Abstract: The way a multi-story building behaves during intense seismic activity is determined by its structural design. One of the main reasons for failure during earthquakes is recognised to be irregular configuration, either in plan or in elevation. Therefore, irregular structures are a cause for concern, particularly those found in high seismic zones. The present study addresses the seismic response of reinforced concrete structures with regular and irregular configurations. A G+12-storey building with a regular frame and an irregular frame with various irregularities is designed and they are analyzed and compared. The study's investigation of the seismic performance of Arunachal Pradesh, India, has been the main emphasis. The building is designed as per IS 456: 2000 and IS 1893(Part I): 2016. Seismic evaluation is carried out in finite element-based software ETABS. Equivalent Static Analysis and Response Spectrum Analysis are used for seismic analysis of the building where the results of Storey displacement, Storey drift, Storey stiffness, Modes, and Base shear will be compared and evaluated. Results show that the vertical geometric irregularity model is more efficient than the other models and the re-entrant corner irregularity model is the least stable.

Keywords: Irregular building, Response spectrum analysis, Storey displacement, Storey drift, Base shear

| DOI: 10.17148/IARJSET.2024.11658