可更换延性耗能连接组件的钢框架节点抗震性能研究

针对预制装配式RC梁柱节点连接及震损后快速修复的问题，提出了一种可恢复的梁柱节点连接形式。该连接主要由多缝耗能装置、抗剪连接键和预埋装置等部件通过高强螺栓连接而成。设计了一个装配式节点足尺试件并进行拟静力加载试验，研究该节点的破坏模式、承载力、变形和耗能能力等特性，并与现浇节点试件试验结果进行对比分析。结果表明：该装配式节点的初始刚度和承载力基本接近于现浇节点，且相比于现浇节点具有更高的延性、变形和耗能能力。装配式节点的破坏主要集中在多缝耗能装置上，预制梁柱构件基本保持在弹性范围内，基本可以实现节点损伤位置可控以及便于震后快速修复的目的。同时，推导多缝耗能装置的承载力-变形关系，建立装配式梁柱节点的简化分析模型，并通过试验结果验证了其准确性，可为后续研究装配式RC框架结构的抗震性能和工程分析设计奠定基础。

Impact of Northridge earthquake on precast concrete design practice

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.