Design And Performance Optimization Of New Structure Mild Steel Damper

Earthquake disasters have caused huge losses to the safety of human life and property.The application of energy dissipation and shock absorption technology can greatly reduce the seismic response of the structure,thereby protecting the safety of the main structure.Due to its outstanding advantages,soft steel dampers are widely used in research and application at home and abroad.In this paper,in view of the shortcomings caused by the welding of traditional soft steel dampers,a new type of prestressed bending soft steel damper is proposed.Combining theory,experiment and finite element simulation analysis methods,this paper studies the characteristics of this soft steel damper The main contents of the feasibility and related mechanical properties are as follows:In the elastic range,the basic parameters such as yield shear force,yield displacement,initial stiffness,ultimate shear force and minimum neck width of X-shaped and hollow diamond-shaped energy-dissipating steel plates are derived through theory.The fatigue performance of the energy-consuming steel plate,the film effect,the basis for applying prestress values,and the restoring force model are studied.Test and verify the prestressed bending soft steel damper,and compare the tests with different prestressed dampers and traditional welded dampers.The results show that the hysteresis curve of the prestressed bending soft steel damper is full and the energy dissipation ability is good.To verify the feasibility of this new type of construction damper.Aiming at the problem of prestress loss caused by the relaxation of prestressed steel strands in the test,the analysis is caused by the processing of the test piece,and an improved method for applying prestress is proposed.The yield force,yield displacement,and initial stiffness of X-shaped and hollow diamond-shaped steel plates with different neck widths are analyzed,and the relationship between the yield force of X-shaped and hollow diamond-shaped steel plates and the initial stiffness and neck width is obtained,and the reasonable steel plate is designed.size.The hysteresis characteristics of X-shaped and hollow diamond steel plates with different thicknesses were studied,and the difference in mechanical properties between the two was compared.The results show that the hollow diamond steel plates have better mechanical properties and more consumption.The vertical axial force of steel plates with different thicknesses and aspect ratios is analyzed,and the influence rule of axial force on the performance of the steel plate is obtained,and the estimation formula of the minimum prestress is given.The improved structure of X-shaped and hollow diamond-shaped steel plate damper model was established by ABAQUS finite element software.The stress development of the hollow diamond-shaped damper energy-consuming steel plate under different boundary conditions was analyzed.The analysis showed that: the axial free damper The hysteresis curve is full,and the energy dissipation performance is stable.The axial force under the axial constraint is more obvious.The too small prestress will make the damper’s fastening force insufficient,the height direction will be loose,and the excessive prestress will affect the axial force.Get bigger.The conclusions of the finite element analysis are in good agreement with the test,and the finite element model can better reflect the mechanical properties of the damper.