Application of Evolutionary Techniques to Minimize Torsion for Plan Irregular Re-entrant Corner Buildings

Year 2025, Volume: 9 Issue: 2, 272 - 280

Abdul Hafeez Mohammed , M. Anjaneya Prasad , Dakshina Murthy N.r.

https://doi.org/10.31127/tuje.1552068

Abstract

Irregular structures are accounting significant presence due to varied occupational and aesthetic demands, specifically in urban infrastructure. Majority of such buildings are irregular to some extent due to the presence of asymmetry in plan, elevation, irregular vertical member distribution or floor mass distribution or combinations of these reasons. Perfectly regular buildings are an idealized concept, and in actuality, this requirement is rarely met. The effect of seismic action is due the presence of structural irregularity in buildings causes substantial displacement amplifications and stress concentrations in the members, resulting in severe damage and ultimately early collapse. According to IS-1893:2016, a building is torsionally irregular if the maximum horizontal displacement at any floor in the direction of lateral force exceeds 1.5 times the minimum horizontal displacement at the far end. Torsional irregularity, also known as in-plan irregularity, occurs when the lines of action of centers of mass and stiffness on a common vertical axis at each floor level do not coincide. During earthquakes or other lateral loads, inertia forces act through the center of mass, while resistive forces act through the center of stiffness or resistance. The relative location of a building's center of mass, strength, and stiffness influences the torsional forces operating on it. These centers of significance must be strategically placed to minimize torsional impacts on structures and provide an efficient building structure. In this paper, the impacts of Static eccentricity with regard to the building's center of mass are examined, and a non-linear dynamic analysis is performed to investigate the variation in torsional irregularity ratio and other torsional parameters. Genetic Algorithm has been adopted to minimize Static eccentricity and arrange lateral force resisting elements to achieve the lowest torsional irregularity ratio. The developed model was found to be quite productive and the torsional irregularity ratio has reduced successfully.

Keywords

Asymmetric structure, Stiffness eccentricity, Non-linear Time History analysis, Genetic Algorithm, Torsional irregularity ratio

Supporting Institution

I would like to thank Maulana Azad Nation Urdu University for allowing me to pursue Ph.D.

Project Number

01

Thanks

I would like to thank Dr. M. Anjaneya Prasad sir for reviewing and editing the research article.

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