Abstract
The aim of the paper is to assess the efficiency of viscous fluid dampers with toggle bracing mechanism in reducing the seismic response of rigid steel frame structures.
A five story, three bay rigid steel frame was chosen for this study as a reference frame. The structure was then equipped with linear fluid viscous dampers, installed with the toggle brace configuration in the central bay of the building.
The dampers were sized to provide 15%, 25% and 35% of critical damping in the fundamental mode.
The numerical results (peak story shear, peak interstory drift and peak lateral floor acceleration) show that the proposed device is usefulness in enhancing the seismic response of stiff structure.
KEYWORDS: toggle brace system, viscous damper, damping ratio, time history.
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