A multi-scale approach for crack width prediction in reinforced-concrete beams repaired with composites

Avril, Stéphane; Vautrin, Alain; Hamelin, P.; Surrel, Yves

doi:10.1016/j.compscitech.2004.09.026

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…Nevertheless, at the authors' knowledge, the number of experimental studies combining civil engineering structures and DIC technique is limited. They concern small structures (see [6,7] for instance) or larger ones (see [8][9][10] for instance), although most of them concern models of civil engineering structures or parts of them. Very few experiments have been performed on full scale structures, in laboratory or in situ (see [11]).…”

Section: Introductionmentioning

confidence: 99%

Analysis of Cracks and Deformations in a Full Scale Reinforced Concrete Beam Using a Digital Image Correlation Technique

2010

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This paper deals with the use of a digital image correlation technique for the determination of the actual mechanical behaviour of a full scale reinforced concrete beam after 25 years of service in a severe industrial environment. The objective is to investigate the influence of the service conditions on the cracking process and the flexural behaviour of the beam. For this purpose, one beam is removed from the existing structure before being tested in four point bending in laboratory. Displacement fields derived from digital images captured during five loading cycles are analysed in terms of crack detection and measurement, beam deflection and curvature. Owing to its good resolution, the method proves suitable for early crack detection and measurement. A comparison between experimental results and theoretical values derived from Eurocode 2 design code in the serviceability state suggests the existence of a longitudinal compressive force in the beam. A complementary analysis confirms the validity of this hypothesis. It is concluded that the cracking and the flexural behaviour of the tested beam are significantly affected by the existence of an initial compressive stress, which is possibly resulting from a swelling of the concrete due to long term exposure to wet atmosphere and elevated temperature.

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