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Some considerations on shear and torsion in R/C structural members in fire

Patrick Bamonte (Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy)
Pietro G. Gambarova (Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy)
Nataša Kalaba (Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy)
Sergio Tattoni (Department of Architecture, Built Environment and Construction Engineering, Politecnico di Milano, Milan, Italy)

Journal of Structural Fire Engineering

ISSN: 2040-2317

Article publication date: 13 July 2017

Issue publication date: 17 May 2018

146

Abstract

Purpose

This study aims to provide a factual justification of the extension to fire conditions of the well-known design models for the calculations of R/C members at the ultimate limit state in shear and torsion. Both solid and thin-walled sections are considered. In the latter case, the little-known topic of shear-transfer mechanisms at high temperature is introduced and discussed.

Design/methodology/approach

Both the effective-section method and the zone method are treated, as well as the strut-and-tie models required by the analysis of the so-called D zones (discontinuity zones), where heat-enhanced cracking further bears out the phenomenological basis of the models.

Findings

The increasing role played by the stirrups in shear and by the rather cold concrete core in torsion stand out clearly in fire, while high temperatures rapidly reduce the contributions of such resisting mechanisms as concrete-teeth bending, aggregate interlock and dowel action.

Originality/value

On the whole, beside quantifying the side contributions of web mechanisms and section core in fire conditions, this study indicates a possible approach to extend to fire the available models on the coupling of shear and bending, and shear and torsion in R/C members.

Keywords

Acknowledgements

The authors would like to thank Professor Thomas T.C. Hsu for his suggestions during the workshop on “Shear and Torsion Resistance of R/C Structures” organized on June 17, 2015, at the Politecnico di Milano (Milan, Italy) by Prof Marco Di Prisco. On that occasion, the second author presented an overview on the fire design of R/C in shear and torsion.

Citation

Bamonte, P., Gambarova, P.G., Kalaba, N. and Tattoni, S. (2018), "Some considerations on shear and torsion in R/C structural members in fire", Journal of Structural Fire Engineering, Vol. 9 No. 2, pp. 94-107. https://doi.org/10.1108/JSFE-01-2017-0019

Publisher

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Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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