COMPARATIVE STUDY OF THE PERFORMANCE OF FLUID VISCOUS DAMPER AND VISCOUS WALL DAMPER FOR STRUCTURAL VIBRATION CONTROL

Abstract

Designing civil engineering structures to withstand seismic damage remains a significant challenge. Despite extensive efforts in developing earthquake-resistant designs and construction practices, structures are still susceptible to strong earthquake forces. Traditional design approaches have limitations in load resistance and energy dissipation, relying solely on stiffness and minimal damping. These passive structures lack the ability to adapt to the dynamic and unpredictable nature of earthquake excitations. To address this, innovative smart structure technology has emerged as a promising solution since the 1970s. By incorporating devices or systems into the structure, smart structure technology enhances its seismic resistance capacity and dissipates dynamic energy. This technology offers a viable approach to improve the safety and performance of structural systems in seismic conditions. In performing nonlinear time history analysis using CSI ETAB V21, I utilized a nonlinear modeling approach for columns known as the fiber modeling approach, as well as a nonlinear modeling approach for RC beams called the plastic hinge modeling approach. Fluid viscous dampers were provided on each side of the building's center of mass, while viscous wall dampers were used uniformly distributed with equal damping force to the full height of the building along all four sides. Mid-rise and high-rise buildings were used for comparison. By implementing fluid viscous dampers, we observed a reduction of 40-85% in the total base reaction in the high-rise building and 70-80% reduction in the mid-rise building. On the other hand, when employing Viscous wall dampers, a 29-70% reduction was observed in the high-rise building and a 20-40% reduction in the mid-rise building. Various parameters, such as floor acceleration, overturning moment, inter-story drift, Story shear force, were calculated and compared through tabulated and graphical representations. In conclusion, all performance parameters of the analysis show that fluid viscous dampers are more effective in both high-rise and mid-rise buildings.