Abstract:
In order to reduce the residual deformation and plastic damage of traditional reinforced concrete joints (RCJ), and to facilitate the rapid repair after earthquake. A new type of self-centering frictional beam-column joint is proposed (SCFJ). The residual deformation of the structure is reduced by adding friction self-centering connectors (FC) with both self-centering ability and energy dissipation capacity in the two reduced areas of the beam end, and the damage is concentrated in the reduced beam section. In this paper, a SCFJ and a RCJ specimen are tested under cyclic loading, and their hysteresis behavior, self-centering capacity, energy dissipation capacity and damage evolution are compared and analyzed. The seismic performance of the SCFJ is also simulated by finite element analysis. The results show that the damage of SCFJ is concentrated in the reduced beam section, which realizes the damage control; the concrete spalling and the longitudinal reinforcement yielding of SCFJ are later than those of RCJ, and the damage degree is obviously reduced. The resistance capacity and energy dissipation capacity of SCFJ are slightly lower than those of RCJ, but the residual displacement is significantly reduced. When the story drift ratio is 2.5%, the residual drift ratio of SCFJ is still less than 0.5%, only 32% of the residual drift ratio of RCJ.