Comportement en fatigue des poutres en béton armé renforcées en cisaillement à l'aide de matériaux composites avancés

Abstract

Le mémoire présente les résultats des essais expérimentaux sur des poutres en Té en béton armé renforcées en cisaillement à l'aide de matériaux composites avancés. Les spécimens de tailles réelles ont été testés sous chargement de fatigue durant 5 millions de cycles suivis d'essais statiques jusqu'à la rupture. Les résultats confirment l'efficacité de cette technique à augmenter la résistance en fatigue de telles poutres. La performance du renforcement en cisaillement sous sollicitations de fatigue est attribuable, par l'action du renfort, au soulagement des contraintes au niveau des étriers. Cependant, cette performance est subordonnée à: (i) un bon état du béton des poutres; (ii) la présence d'un système d'ancrage du renfort; (iii) un taux minimal d'armature transversale pour assurer la ductilité de la poutre; et (iv) une limitation de la déformation effective du renfort lors de la vérification à l'état limite de fatigue.

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The thesis presents the results of experimental tests on reinforced concrete T-beams reinforced in shear using advanced composite materials. Full size specimens were tested under fatigue loading for 5 million cycles followed by static testing until failure. The results confirm the effectiveness of this technique in increasing the fatigue resistance of such beams. The performance of the reinforcement in shear under fatigue stresses is attributable, by the action of the reinforcement, to the relief of the stresses at the level of the stirrups. However, this performance is subject to: (i) good condition of the concrete of the beams; (ii) the presence of a reinforcement anchoring system; (iii) a minimum rate of transverse reinforcement to ensure the ductility of the beam; and (iv) a limitation of the effective deformation of the reinforcement during the fatigue limit state verification.