Abstract: - The seismic performance of multi-story buildings is critically influenced by their structural configuration. This study presents a comparative analysis and design evaluation of regular and irregular reinforced concrete (RC) framed structures subjected to seismic forces across two seismic zones—Zone III (moderate) and Zone V (very severe)—as defined by IS 1893 (Part 1): 2016. The objective is to assess how geometric irregularities in plan and elevation impact structural response under dynamic loading conditions. Two G+17 RC buildings, one with regular configuration and another with irregularities (L-shaped plan and vertical mass/stiffness variation), were modeled and analyzed using ETABS 2017. The analysis was conducted using equivalent static and response spectrum methods, with parameters such as storey displacement, storey drift, base shear, stiffness, and modal time period evaluated. The results show that irregular configurations exhibit significantly higher lateral displacements, storey drift, and reduced stiffness compared to regular ones, especially under Zone V seismic conditions. Regular buildings demonstrated better seismic performance due to their uniform mass and stiffness distribution, leading to more predictable dynamic behavior.
Beniwale et al. (Mon,) studied this question.
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