In today’s construction, multi-storey commercial buildings are designed in different shapes based on architectural needs. The shape of a building plays an important role in its structural behavior, especially during earthquake and lateral load conditions. Regular shaped buildings like rectangular plans generally perform better, while irregular shapes like L-shaped buildings may face problems such as torsion and uneven load distribution. In this project, a G+8 commercial RCC building with two different configurations, rectangular and L-shaped, is modeled and analyzed using STAAD. Pro. Both structures are designed with beam size 600×850 mm and column size 950×1200 mm, and analyzed under dead load, live load, and seismic load conditions as per IS codes. The results are compared in terms of bending moments, shear forces, axial forces, displacements, and support reactions. From the analysis, it is observed that the rectangular building shows more stability and uniform load transfer, whereas the L-shaped building experiences higher displacement and torsional effects near the corner areas. This study helps in understanding the influence of building shape on structural performance and safety.
