• RATNAKALA PURUSHOTTAM BORKAR
• VINAYAK DAMODAR VAIDYA

This study uniquely investigates the seismic resilience of reinforced concrete (RCC) buildings under seismic zone III conditions, focusing on the interplay between aspect ratios and soil types. Using the Indian seismic code IS 1893 (Part 1): 2016 as a standard, we examined RCC building models with varying aspect ratios (1:1, 1:2, and 1:3) across three soil categories: hard (Type I), medium (Type II), and soft. The analysis assessed key seismic parameters such as base shear, natural frequency, displacements, inter-story drift, and specifically axial forces and bending moments in the Y and Z directions, as well as support reactions in corner (C1), outer centre (C2), and centre (C3) columns. Our results indicate a stabilizing effect on axial forces and bending moments as the aspect ratio increases, especially under soft soil conditions where these forces tend to vary more at lower aspect ratios. Buildings with an aspect ratio of 1:3 showed the most uniform load distribution and minimal seismic force variations, effectively reducing vulnerability. In contrast, models with 1:1 and 1:2 aspect ratios displayed higher sensitivity to soil conditions, with the centre column (C3) being the most affected in terms of bending moments and axial forces. The findings highlight the amplifying effect of soft soils on seismic responses, resulting in greater variability in axial forces and bending moments compared to hard and medium soils. Furthermore, the support reactions—specifically force in the Y-direction and bending moments in the Mx and Mz directions—exhibited significant fluctuations in soft soils, particularly in the centre column. Hard soil conditions, while reducing force and moment variability, increased structural rigidity, potentially limiting energy dissipation during seismic activity. In conclusion, for seismic zone III regions, an optimized aspect ratio of 1:3 combined with a strategic approach to soil considerations—particularly soft soils—is essential for enhancing RCC building resilience against seismic forces. These findings contribute valuable guidance for structural engineers aiming to design RCC structures with improved seismic performance by carefully balancing aspect ratios, soil types, and seismic load responses.

Seismic Analysis, RCC Buildings, Aspect ratio, Soil Types, Seismic Zone III, Structural performance, Axial force, Bending Moment, Support Reaction.

"Seismic analysis of RCC building with different soil types and different aspect ratio in zone III", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 11, page no.a323-a339, November-2024, Available :http://www.jetir.org/papers/JETIR2411036.pdf

"Seismic analysis of RCC building with different soil types and different aspect ratio in zone III", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 11, page no. ppa323-a339, November-2024, Available at : http://www.jetir.org/papers/JETIR2411036.pdf