Analysis On The Damping Effect Of New Type Lead-filled Steel Pipe Isolation Bearing

Earthquake is a devastating natural disaster,threatening the safety of human life and property,the collapse of houses caused by disasters,is the main cause of casualties and economic losses.Engineering seismic experts continue to strive to actively find effective forms of structural seismic,isolation technology has become a new trend in the field of seismic development.At present,the most mature in the field of isolation is the development of laminated rubber isolation technology,but because of the high cost of the technology,insufficient tensile strength,high production process requirements,and not widely used in practical engineering.Under this background,this paper puts forward a new type of lead steel rod isolation technology,which has the characteristics of low cost and stable performance,which can effectively make up for the defects of laminated rubber isolation technology and promote the wide use of isolation technology in engineering field.In this paper,the calculation model is established by using ABAQUS and SAP2000 software,and the mechanical properties of the new lead steel rod isolation bearing and the isolation effect of the new type of lead steel rod isolation structure are simulated and analyzed,and the results show that the new type of lead steel rod isolation bearing has excellent mechanical properties and can act as an isolation member in the isolation structure.The isolation structure under the action of the isolation bearing of the new lead steel rod has obvious damping effect.The main content of this paper is divided into the following three aspects:?1?Theoretical analysis of isolation structure.The theoretical analysis of isolation structure determines the number of isolation support in this paper,and draws the conclusion that the equivalent damping ratio can be adjusted to control the dynamic response of the structure.It mainly includes the theoretical analysis of isolation layer: the analysis of horizontal seismic action of isolation layer,the analysis of horizontal stiffness,the analysis of bearing capacity and the determination method of the number of isolation support,the theoretical analysis of dynamic response of isolation structure: acceleration reaction analysis,interlayer displacement reaction analysis.?2?elastoplastic analysis of the isolation bearing of the new lead steel rod.Finite element simulation analysis,the influence of various influencing factors on the mechanical properties of the isolation bearing is obtained: The bolt radius r₀ and the thickness of the connecting steel plate b₀ The influence on the energy dissipation capacity under the premise of ensuring the strength and stiffness of the support and the ground girder connection,and the process of lead radius r increasing from 30 mm to 50mm decreases first.The smaller the thickness b of steel wall,the greater the equivalent damping ratio,the higher the height h of the bearing,the smaller the equivalent damping ratio,and the parameters of the isolation bearing in the example of this project r₀=15 mm,b₀=12mm,r=40 mm,h=200 mm,b=6 mm.?3?Time history analysis of multiple earthquakes and rare earthquakes in 8degree area.In this paper,the traditional seismic structure and isolation structure are fed into El-Centro wave,Taft wave and 1 artificial waves,and the interlayer shear reaction between the two structures is analyzed,and it is concluded that the damping coefficient of the new lead steel rod isolation structure is less than 0.3,which has a good damping effect.