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Structural Engineering and Mechanics Volume 91, Number 5, September10 2024 , pages 487-502 DOI: https://doi.org/10.12989/sem.2024.91.5.487 |
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Proposing a multi-mushroom structural system for enhanced seismic performance in large-plan low-rise reinforced concrete buildings |
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Mahmoud Alhashash, Ahed Habib and Mahmood Hosseini
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| Abstract | ||
| This study introduces a novel 'multi-mushroom' structural system designed to improve seismic performance in lowrise buildings. Traditional low-rise structures tend to favor sliding over rocking due to their smaller aspect ratios despite the rocking system's superior seismic response reduction. Rocking designs allow structures to pivot at their base during seismic events, reducing damage by dissipating energy. The proposed multi-mushroom system divides the building into four equal sections with small gaps in between, each capable of independent rocking. Numerical analyses are conducted using scaled earthquake records from far- and near-source events to evaluate this system's performance. The results indicated that the multimushroom system significantly reduces plastic hinge formation compared to conventional designs. The system also demonstrated enhanced beam performance and a robust base girder, contributing to reduced collapse vulnerability. The 3-story model exhibited the most favorable behavior, effectively mitigating peak roof drift values, where the rocking system achieved a 21% reduction in mean roof displacement for near-field records and 15% for far-field records. However, the 5-story configuration showed increased roof displacement, and the 7-story model recorded higher incidences of collapse prevention (CP) hinges, indicating areas for further optimization. Overall, the multi-mushroom system enhances seismic resilience by minimizing plastic hinge formation and improving structural integrity. While the system shows significant promise for low-rise buildings, challenges related to roof displacement and inter-story drift ratio in taller structures necessitate further research. These findings suggest that the multi-mushroom system offers a viable solution for seismic risk reduction, contributing to safer and more sustainable urban development in earthquake-prone areas. | ||
| Key Words | ||
| directed-damage design; multi-mushroom skeleton; nonlinear time history analysis; rocking building; seismic performance level | ||
| Address | ||
| Mahmoud Alhashash: Department of Civil Engineering, Eastern Mediterranean University, Famagusta, North Cyprus via Mersin 10, Türkiye Ahed Habib: Research Institute of Sciences and Engineering, University of Sharjah, Sharjah, UAE Mahmood Hosseini: Department of Civil Engineering, Eastern Mediterranean University, Famagusta, North Cyprus via Mersin 10, Türkiye | ||