Seismic Performance Of Self-Centering Energy Dissipation Damper For Leaf Spring Deformation

The traditional earthquake resistance of buildings is to add flexible components to the frame,and consume seismic energy through its plastic deformation,but it is difficult to meet the requirements of rapid recovery after an earthquake,and it will also lead to excessive residual deformation of the structure,which affects the use of the structure.Therefore,scholars from the United States and Japan and other countries The concept of recoverable function is proposed.In this context,based on the self-center theory,this paper proposes a leaf spring-type self-center energy-dissipating damper,which uses an X-shaped mild steel sheet as the main energy-dissipating device,and the leaf spring provides the restoring force.The main research contents of this paper are as follows:First of all,the validity of numerical simulation is verified.The self-center frame with complete test data was selected,and based on the test,the ABAQUS software was used to conduct displacement loading analysis for its modeling,and the finite element modeling method was explored to verify that it was in good agreement with the test data,which provided a reliable guarantee for subsequent analysis.Secondly,the damper performance is studied.The structure,working mechanism and design parameters of each component of the damper are discussed,the damper is brought into the self-centering frame and the traditional frame model,the frame is analyzed by finite element,and the hysteresis curve,residual deformation curve and skeleton curve are extracted stiffness degradation and energy dissipation coefficient curves are analyzed.The results show that compared with the traditional frame,the residual size of the frame with damper is greatly reduced,and it has good energy dissipation and reset effect.Analysis of the influencing factors of damper performance again.The initial prestress of the leaf spring and the number of energy-dissipating sheets were changed respectively,and the same load and boundary conditions were set for the model to study the effects of prestress and the number of energy-dissipating sheets on the seismic performance.The results show that changing the number of prestressing and energy-dissipating sheets will affect both recovery and energy consumption.Finally,the numerical simulation of the multi-layer steel structure frame with dampers under earthquake action is carried out.The connected element method is used to add the self-centering performance of the frame to the multi-layer frame,and the modal analysis is carried out to determine the Rayleigh damping coefficient of the frame,and then the seismic force is input into the frame for time-history analysis.The results show that the residual deformation of the self-centering frame and the shear force of the base are reduced,which can achieve the purpose of shock absorption.