Numerical Simulation Of Seismic Performance Of Displacement Amplification Phased Energy-Dissipating Self-Centering Steel Frame Joints

In performance-based seismic design,the deformation ability of building structure is an important indicator to measure its seismic performance and damage degree.The repair problems caused by the residual deformation of the post-earthquake structure will cause huge economic losses.As the key components and weak links in the steel structure,the mechanical properties of the beam and column joints have a great impact on the overall seismic performance of the structure.Therefore,this paper designs a displacement amplification phased energy-dissipating self-reset node,which can ensure the bearing capacity,ductility and energy dissipation capacity of traditional structures while reducing the residual deformation after earthquake.Firstly,based on the concept of seismic resistance of restorable function,this paper proposes a new type of spring self-reducing energy-dissipating beam and column node for the steel frame structure,which provides the restoring force through the high-strength spring,and the mild steel dissipates seismic energy as the energy-dissipating part.Through the parameter design of each component,the expected goal of self-recovery of energy consumption in different seismic fortification stages is realized.Secondly,in order to ensure its feasibility,a framework node with relatively complete experimental data is selected,modeled by ABAQUS,and then the ABAQUS calculation result is compared with the actual data and conclusion,so as to verify the feasibility of numerical simulation software in studying the calculation of self-reset frame nodes.Thirdly,the new type of node is modeled by ABAQUS finite element software,and the interaction,material parameters,boundary load,and load application method in the modeling process are elaborated in detail,and finally the meshing method is elaborated.Finally,in order to study the seismic performance of the new self-centering joint,this paper uses ABAQUS finite element software to establish a simulation analysis of the new steel frame joint with different geometric parameters,steel type,different preload spring and the traditional frame node with the same beam and column size.The energy dissipation coefficient curve was used to explore the influence of different parameters on the seismic performance of the node.