, Volume 41, Issue 2, pp 311-321
Date: 13 Apr 2007

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

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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.