Effect of under reinforcement on the flexural strength of corroded beams

O'FLAHERTY, F. J., MANGAT, P. S., LAMBERT, P. and BROWNE, E. H. (2007). Effect of under reinforcement on the flexural strength of corroded beams. Materials and structures, 58 (1), 31-42.

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Abstract

Reinforced concrete beams are normally designed as under-reinforced to provide ductile behaviour i.e. the tensile moment of resistance, M t(0) is less than the moment of resistance of the compressive zone, M c . The degree of under-reinforcement (M t(0)/M c ratio) can depend upon the preferences of the designer in complying with design and construction constraints, codes and availability of steel reinforcement diameters and length. M t(0)/M c is further influenced during service life by corrosion which decreases M t(0). The paper investigates the influence of M t(0)/M c on the residual flexural strength of corroded beams and determines detailing parameters (e.g. size and percentage of steel reinforcement, cover) on M t(0)/M c . Corroded reinforced concrete beams (100 mm × 150 mm deep) with varying M t(0)/M c ratios were tested in flexure. The results of the investigation were combined with the results of similar work by other researchers and show that beams with lower M t(0)/M c ratios suffer lower flexural strength loss when subjected to tensile reinforcement corrosion. Cover to the main steel does not directly influence M t(0)/M c and, thus, the residual flexural strength of corroded beams is not normally affected by increased cover. A simplified expression for estimating the residual strength of corroded beams is also given.

Item Type:	Article
Additional Information:	© Springer
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Infrastructure Management
Identification Number:	10.1617/s11527-007-9241-1
Depositing User:	Ann Betterton
Date Deposited:	08 Feb 2008
Last Modified:	07 Oct 2010 09:50
URI:	http://shura.shu.ac.uk/id/eprint/663

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