Study The Impact of using Viscous Fluid Dampers in Steel Buildings Subjected to Seismic Load

The aim of the present work is to reduce seismic response of structures using passive vibration control system namely Fluid viscous dampers in SAP2000. The buildings with 8 floors are considered for the study and the structures are subjected to seismic excitations on steel Building with& without bracing and dampers. The reductions in seismic response were compared. The Bhuj 2001earthquake data is used as ground motion data for performing nonlinear time history analysis. The dampers are installed in the structures only in the exterior frames. In recent years considerable attention has been paid to research and development of structural control devices with particular emphasis on diminish of wind and seismic response of buildings. In order to control the vibration response of building during seismic events, energy absorbing passive damping devices are most commonly used for energy absorption. The present work deals in reducing the seismic response using fluid viscous dampers connected to Steel Bracing for 8 floors when subjected to a seismic excitation of Bhuj 2001 earthquake ground motion. It is considered a regular steel structure with 3 variants of confirmation: Normal Steel Building, Steel Building with ‘X’ Bracing and Steel Building with Dampers. Nonlinear time history analysis has been performed for structures and observed the reduction in seismic response. Parameters studied are roof displacements, storey drifts and base shears. SAP2000 software analysis engine is used as the software tool for the seismic analysis of the structure. Roof displacements decreased highly to an extent of 70% and 21% compared to normal steel building and building with X bracings respectively. The result analysis shows a reduction of 53-65% in base shear and 31-14% in storey drift for structures equipped with fluid viscous when compared to normal steel building and building with X bracings respectively. It expresses that providing bracings with damper in outer frame of structure is more efficient than structure with only dampers.