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Approche multi-échelle du comportement mécanique des structures en béton armé - Application aux enceintes de confinement des centrales nucléaires

Abstract : This thesis develops a multi-scale strategy to describe the mechanical behaviour of steel reinforcements and prestressing tendons in a reinforced concrete structure. This strategy is declined in several steps, which allow gradual integration of new physical phenomena. The first asymptotic model represents the effective elastic behaviour of heterogeneities periodically distributed on a surface. It combines an elastic interface behaviour and a membrane behaviour. A second asymptotic model then focuses on the behaviour of rigid fibers distributed on a surface, which may slide with respect to the surrounding volume. These models induce less stress concentrations than the usual truss models. They are implemented in the finite element code Code_Aster, and validated with respect to reference three-dimensional simulations. Their interaction with a macroscopic crack is studied. Finally, this strategy allows the modeling of experimental tests carried out on a portion of a containment building in real scale.
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https://pastel.archives-ouvertes.fr/pastel-00765705
Contributor : Martin David <>
Submitted on : Tuesday, December 18, 2012 - 7:26:42 PM
Last modification on : Thursday, September 24, 2020 - 4:00:22 PM
Long-term archiving on: : Tuesday, March 19, 2013 - 2:55:10 AM

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  • HAL Id : pastel-00765705, version 1

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Martin David. Approche multi-échelle du comportement mécanique des structures en béton armé - Application aux enceintes de confinement des centrales nucléaires. Mécanique des structures [physics.class-ph]. Ecole Polytechnique X, 2012. Français. ⟨pastel-00765705⟩

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