead to the failure of the proposed joint. With the width of sliding plate increasing, the bearing capacity and energy dissipation was enhanced. The increase of the slipping distance was beneficial for the ductility behavior and the energy dissipation capacity, but it had little effect on the bearing capacity.