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A novel approach for the definition and detection of structural irregularity in reinforced concrete buildings

  • S.P. Akshara (Department of Civil Engineering, National Institute of Technology Calicut) ;
  • M. Abdul Akbar (Department of Civil Engineering, National Institute of Technology Calicut) ;
  • T.M. Madhavan Pillai (Department of Civil Engineering, National Institute of Technology Calicut) ;
  • Renil Sabhadiya (KEC International, RPG centre, 30, Forjet street, near Bhatia hospital) ;
  • Rakesh Pasunuti (L&T Construction)
  • Received : 2024.05.04
  • Accepted : 2024.06.18
  • Published : 2024.06.25
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Abstract

To avoid irregularities in buildings, design codes worldwide have introduced detailed guidelines for their check and rectification. However, the criteria used to define and identify each of the plan and vertical irregularities are specific and may vary between codes of different countries, thus making their implementation difficult. This short communication paper proposes a novel approach for quantifying different types of structural irregularities using a common parameter named as unified identification factor, which is exclusively defined for the columns based on their axial loads and tributary areas. The calculation of the identification factor is demonstrated through the analysis of rectangular and circular reinforced concrete models using ETABS v18.0.2, which are further modified to generate plan irregular (torsional irregularity, cut-out in floor slab and non-parallel lateral force system) and vertical irregular (mass irregularity, vertical geometric irregularity and floating columns) models. The identification factor is calculated for all the columns of a building and the range within which the value lies is identified. The results indicate that the range will be very wide for an irregular building when compared to that with a regular configuration, thus implying a strong correlation of the identification factor with the structural irregularity. Further, the identification factor is compared for different columns within a floor and between floors for each building model. The findings suggest that the value will be abnormally high or low for a column in the vicinity of an irregularity. The proposed factor could thus be used in the preliminary structural design phase, so as to eliminate the complications that might arise due to the geometry of the structure when subjected to lateral loads. The unified approach could also be incorporated in future revisions of codes, as a replacement for the numerous criteria currently used for classifying different types of irregularities.

Keywords

Acknowledgement

The stipend provided to the first author by the Ministry of Education, Government of India for pursuing full-time Ph.D. is gratefully acknowledged.

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