Effect of under-reinforcement on the flexural strength of corroded beams

O'FLAHERTY, Fin, MANGAT, Pal, LAMBERT, Paul and BROWNE, Elena (2008). Effect of under-reinforcement on the flexural strength of corroded beams. Materials and structures, 41 (2), 311-321.

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    Link to published version:: 10.1617/s11527-007-9241-1

    Abstract

    Reinforced concrete beams are normally designed as under-reinforced to provide ductile behaviour i.e. the tensile moment of resistance, Mt(0) is less than the moment of resistance of the compressive zone, Mc. The degree of under-reinforcement (Mt(0)/Mc 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. Mt(0)/Mc is further influenced during service life by corrosion which decreases Mt(0). The paper investigates the influence of Mt(0)/Mc on the residual flexural strength of corroded beams and determines detailing parameters (e.g. size and percentage of steel reinforcement, cover) on Mt(0)/Mc. Corroded reinforced concrete beams (100 mm · 150 mm deep) with varying Mt(0)/Mc 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 Mt(0)/Mc ratios suffer lower flexural strength loss when subjected to tensile reinforcement corrosion. Cover to the main steel does not directly influence Mt(0)/Mc 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
    Uncontrolled Keywords: Under-reinforced ; Corrosion ; Flexural ; Durability ; Structural
    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: Fin O'Flaherty
    Date Deposited: 09 Feb 2011 13:33
    Last Modified: 12 Jan 2015 15:59
    URI: http://shura.shu.ac.uk/id/eprint/3050

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