Experimental Study Of The New Viscoelastic Dampers

Viscoelastic damper is a kind of common passive damping device.It has wide application prospect.At present,the experimental research of domestic viscoelastic dampers is mainly aimed at small deformation,and the experimental results show that the mechanical properties of viscoelastic materials are affected by temperature and frequency.In this study,a viscoelastic material having a loss factor of 0.5 was developed,and a new Chinese made viscoelastic damper was developed based on the material.The theoretical and experimental investigation on this domestic viscoelastic damper,and the verification of mechanical model and the connection design of the damper are carried out.The main research contents include:(1)Experimental study of the Chinese made viscoelastic damper was conducted by using scaled and full scaled specimen.The test results suggest that the loss factor is about 0.5 for most cases,the dependence of the damper's mechanical properties on temperature is not significant,and the dependence on frequency is small.The energy dissipation capacity is stable under both small and large loading amplitudes,and the damper does not failed when loaded up to 350% loading amplitude.It is also found that the damper exhibits satisfactory low cycle fatigue behavior,since its mechanical behavior does not change much after 30 cycles of loading.(2)The mechanical model is verified by a new domestic viscoelastic dampers.,it is concluded that the Kelvin model can simulate the mechanical changes of the new viscoelastic dampers well.The calculation model of viscoelastic damping device is analyzed,and the influence of the support stiffness on the performance parameters of the damper.The results show that the performance of viscoelastic dissipation is related to the stiffness of the support.In the case of high rigidity,the influence of the support stiffness on the support device can be neglected.(3)By using MIDAS/GEN software,the reinforced concrete frame model is used to compare the seismic response of different viscoelastic dampers with different structures under the frequent earthquakes and rare earthquakes.It is concluded that the energy dissipation structure of viscoelastic damper can effectively reduce the seismic response of the structure.Among them,the wall bracing structure has the best control effect,which can obviously improve the seismic performance of the structure.(4)The connection design and installation construction requirements of wallsupported viscoelastic damper are studied to be quickly assembled at the construction site or quickly replaced after an earthquake,so the specific calculation method and installation construction measures are provided.By using SAP2000,three different strong bracing structures are studied.It is concluded that the structure in the middle of the structure is superior to that of the wall supports the adjacent column and the high cantilever wall.In addition,the seismic response of the shear wall structure model in the earthquake action is established through MIDAS/GEN.The results show that the wall-supported viscoelastic damper has good damping effect on the frame-shear wall structure.