Seismic Performance Analysis Of Lead Core Steel Tube Bearing With Stiffening Ring

The principle of earthquake is due to the collision or extrusion between plates,which will release huge energy and cause serious damage to the surrounding surface and the upper buildings.Therefore,it is of great significance for China’s social and economic development to find an effective anti-seismic form to reduce the degree of earthquake damage.Therefore,we are looking for an effective anti-seismic form to reduce earthquakes.The degree of destruction is of great significance to the economic development of our society.At present,the new seismic isolation technology is more and more recognized by people,among which laminated rubber bearings are the most mature.But with the rising of high-rise building structure in China,laminated rubber bearings have many problems,such as low tensile strength,high price,poor durability and fatigue,complicated production process and so on,which seriously affect the application in practical engineering The popularization and application of this method.The isolation form of stiffening ring lead core steel pipe isolation bearing proposed in this paper greatly makes up for the shortcomings of laminated rubber isolation bearing,and is conducive to the promotion of isolation technology in the actual engineering field.In this paper,the ABAQUS finite element analysis software is used to model and analyze the stiffening ring lead-cored steel tube seismic isolation support,and study the various component parameters that affect the mechanical performance of the seismic isolation support.Then use SAP2000 structural analysis software to establish two calculation models of traditional seismic structure and stiffening ring lead-core steel pipe isolation structure.Analyze the damping effect of the stiffening ring lead-core steel pipe isolation structure under different earthquakes.The research content and conclusions of this article are as follows:（1）Briefly summarize the basic working principle of the seismic isolation structure,and put forward a new type of seismic isolation form of the stiffening ring lead-core steel tube seismic isolation support.The stiffening ring lead-core steel tube seismic isolation support is composed of two metal materials:steel and lead.Among them,the steel has the characteristics of high strength,high vertical bearing capacity,and low horizontal rigidity,Lead core has the characteristics of large damping,no accumulation of deformation and consumption of seismic energy.Based on the form of isolation structure,the dynamic response of isolation structure is analyzed theoretically,and the calculation model of stiffening ring lead core steel pipe isolation bearing is proposed.（2）The model of the stiffening ring lead-cored steel tube seismic isolation support is established using ABAQUS finite element calculation software.First,the constitutive relationship used by each component material of the stiffening ring lead-cored steel tube seismic isolation support is determined,and then the model establishment process The basic steps are briefly explained.Finally,the 7 variable parameters that affect the mechanical properties of the seismic isolation support are modeled and analyzed separately through the ABAQUS finite element software,It mainly includes bearing height H,lead core diameter d,stiffening ring steel pipe wall thicknessδ,bolt diameter d₀,connecting steel plate thickness b,stiffening ring ring thicknessδ₀,stiffening ring ring width s.The design parameters of each component of stiffening ring lead core steel pipe isolation bearing are discussed respectively,The skeleton curve under the design parameters,so as to obtain the initial stiffness,ultimate load,yield load,failure displacement,yield displacement,ductility and other mechanical properties of the seismic isolation support under the three different design parameters.The optimal size of each component of the core steel pipe isolation bearing.Perform nonlinear buckling analysis on the designed stiffening ring lead-cored steel pipe seismic isolation support,thereby calculating the ultimate vertical bearing capacity and ultimate horizontal displacement of the stiffening ring lead-cored steel pipe seismic isolation support,and determining the needs of this topic The minimum number of seismic isolation supports.（3）Using SAP2000 structural calculation software,two calculation models of traditional seismic structure and seismic isolation structure are established respectively.Among them,the mechanical performance parameters of the support obtained by ABAQUS calculation and analysis are input into the seismic isolation structure.Under frequent and rare earthquakes,EL-Centro wave,Taft wave and Synthetic wave are input to the traditional seismic structure and the stiffened ring lead steel tube isolation structure respectively.The dynamic time history analysis method is used to compare the story shear response,story acceleration response and story displacement response of the traditional seismic structure and the stiffened ring lead steel tube isolation structure,so as to verify the damping effect of stiffening ring lead core steel pipe isolation bearing.