Mechanical properties of single-layer and multi-layer amplified viscoelastic dampers
To improve the energy dissipation efficiency of viscoelastic dampers,three kinds of amplified viscoelastic dampers were designed employing a lever displacement amplifier,namely,single-layer amplified viscoelastic damper,multilayer amplified viscoelastic damper and multilayer bidirectional amplified viscoelastic damper.On the basis of the linear Kelvin model,an improved nonlinear NLKelvin model was proposed to describe the nonlinear mechanical properties of the damper,and the corresponding mechanical model was established.Mechanical performance tests of the single-layer amplified damper and the ordinary viscoelastic damper were carried out.The test results show that the damping force and energy dissipation of the single-layer amplified damper are significantly improved,with the damping force being 5.41 times higher than that of the ordinary damper and the energy dissipation being 3.09 times higher than that of the ordinary damper.The test hysteresis curves are in good agreement with the nonlinear NLKelvin model.Dynamic time response analysis of a 7-story concrete frame with the four different damping schemes was carried out,and it is found that the response control ability of the proposed large-scale damper is significantly better than that of the ordinary viscoelastic damper.The displacement damping rates of the structure with single-story,multi-story,and multi-story bidirectional large-scale damper are 12.8％,32.5％,and 53.6％,respectively,and the additional damping ratios are 2.9％,4.8％and 6.1％,which further verifies the good damping performance of proposed devices.
国家科技期刊平台
NSTL
万方数据
维普
