Seismic Performance Of Spring Self-Reset Energy Dissipation Beam-Column Joint

The residual deformation of the traditional steel frame after the earthquake is large,the repair is difficult,and the repair cost is high.In this paper,a new type of spring-type self-resetting energy-dissipating beam-column joint is proposed.The joint provides restoring force through a transmission structure composed of high-strength springs and rigid rods,and mild steel is used as an energy-dissipating component to dissipate seismic energy.The joint is simple in structure,simple in construction,excellent in self-reset performance and energy consumption,and small in residual deformation after the earthquake.It can be put into use again after a little repair or even without repair,which is of engineering significance.The main research process of this paper is as follows:Firstly,the structure and assembly method of the joint and the force transmission path are briefly described,and a series of related properties of the joint are checked to verify the feasibility of its theory.In order to ensure the validity of the numerical simulation,the self-resetting beam-column joints with complete test data were selected,and the numerical calculation was carried out under the action of low-cycle reciprocating load by using the finite element method,and it was verified that it was consistent with the test data.Furthermore,based on ABAQUS,a spring self-resetting energy dissipation beam-column node model is established,and the interaction between the various components of the node,the setting of boundary conditions,and the application process of load,preload and preload are described in detail.The mesh type of the node and meshed it.Then,the new spring self-resetting energy dissipation beam-column joint and the traditional beam-column joint finite element model are established respectively,and the hysteresis curve,skeleton curve,residual deformation curve,stiffness degradation curve and dissipation curve of the two are obtained through finite element numerical calculation.The energy coefficient curve is analyzed,compared and explained for the seismic performance of the two joints.In addition,the influencing factors of the seismic performance of the new self-resetting node were analyzed.Starting from the influencing factors such as the pre-pressure of the spring return device and the material of the damper,several different nodes were designed to perform finite element analysis and calculation,and the different parameters were compared.The impact of node self-reset performance and energy consumption performance.Finally,the new self-resetting nodes are simplified,and the multi-layer self-resetting steel frame put into the node simplified model and the traditional multi-layer steel frame finite element model that is not put into the node simplified model are established,and the dynamic response of the two under the action of different seismic intensities is analyzed.