Tension Stiffening in Lightly Reinforced Concrete Slabs
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VIEW THE REPLYPublication: Journal of Structural Engineering
Volume 133, Issue 6
Abstract
The tensile capacity of concrete is usually neglected when calculating the strength of a reinforced concrete beam or slab, even though concrete continues to carry tensile stress between the cracks due to the transfer of forces from the tensile reinforcement to the concrete through bond. This contribution of the tensile concrete is known as tension stiffening and it affects the member’s stiffness after cracking and hence the deflection of the member and the width of the cracks under service loads. For lightly reinforced members, such as floor slabs, the flexural stiffness of a fully cracked section is many times smaller than that of an uncracked section, and tension stiffening contributes greatly to the postcracking stiffness. In this paper, the approaches to account for tension stiffening in the ACI, European, and British codes are evaluated critically and predictions are compared with experimental observations. Finally, recommendations are included for modeling tension stiffening in the design of reinforced concrete floor slabs for deflection control.
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Acknowledgments
The experimental work reported in this paper was supported by the Australian Research Council.
References
American Concrete Institute (ACI). (2005). “Building code requirements for structural concrete.” ACI 318-05, ACI Committee 318, Detroit.
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British Standards Institution (BS). (1985). “Structural use of concrete, Part 2, code of practice for special circumstances.” BS8100:Part2:1985, British Standard, London, England.
European Committee for Standardization (CEN). (1992). “Eurocode 2: Design of concrete structures Part 1-1: General rules for buildings.” DD ENV 1992-1-1, European Prestandard, Brussels, Belgium.
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Standards Australia (AS). (2001). “Australian standard for concrete structures.” AS 3600-2001, Sydney, Australia.
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© 2007 ASCE.
History
Received: May 22, 2006
Accepted: Dec 28, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Rob Y. H. Chai
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