Prévision de la rupture des ouvrages en béton sollicités en dynamique rapide

Abstract : This study deals with the aspects of the concrete behaviour under dynamic loading such as impacts and explosions. For this kind of solicitations concrete experiences compaction, a decrease of porosity, plastic strains in compression and also cracking in tension. It is relevant to be able to represent, at the same time, the phenomena of compaction of material, as well as the rupture by phenomenon of extension. The objective of this study is initially to test a constitutive model for concrete, developed within a static framework, for loading where the strain rate becomes significant. In that goal, original experiments of dynamic concrete compaction were developed. These experiments are based on the split Hopkinson test and were carried out on confined concrete samples. These tests made it possible to highlight a significant effect of the strain rate on the spherical behaviour of concrete. Following these experimental observations, a new viscoplastic and visco-damage model was developed. This model is based on Perzyna viscoplasticity associates with a modified Gurson yield function and on a Dubé visco-damage model. This new constitutive model for concrete is able to represent the rate effect experimentally observed. The two models presented in this work were implemented in the finite elements code LS-DYN3D. Simulations of tests carried out on structures allowed to validate the numerical implementation, as well as the "viscous'' model for fast dynamic loading.
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https://tel.archives-ouvertes.fr/tel-00630727
Contributor : Fabrice Gatuingt <>
Submitted on : Tuesday, October 11, 2011 - 10:10:54 AM
Last modification on : Friday, May 17, 2019 - 1:23:44 AM
Long-term archiving on : Tuesday, November 13, 2012 - 4:25:20 PM

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  • HAL Id : tel-00630727, version 1

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Fabrice Gatuingt. Prévision de la rupture des ouvrages en béton sollicités en dynamique rapide. Matériaux. École normale supérieure de Cachan - ENS Cachan, 1999. Français. ⟨tel-00630727⟩

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