SEISMIC PERFORMANCE RESEARCH OF BEAM-COLUMN ENERGY DISSIPATION JOINT WITH HIDDEN CORBEL
Chao Tong 1*, Jing Wu 1, Luqi Xie 1 and Chunyu Li 1
1 The Key Laboratory on Concrete and Prestressed Concrete Structures of Ministry of Education of China, Southeast University, Nanjing, China
Prefabricated beam-column joint is an essential part of prefabricated reinforced concrete frame (PRCF), in which the behavior of the joint has great influence on the seismic performance of PRCF. In this paper, a buckling restrained plate is installed under the beam-column joint with hidden corbel, while the reinforcement area is increased at the upper part of the joint. The cast-in-place method is used to connect the beam and column to form a beam-column energy dissipation mechanism with hidden corbel. The advantage of this new-type joint is that the upper joint can effectively control the crack propagation by increasing the number and diameter of the rebars. At the same time, the buckling restrained plate provides a strong energy dissipation capacity for the joint. In this paper, a joint model is established by the software OpenSees. The influence of various parameters of buckling restrained plate on energy dissipation capacity, load-carrying capacity and stiffness degradation are analyzed as well as the cracking propagation on the upper part of the beam is studied. The results show that the buckling restrained plate provides a stable energy dissipation capacity. Furthermore, due to the increase of the reinforcement area on the upper part of the beam end, the upper part of the cracking is effectively controlled, which indicates that the joint could perform a strong seismic capacity.
Prefabricated beam-column joint; Hidden corbel; Buckling restrained plate; Energy dissipation capacity; Cracking propagation controlling