SEISMIC PERFORMANCE OF EARTHQUAKE-RESILIENT PRECAST RC BEAM-COLUMN JOINTS

Aiming at the connection of precast RC beam-column joints and the rapid repair during post-earthquake, an earthquake-resilient connection form of beam-column joints is proposed. The connection is mainly composed of multi-slit energy dissipation devices, of shear connection key, of embedded devices and of other components connected by high-strength bolts. A full-scale precast joint was designed and tested under quasi-static loading. The failure mode, load-carrying capacity, deformation and energy dissipation capacity of the joint were studied and compared with those of a monolithic joint. The test results show that: the initial stiffness and load-carrying capacity of the precast joint are basically close to those of the monolithic joint, and it has higher ductility, higher deformation and higher energy dissipation capacity than that of the monolithic joint. The damage of the precast joint is mainly concentrated on multi-slit energy dissipation devices, and the precast beam and column components are basically kept in the elastic range, which can basically achieve the purpose of controllable damage location and convenient rapid repair during a post-earthquake. Meanwhile, the load-carrying capacity and deformation relationship of the device is deduced, and the simplified analysis model of the precast joint is established. The accuracy of the model is verified by the test results, which can lay a foundation for the subsequent study of the seismic performance and engineering analysis and of the design of precast RC frame structures. © 2022 Tsinghua University. All rights reserved.