Research And Application Of The Seismic Performance Of A New Type Of Diamond-shaped Cross-section High-efficiency Energy Dissipation Brace

Earthquakes can easily cause severe damage or even collapse of structures,and the repair work of buildings after an earthquake is extremely difficult.With the development of society,people have put forward more stringent requirements on the safety and applicability of seismic design of buildings.The support of energy dissipator as a typical application of energy dissipation and shock absorption design came into being.At present,the materials and forms of energy dissipator support have been deeply studied by scholars at home and abroad,and many energy dissipation devices with different energy dissipation characteristics and different forms have been issued.This paper refers to the design idea of a metal energy dissipator with in-plane bending yield,and proposes a new type of open-hole shear type energy dissipator support and its performance is studied in order to provide theoretical support for future design work.Using the ABAQUS finite element software to perform a finite element analysis on the support of the new open-hole energy dissipator,the length l,the end section height h₁,the middle section height h₃ and the thickness t are obtained.,The influence of stress distribution and hysteretic energy dissipation performance.The analysis results show that the length of the opening l is a key factor affecting the load-bearing capacity and hysteretic performance of the energy dissipation support.As the length l increases,the elastic stiffness,yield bearing capacity,ultimate bearing capacity,total energy dissipation,and equivalent damping ratio of the support decrease,while the yield displacement,ultimate displacement,and strong yield ratio increase.The finite element simulation results show that the new type of energy dissipation brace has strong bearing capacity,uniform stress distribution,full hysteresis curve,and excellent energy dissipation performance.Through the comparative analysis of the finite element results:this paper recommends that the length l is 40～100mm,the ratio of the end section height h₁ to the length l is less than 0.25,the middle section height h₃ and the end section height h₁ is 0.5～0.6,and the thickness t is 8～10mm.Use the SAP2000 software to analyze the seismic performance of the energy-consuming support and reinforcement structure.The original frame structure does not meet the requirements of seismic codes and needs to be reinforced with energy dissipation support.By comparing the vibration mode,period,layer displacement and inter-layer displacement angle before and after structural reinforcement,it is found that the structure period type and inter-layer displacement angle after using energy dissipation support can meet the specifications.It shows that the energy dissipation support can effectively improve the seismic resistance of the structure.