Abstract
This paper shows the ability of the cohesive crack model to predict reasonably well the behaviour of concrete specimens. To demonstrate this two very different examples are considered. The first is an engineering problem related to the breakage of precase concrete piles; it is shown that the cohesive crack model points to the relevant parameters and suggests ways to improve the behaviour of the concrete. The second example analyses the well known effect of size on the modulus of rupture when measured during the three point bending of beams. The predictions using a simple cohesive model with bilinear softening are very good. The present work shows how this model not only predicts accurately the maximum loads for different geometries and sizes but also is able to make reasonably good predictions of load and displacement at any instant throughout the test.
Resume
On montre ici l'aptitude du modèle de fissure cohésive à prédire de façon significative le comportement d'éprouvettes de béton. Dans ce but, on considère deux exemples assez différents.
Dans le premier cas, il s'agit d'un problème de génie civil relatif à la rupture de pieux en béton préfabriqué. Ces pieux, fabriqués avec deux bétons présentant les mêmes propriétés mécaniques standard (résistance à la traction et à la compression, module d'élasticité), se sont comportés de façon différente, l'une des séries étant plus fragile que l'autre. Les concepts du modèle de fissuration cohésive ont donné des clés pour comprendre ce problème en identifiant le paramètre dominant, la longueur caractéristique, et en suggérant des méthodes pour améliorer sa valeur.
Le second cas concerne l'effet d'échelle, bien connu, sur la résistance à la flexion mesurée sur des éprouvettes en flexion à trois points. Les résultats expérimentaux montrent une bonne concordance avec les prédictions basées sur un modèle de fissure cohésive simple avec amollissement bi-linéaire. Les quatre paramètres de la courbe ont été déterminés par la méthode GBF (General Bilinear Fitting) proposée par l'auteur et son équipe.
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This paper is the final version of the lecture delivered by the author when he was awarded the Robert L'Hermite Medal during the 48th meeting of RILEM General Council in Trento on 30 September 1994.
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Guinea, G.V. Modelling the fracture of concrete: the cohesive crack. Materials and Structures 28, 187–194 (1995). https://doi.org/10.1007/BF02473248
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DOI: https://doi.org/10.1007/BF02473248