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CONTROL OF THE SEISMIC RESPONSE OF A REINFORCED CONCRETE BUILDING USING VISCOUS DAMPERS
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Volume Title: ICASGE2023
DOI: ICASGE-STA
Authors
1Assistant Professor,
Faculty of Engineering
Cairo University
2Graduate Student Faculty of Engineering Cairo University, Egypt
3Professor Faculty of Engineering Cairo University, Egypt
Abstract
Supplemental damping devices are often used to improve the structural performance during seismic loading and control the damage by dissipating the energy. Fluid viscous dampers operate by moving of piston in a viscous fluid, which generates a resisting force. This research studies the effect of using fluid viscous dampers on the seismic response of a six-floor reinforced concrete building. First, three different configurations of dampers are investigated and the building responses in each case were compared. Afterwards, the effect of non-uniform loading on the building response before and after adding the dampers is studied. Nonlinear time history analysis for seven seismic records was performed with nonlinear dampers using commercially available finite element software to compare the results of base shear reactions and roof displacements in each seismic record before and after adding the dampers. All records were normalized so that the peak ground acceleration was 0.15g, which corresponds to the expected acceleration in Cairo. Time history was applied to three models to consider three values of eccentricity in short direction, long direction and both directions of the building to compare the effect of dampers in case of uniform and non-uniform loading with two different configurations of dampers. The results showed that in the majority of cases the dampers provided reductions in the base shear and the roof displacements. This reduction varies reaching up to 44.3% decrease in the base shear force on the building, where the reduction in value depends on the earthquake record, damper configuration, and load eccentricity.
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