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Développement d'un outil numérique pour la prévision de la fissuration d’une structure en béton de fibres sous impact.

Abstract : The research work falls within the framework of the transportation and handling safety of radioactive waste containment packages. The goal is to develop a numerical tool capable of simulating the overall behaviour of a fiber concrete structure subject to a dynamic loading. It also gives access to more local information such as cracking, both in terms of path and opening. To do this, a set of mechanical tests is carried out in order to better understand the mechanisms of damage and cracking of the material under quasi-static and dynamic loading. The model capable of capturing on a global scale the non-linearities related to the cracking of the structure in a continuous framework is detailed. The parameters associated with the material constitutive law are identified via an identification procedure based on the experimental data of the conducted tests. The determination of dynamic cracking energy is investigated and the structural inertial part of this is underlined. Two numerical methods used to post-process the results of the global numerical simulations, giving access to finer information at the local scale, in terms of path and crack opening, are detailed. The study of a fiber-reinforced concrete beam subjected to a dynamic 1-point bending loading, post-processed with the two approaches, is presented. The results of the numerical post-processing are compared with those obtained experimentally by correlation of digital images.
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Submitted on : Tuesday, February 13, 2018 - 3:01:05 PM
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Rana Akiki. Développement d'un outil numérique pour la prévision de la fissuration d’une structure en béton de fibres sous impact.. Génie civil. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLN056⟩. ⟨tel-01708295⟩

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