AN ANALYSIS OF VISCOUS DAMPERS IMPACT ON CONTROLLING THE VIBRATIONS IMPOSED ONSEISMIC VIBRATIONS

In the present paper, the impacts of viscous dampers on controlling the vibrations imposed on seismic vibrations are evaluated using descriptive method. To this end, library method and other researches related to viscous dampers and their impacts on controlling the external excitation such as earthquake have been used. ETABS software was used for modeling the structures. Also, nonlinear dynamic analysis was used for seismic analysis of the structures. Based on the findings, using viscous dampers are effective to improve seismic parameters of structure and to decreasedisplacement, speed, base shear, and velocity. On the other hand, viscous fluid dampers can strengthen structure and its performance during severe earthquakes and can be applied in newly constructed structures. The impact of passive viscous damper on reducing seismic response of the structures is found significant at the confidence level of 90%.Reduction of energy of structure hysteresis because of the nonlinear behavior of members using dampers is proved to be significant at the confidence level of 80%.The results reveal that the lateral resistance of an EBF with short joint can be 4/5 to 9 times more than the lateral resistance of a MRF, that behavior coefficient of fifteen-story EBF considered 6/5-7/75, concluded that the length of the bray does not have an impact on the behavior coefficient of these frames.