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Punching Shear Strength of Voided Slabs on the Elastic Bases

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Abstract

This paper presents the results of an experimental investigation on the punching shear strength and failure mechanism of one solid and four voided biaxial slabs under a concentrated load applied at the center of the slab (built on a soil subbase acting as support). In the voided biaxial slab specimens, the first row of spherical void formers was placed at the distances of d, 1.5d, 2d, and 2.5d from the column edge. The punching shear capacity, failure mechanism, and failure angles of the specimens were studied. Then an accurate theoretical equation was formulated for estimating the punching shear capacity of voided slabs. The peak punching shear capacity in the voided slabs, which was only 1.87% lower than that of the solid slab It was found that the punching shear capacity of a voided slab in which spheres are placed at the distance 2d from the column edge are close to the solid slab. Therefore a critical distance and theoretical equation for punching shear of voided slabs were proposed. to evaluate the precision of the proposed theoretical equation, the results were compared with the experimental data. On average, the punching shear capacity estimates ​​of the proposed equation for the voided slabs and the solid slab were respectively 3.31% and 1.62% different from the corresponding experimental values. The results demonstrate the fairly good accuracy of the presented analytical equation.

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Authors and Affiliations

  1. Department of Civil Engineering, Mahabad Branch, Islamic Azad University, Mahabad, Iran

    Hadi Azizian & Alaeddin Behravesh

  2. Civil Engineering Faculty, University of Tabriz, 5166616471, Tabriz, Iran

    Mohammad Ali Lotfollahi-Yaghin

Authors
  1. Hadi Azizian
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  2. Mohammad Ali Lotfollahi-Yaghin
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  3. Alaeddin Behravesh
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Correspondence to Mohammad Ali Lotfollahi-Yaghin.

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Azizian, H., Lotfollahi-Yaghin, M.A. & Behravesh, A. Punching Shear Strength of Voided Slabs on the Elastic Bases. Iran J Sci Technol Trans Civ Eng 45, 2437–2449 (2021). https://doi.org/10.1007/s40996-020-00546-y

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  • DOI: https://doi.org/10.1007/s40996-020-00546-y

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