Performance Test And Simulation Analysis Of A New Type Of Plate-type Viscoelastic Dampe

In view of the more extensive application of viscoelastic dampers in energy dissipation and shock absorption design and the problems existing in the application of viscoelastic dampers in China,research work has been carried out from new materials,neotectonics and new restoring force models,and it is expected to solve the problems in the application of viscoelastic dampers to a certain extent.Basic mechanical and fatigue performance tests were conducted on viscoelastic dampers made of three different types of new viscoelastic materials.Five specimens were used for each material,totaling 15 specimens.The experimental results were observed and analyzed,and the frequency correlation,deformation correlation,strain correlation,fatigue performance,and uniaxial tensile performance of the dampers were studied.Analyze the experimental results using stored shear modulus,energy dissipation shear modulus,equivalent viscous damping ratio,loss factor,energy dissipation,and maximum damping force.The research results indicate that the damper has good working performance,full and symmetrical hysteresis curve,and strong energy dissipation ability.Finally,suggestions for material selection are provided.The optimal material to choose is V3 material.A corrugated viscoelastic damper was proposed and three different forms of corrugated structures were designed.Based on the experimental results of the viscoelastic damper made of V3 material,the hysteresis performance of V3 material was input as a material parameter into the finite element analysis software as the viscoelastic material for the new type of plate viscoelastic damper,Then,a total of120 working conditions with strain amplitudes of 50%,100%,150%,and 200% under a 0.1Hz loading frequency were simulated and analyzed for the 30 sets of finite element analysis models designed.The results show that the hysteresis curve of the new plate type viscoelastic damper is full and symmetrical,and the energy dissipation effect is good.The influence of various design parameters on the performance of the damper is given through the analysis results.On the basis of performance testing and simulation analysis of dampers,a restoring force model under conventional loads was constructed using the existing connection elements in the current seismic analysis software ETABS based on material characteristics and hysteresis curve characteristics,and corresponding parameter definition methods were provided.The new plate viscoelastic damper BBVD2 with this restoring force model is applied to an actual frame structural engineering for seismic analysis and comparison with the seismic response of the original structure.The results show that compared with the original structure,the results of BBVD2 installation can be effectively controlled in the top floor acceleration,inter story displacement angle and member internal force,and the effect of energy dissipation and vibration reduction is remarkable.And the hysteresis curve of shock absorption analysis indicates that the proposed restoring force model can accurately describe the performance characteristics of viscoelastic materials.