Comparison between the visco-elastic dampers and magnetorheological dampers and study the effect of temperature on the damping properties

摘要

A number of studies have been carried out to investigate the performance of visco-elastic dampers (VEDs)and Magnetorheological dampers (MRDs) in controlling the seismic response of buildings but very few studiesregarding the effect of temperature on the behavior of those dampers. As the energy absorption properties of theVEDs are dependent on the ambient temperature, excitation frequency and strain amplitude. Severalmathematical models have been investigated for reproducing the experimental behavior of single degree offreedom VEDs and MEDs. Of these, only the fractional derivative model can reflect the influence of temperaturewhich is, however, so complex that it is difficult to apply in structural analysis. In order to verify the effect oftemperature we took two case studies of structural element been damped once using VED and once using MRD.Kelvin-Voigt mathematical model applied and after analyzing the results, the force vs. displacement showed thatMRD achieved a high force capacity and better performance than VED. Furthermore, the effect of temperaturein case of VED observed via plotting the dissipated energy hysteresis at different temperature. Those resultsvalidate the effect of temperature as the lower the temperature the more viscous the dashpot element becomesand hence improved damping, but this is up to a specific low temperature.