Study On The Design Method Of Metal Dampers For Shear Wall Coupling Beams

Coupling beam is the very important component in shear wall structure.In the past several strong earthquakes around the world,the coupling beams have suffered varying degrees of damage.In the future,lots of shear wall structures will be built in the city of skyscrapers,and the structure forms will become more and more complicated.More and more damage of coupling beam may appear with the earthquake occurrence,which will endanger he human life and property safety.Many scholars have designed and tested coupling beam dampers of shear wall structures,but there is no unified theory for the design of coupling beam dampers.In this paper,a design method of metal dampers for coupling beam is presented,the finite element models of the original coupled shear wall structure,the coupled shear wall structure with metal damper in the middle of coupling beam and coupled shear wall structure with metal damper in this method are established by ABAQUS.The elastic-plastic time history analysis is used to compare the seismic performance of different structures.The main contents of this paper are as follows:1.Taking the coupled shear wall as an example,the deformation and mechanical characteristics of the coupling beam are analyzed.The influence of the relative vertical displacement caused by the wall deformation at the section of the coupling beam is analyzed with the continuous connecting rod method,and the relationship between this vertical displacement and the story drift is deduced.2.The bending and shearing metal dampers are simulated by ABAQUS.The hysteresis curves of the dampers conform to the bilinear model.Based on the bilinear model of metal dampers,a variable stiffness design method of metal dampers for connecting beams is proposed by analyzing the deformation of energy-dissipating coupling beams after installing metal dampers.3.A relatively regular shear wall structure is designed by Midas,and a shear wall is selected from it and the story drift is calculated with response spectrum by ABAQUS.The stiffness of metal damper is designed by iterative calculation,and the parameters of dampers are transformed into stress-strain relations of Truss element for simulating metal dampers in ABAQUS.At the same time,according to the principle that the sum of stiffness for metal dampers along the whole height is equal,the damping structure for comparison is designed.4.The finite element models of three structure are established by ABAQUS.The elastic-plastic time history analysis of three structures under various earthquakes is carried out.The shear force and bending moment at the bottom of foundation,story displacement,strain and damage of different parts of the structure are compared.The superiority of the seismic performance of the coupled shear wall structure with metal damper in this method is revealed,and the feasibility of the design method of metal dampers for connecting beams in this paper is verified.