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Non-axis-symmetrical punching shear around internal columns of RC slabs without transverse reinforcement

Sagaseta, J, Muttoni, A, Ruiz, MF and Tassinari, L (2011) Non-axis-symmetrical punching shear around internal columns of RC slabs without transverse reinforcement Magazine of Concrete Research, 63 (6). 441 - 457. ISSN 0024-9831

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Abstract

Non-axis-symmetrical punching shear around internal columns of RC slabs without transverse reinforcement Abstract: Most analytical approaches and available test data for punching shear in flat slabs assume axis-symmetrical conditions, which seems realistic for representing slabs supported on columns equally spaced in both orthogonal directions. However, in practice, there are many instances where loading, geometry and reinforcement around internal columns differ significantly from ideal axis-symmetrical conditions. Typical examples include slab bridges, flat slabs with unequal spans and footings with unequal widths. This paper presents a series of punching shear tests on slabs without transverse reinforcement and different flexural reinforcement ratios or loading conditions in each orthogonal direction. The tests show that both the type of loading and the amount of flexural reinforcement have a significant influence on the punching shear strength and symmetry of the response. Eurocode 2 and BS 8110 code formulas provided reasonable strength predictions of the tests using the recommended average reinforcement ratio between the x and y directions. A physical explanation behind this assumption is presented, based on critical shear crack theory. A rational analytical approach was developed for non-axis-symmetrical punching, which provides accurate predictions of strength and deformation capacity. The novelty of the proposed method is that it considers a non-uniform shear strength distribution per unit length along the control perimeter, which results in a redistribution of shear near failure.

Item Type: Article
Additional Information: Copyright 2011 Thomas Telford. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees. The definitive version is available at http://www.cement-research.com
Divisions: Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Depositing User: Symplectic Elements
Date Deposited: 23 Oct 2012 16:19
Last Modified: 23 Sep 2013 19:36
URI: http://epubs.surrey.ac.uk/id/eprint/713659

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