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Theses

Comportement Triaxial du Béton sous fortes contraintes : Influence du trajet de chargement

Abstract : The aim of this thesis is to characterize the behaviour of concrete under high confinement and axial stress of the order of the GigaPascal. It lies within a more general scope of understanding concrete behaviour under impact. The studied concrete have properties close to those used in current construction projects. A triaxial is used to characterize the triaxial behavior of the material according to various loading paths. These tests highlight the irreversible character of the compaction of the concretes, as well as the influence of the loading path on the compaction process. The uniaxial confined and proportional tests show the existence of stress and strain limit states. The comparison of the strain thresholds shows that the limit state curve thus defined is independent of the loading path. Moreover, the first extension tests indicate that the Lode angle has no influence on the limit state curve for the stress levels reached during these tests. The study of the fracture topographies after tests shows an evolution of the inclination of the localization planes with the confining pressure. The cracking is oriented perpendicular to the maximum principal direction of loading when the stress levels increase within the material. The carried out numerical study makes it possible to evaluate the capacity of the PRM-couplé model to reproduce the experimental triaxial compression tests. This model well reproduces the isotropic compaction of the material as well as the surface threshold defined by the experimental limit states. Its major defect is not to take into account the influence of the deviatoric stresses on the behaviour in compaction observed during the experimental tests.
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Theses
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https://tel.archives-ouvertes.fr/tel-00118882
Contributor : Thomas Gabet <>
Submitted on : Wednesday, December 6, 2006 - 6:23:05 PM
Last modification on : Thursday, November 19, 2020 - 3:54:37 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 7:26:02 PM

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  • HAL Id : tel-00118882, version 1

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Citation

Thomas Gabet. Comportement Triaxial du Béton sous fortes contraintes : Influence du trajet de chargement. Sciences de l'ingénieur [physics]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00118882⟩

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