Abstract
<jats:p>Structural irregularity in reinforced concrete (RC) structures introduces significant challenges in achieving uniform strength and stiffness distribution, making such buildings more vulnerable during strong ground motions. This study focuses on evaluating the performance of various types of vertical and plan irregular reinforced concrete (RC) frame structures located in India‘s most seismically active region, such as Zone V, using nonlinear static pushover analysis. The investigation aims to quantify how variations in structural irregular configuration influence global performance parameters such as maximum storey displacement, base shear capacity, and overall deformation behavior. Following the guidelines of ATC-40 and FEMA-273, a nonlinear static pushover analysis is carried out by incrementally applying lateral loads to the structure until collapse conditions are reached. A detailed parametric study is conducted by varying the different types of vertical irregularity to establish the relationship between irregularity and overall structural performance. The contribution of this work lies in establishing a direct correlation between vertical geometric irregularity parameters and the deformation performance of RC frames through capacity-based pushover evaluation.</jats:p>