International Journal of Science, Engineering and TechnologyAuthors: Amool, Shivakumar kalgi, Sharankumar S. Gobbr, Brijbhushan S, Maneeth P D
Abstract: Irregular buildings are highly vulnerable to seismic and wind-induced lateral forces due to unsymmetrical stiffness and mass distribution, often resulting in excessive displacements, drifts, and uneven axial load transfer. This study evaluates the effectiveness of advanced structural control systems—shear walls, viscous dampers, and combined damper–isolator systems—in improving the lateral performance of irregular reinforced concrete buildings. A G+10 irregular RC frame was modeled and analyzed in ETABS under IS 1893:2016 provisions. The performance parameters considered include story displacement, drift, axial loads, and base shear. Results show that the shear wall configuration, though reducing axial forces, produces the maximum displacements and base shear, rendering it unsuitable for irregular layouts. The damper-only system achieved the best performance, reducing displacements by up to 41% and keeping drift values well within IS code limits. The damper–isolator system showed a balanced response but introduced localized axial load spikes, requiring careful detailing. Overall, viscous dampers perform as the most effective and practical retrofit strategy for irregular buildings, ensuring enhanced safety and serviceability without significantly increasing seismic demand.
DOI: http://doi.org/10.5281/zenodo.20801224
