Seismic Analysis Of G+20 Irregular Building With Top 5 Floor Swimming Pool
Keywords:
Comparative Analysis, Multi-story Structures, Response Spectrum Method, Mass distribution, Top floor, Swimming Pool, Seismic AnalysisAbstract
This study focuses on the seismic analysis of a G+20 irregular building with a top 5- floor swimming pool, utilizing the Response Spectrum Method in ETABS software for seismic evaluation in Seismic Zone V. The building’s irregularities, especially due to the presence of a swimming pool at the upper floors, were carefully modeled to simulate their effect on the building’s seismic response. The analysis aimed to evaluate the displacement, overturning moments, base shear, and storey drift under seismic loading conditions, considering the dynamic interaction between the swimming pool and the building structure. The study shows that the irregular geometries, particularly in the Squared-shaped, C-shaped, I-shaped and L-shaped configurations, lead to higher displacement and torsional effects when subjected to seismic forces, while the square- shaped building exhibited the best performance in minimizing these effects.
The findings from the seismic analysis demonstrate that although the addition of a swimming pool increases the seismic response, all structural configurations remain within the permissible limits prescribed by IS 875 and IS 1893-2016. The response spectrum method in ETABS provided a comprehensive understanding of the building's behavior under seismic loading, including the influence of irregularity and additional loads from the swimming pool. The results highlight the importance of incorporating dynamic effects such as base shear, overturning moment, and storey drift when designing tall buildings with additional loads like swimming pools, ensuring structural integrity and stability in high seismic zones like Zone V.
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All four structural shapes show an increase in displacement with the addition of a swimming pool, with the L-shape experiencing the greatest rise of 5.5%. Despite these increases, all displacements remain within the allowable limits specified by IS 16700-2017, ensuring the overall stability of the structures.
The square shape exhibits the smallest increase in displacement at 3.2%, highlighting the efficiency of symmetrical structures in managing additional loads. Irregular shapes like the C, I, and L shapes show larger displacement increases, with the L-shape seeing the most significant rise due to its asymmetrical design.
Each structural shape shows an increase in overturning moment with the addition of a swimming pool, with the L-shape experiencing the highest rise at 4.0%. Despite these increases, all structures remain stable and within their design limits, demonstrating their ability to manage additional torsional forces effectively.
The square shape shows the smallest increase in overturning moment at 2.5%, indicating its superior ability to resist torsional effects. Irregular shapes, such as the C, I, and L shapes, experience higher increases, with the L-shape being the most affected due to its asymmetry and irregular geometry.
All four structures show a decrease in storey drift with the addition of the swimming pool, with the L- shape experiencing the highest reduction at 5.0%. The added mass from the pool helps stabilize each structure by improving load distribution and reducing lateral displacement.
The square shape shows the smallest decrease in storey drift at 3.5%, while more irregular shapes like the C, I, and L shapes experience greater reductions. The L-shape benefits the most from the added pool mass, which effectively mitigates its inherent lateral displacement.
The square shape exhibits the lowest base shear, demonstrating its superior resistance to lateral forces due to its symmetrical design. In contrast, the L-shape experiences the highest base shear, caused by its irregular geometry that amplifies torsional effects and increases shear demand.
The C and I shapes show moderate increases in base shear, with the I-shape experiencing a more significant rise of 25% due to its slender form. While the swimming pool's influence on base shear is minimal, the shape's inherent properties still significantly impact shear resistance.
The addition of a swimming pool results in increased displacement and overturning moments across all shapes, with the L-shape showing the largest increase in both parameters. Nonetheless, all structures remain within allowable limits, demonstrating that even irregular shapes gain additional stability from the pool.
The square-shaped structure performs the best overall across all parameters, showing the lowest increases in displacement and overturning moment. Its symmetrical design provides optimal resistance to lateral forces, making it the most efficient structure when subjected to additional loads such as a swimming pool.
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IS 875 : 2015 - “Indian Standard Code of Practice for Design Loads (Other than Earthquake) for Buildings and Structures”, Bureau of Indian Standards, New Delhi - 110002, April 2015.
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