Abstract
The wet prefabricated beam-to-column joint (PBCJ) has a densely reinforced panel zone and is difficult to construct, leading to poor connection reliability. To address this problem, we propose a dry PBCJ, where the concrete column is encased with steel plates at the connection and the beams and the column are connected by high-strength bolts. The method for constructing the joint is described herein. A total of six full-scale PBCJs were designed and subjected to quasi-static loading tests with different stirrup ratios, reinforcement strengths, and joint strengthening methods. Based on the test loading process, the joint failure mode is summarised, and a trilinear backbone curve model is proposed. According to the characteristics of the hysteresis curve and the backbone curve, the stiffness degradation law and hysteresis rule are analysed; then, the restoring force model for the new type of PBCJ is established, and the model results are compared with the test results. The data show that the new bolted PBCJ undergoes the cracking, yielding, ultimate, and failure stages; the trilinear backbone curve, which is composed of an elastic section, an elastoplastic section, and a plastic section, well describes the load-carrying characteristics of the joint. The backbone curve calculated by the established restoring force model is consistent with that obtained from the tests, indicating that the model can accurately describe the energy dissipation performance of the new PBCJ and thus provide a theoretical basis for the seismic performance analysis of this type of joint.
Research on the restoring force model of an assembled beam-column joint with ring-grooved rivets
