Mitigation of seismic response of dual eccentrically braced steel frames equipped with fluid viscous dampers

Abstract

Although the benefits of equipping the moment resisting frames with fluid viscous dampers have been shown by numerous studies, so far the utilization of these devices in the case of dual eccentrically braced steel frames has not been identified. A numerical investigation has been carried out in this paper considering the seismic response of a 3D five-story steel structure, with perimeter dual eccentrically braced frames, situated in Iași. The structure has been analyzed in several cases: unequipped and equipped with fluid viscous dampers that provide different damping ratios. The numerical results (maximum base shears, inter-story drift ratios, lateral story accelerations, and links rotations) has proven the efficiency of the fluid viscous dampers for the seismic protection of dual steel frames.