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Influence of torsional irregularity on tri-directional floor response spectra used in industrial buildings

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Abstract

The need for industrial buildings has increased multifold, with a wide range in the irregular distribution of floor mass and stiffness. The uneven distribution of floor mass causes mass eccentricity in the floor, inducing torsion in the building. The aim of the present study is to highlight the influence of torsional irregularity due to mass eccentricity on the multi-directional floor response spectra. IS 1893 (Part 4): 2015 suggested time-history analysis of the design basis earthquake to develop floor response spectra, adopting linear analysis technique. Eleven sets of real orthogonal records were chosen to perform time-history analysis to obtain a mean response. The present study observed that the building’s with regular geometry and without stiffness variation in it, a slight mass eccentricity significantly increases floor response spectra. Moreover, actual industrial buildings have significant variations in mass, stiffness, and strength, resulting in further intensifying floor response spectra. Thus, the structural designer needs to use tri-directional floor response spectra for precise and protective non-structural component support design for appropriate response. IS 1893 (Part 1): 2016 suggests reduced stiffness for beam and column for earthquake analysis. Floor response spectra with reduced stiffness were also studied here, and the response was compared with non-linear analysis. Non-structural components lateral design forces as per floor response spectra approach and Indian Standard provisions are also included in the study.

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  1. Department of Applied Mechanics, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur, Maharashtra, 440010, India

    Meenakshi V. Landge & Ramakant K. Ingle

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  1. Meenakshi V. Landge
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Correspondence to Meenakshi V. Landge.

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Landge, M.V., Ingle, R.K. Influence of torsional irregularity on tri-directional floor response spectra used in industrial buildings. Innov. Infrastruct. Solut. 7, 34 (2022). https://doi.org/10.1007/s41062-021-00639-1

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