Abstract
Mixed-mode fracture of concrete is encountered frequently in design of concrete structures. To accurately analyzed and design a concrete structure, it is essential to understand the failure mechanisms of concrete under mixed-mode types of loading. A model, which was originally proposed for mode I failure of concrete, is extended to characterized mixed-mode crack propagation. Crack initiation angles, final failure path, and crack instability of concrete specimens/structures are discussed. A series of mixed-mode notched beam tests were performed to verify the proposed model. The theoretical predictions were found to be in good agreement with the experimental results.
Résumé
Dans la construction en béton, on rencontre fréquemment des ruptures de mode mixte. Pour analyser et concevoir de manière sûr une structure en béton, il est essentiel de comprendre les méchanismes de ruine du béton sous des types de sollicitation de mode mixte. On procède à l'extension d'un modèle proposé à l'origine pour les ruptures de mode I dans le béton, pour caractériser une propagation de fissure selon un mode mixte. On discute les angles d'amorçage de la fissure, le parcours final de la rupture et l'instabilité d'une fissure dans des éprouvettes et dans des structures en béton. On a procédé à une série d'essai de sollicitation selon un mode mixte de poutres entaillées en vue de vérifier le modèle proposé. On trouve que les prédictions théoriques sont en bon accord avec les résultats expérimentaux.
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Jenq, Y.S., Shah, S.P. Mixed-mode fracture of concrete. Int J Fract 38, 123–142 (1988). https://doi.org/10.1007/BF00033002
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DOI: https://doi.org/10.1007/BF00033002