Finite Element Analysis Of The Performance Of A New Type Of Truncated Lead Viscoelastic Damper (TLVD)

The characteristic that low ductility shear failure occurs easily in small span-depth ratio coupling beams in coupled shear walls under the effects of earthquake is viewed.In order to avoid or delay the premature failure of the coupling beam,which makes coupling beams lose the function of connecting the two ends of the wall limb.In this paper,a new type of truncated lead viscoelastic damper(TLVD)was proposed primarily and which was used for improving the seismic performance of small span-depth ratio coupling beams,the research work of the damper was carried out,and the influence of TLVD on structure is also analyzed further.According to the new type of truncated lead viscoelastic damper(TLVD),the structural parameters which may affect its mechanical properties were preliminarily determined.In view of these parameters,16 sets of simulated specimens were designed,and then the finite element analysis was carried out.Finally,the influence of structural parameters on the energy dissipation performance,characteristic parameters and stress distribution of TLVD was explicit by analyzing the simulation results,meanwhile,the resilience model was determined by the skeleton curve.The results show that truncated lead viscoelastic damper(TLVD)not only have symmetric hysteresis curve,stable hysteresis performance and large deformation ability,but also there is not obvious stress mutations phenomenon,the double linear model can be used to describe its resilience model.Under the cyclic displacement load,the number and diameter of lead core of TLVD and the yield of bolt hole affects the energy dissipation capacity of TLVD comprehensively,The diameter of lead core should be controlled between 35 mm and 55mm;TLVD with five lead core can obtain stronger energy dissipation capability;the ratio ? of the sheet steel to the single rubber layer thickness should be controlled between 0.4 and 0.7;the rubber shear modulus G should be controlled between 0.4 MPa and 0.6 MPa,however,the selection of structural parameters in practical engineering should be based on the specific needs.The truncated lead viscoelastic damper(TLVD)was applied to a shear wall residential building which formed an energy dissipation structure.The mode analysis,general response analysis and time history analysis of the original structure and energy dissipation structure with TLVD were carried out respectively by using ETABS software.The resultsshow that no matter under the frequent or the rare earthquake,the energy dissipation structure with TLVD has been effectively controlled in the story drifts,roof acceleration compared with the original structure,the story drift angle reduces by about 13% and 16%respectively,and they meet the requirements of the code,and the roof acceleration reduces by about 57% and 63% respectively.