This study investigates the seismic performance of a four-story reinforced concrete frame building with irregularities, situated on sloping ground. Recognizing the increasing prevalence of construction on slopes due to population growth and urban expansion, this research employs a step-back model on the sloping terrain at inclinations of 0°, 10°, and 20°. A three-dimensional model of the rectangular building was developed and analysed using SAP2000 software, implementing pushover analysis as per ATC-40 guidelines. The analysis focuses on the impact of sloping ground on structural forces, specifically examining horizontal reactions and bending moments in columns. Preliminary findings indicate that shorter columns experience higher forces due to increased stiffness, resulting in elevated shear and bending moments. Consequently, these columns require design modifications to accommodate the amplified forces. Furthermore, the study examines key dynamic characteristics, including hinge formation, base shear, target displacement, and maximum column moments, comparing results between level and sloping ground conditions.
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