Seismic Analysis of Vertical Setback Irregularity in RCC Building
Author(s): Kaushal Saini
Publication #: 2604032
Date of Publication: 25.04.2026
Country: India
Pages: 1-5
Published In: Volume 12 Issue 2 April-2026
Abstract
Earthquake-resistant design of structures has become a critical aspect in civil engineering due to increasing seismic activities and urbanization. This research focuses on the seismic performance of reinforced cement concrete (RCC) buildings with vertical setback irregularities. Setback structures, where the building geometry changes along height, lead to irregular distribution of mass, stiffness, and strength, making them more vulnerable to seismic forces. In this study, a G+10 storey RCC building is analyzed using the Equivalent Static Method as per IS 1893 (Part 1): 2016. Multiple models with different setback configurations are considered and compared based on parameters such as storey displacement, storey drift, base shear, and torsional effects. The results indicate that vertical irregularities significantly influence seismic behavior and must be carefully considered during design.
Keywords: Earthquake, Seismic analysis, structure performance, torsional stresses, deformation
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