Research On Mechanical Properties Of Bending Lead Ring Damper

Earthquake is a common destructive disaster,once it occurs,it will have a great impact on human life,social stability and economic development.In order to avoid the serious impact of earthquake,how to improve the seismic performance of building structures has been widely concerned by scholars at home and abroad.Through the installation of energy dissipation elements in the building structure,the stiffness of the structure is improved,and the ductility of the building structure is increased,so as to achieve the purpose of earthquake resistance of the building structure.As a passive energy dissipation element,the damper has been designed by shear or extrusion deformation in the past to achieve the energy dissipation effect.In this paper,the whole lead ring is designed by the way of making the lead ring produce the compression and bending deformation.A new type of lead damper-compression and bending type lead ring damper is presented,and its influence parameters are analyzed.At the same time,its effect on earthquake resistance of building structure is studied.The main contents of this paper are as follows:(1)the main contents of this paper are as follows:(1)the design of the damper model.Firstly,based on the passive control theory,a new type of damper,the pressure-bending lead ring damper,is designed,and its working principle and the form of each part of the members are expounded.On the basis of finite element theory,by changing the way of single parameter,the influence factors that may affect lead ring are analyzed one by one,including the radius of section chord length,width,thickness,loading period and cycle number of lead ring.The influence of these parameters on the energy dissipation performance of lead ring is analyzed.There is a positive correlation between the width and thickness of the lead ring and the energy dissipation capacity of the damper;with the increase of the chord length of the lead ring section(the flatter the lead ring),the energy dissipation capacity decreases.And the loading period and the number of cycles have little effect on the energydissipation performance.Secondly,the bending type lead ring damper is improved.The upgrading and improvement of the original design,the application of "restraint hoop" to the waist of the lead ring,and the use of the "collar" not only restrict the lateral deformation of the lead ring,and avoid the "lantern" damage.It also greatly improves the energy dissipation performance and bearing capacity of the lead ring.Finally,the connecting member is installed and the whole lead ring is analyzed.The hysteretic loop obtained is fuller,which shows that the compression bending type lead ring damper has a better energy dissipation effect.(2)Analysis of the influence of the bending type lead ring damper on the building structure.A new type of damper,pressure-bending lead ring damper,is used as energy dissipation element and installed in building structure.By using time history analysis,the energy dissipation structure with dampers and the pure frame structure without dampers are studied in this paper,and the energy dissipation structure with dampers and the pure frame structures without dampers are studied by using time history analysis.It is found that the energy dissipation structure is less than the pure frame structure in acceleration,displacement,shear force and column axial force,and the seismic control effect is good.