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Theses

Modélisation par éléments discrets du comportement des matériaux cimentaires sous impact sévère : prise en compte du taux de saturation

Abstract : This thesis concerns the modeling of concrete and concrete structures subjected to stresses ranging from quasi-static to dynamic loading, taking into account the presence of free water in pores. The objective is the development of a predictive simulation tool capable of describing the behavior of concrete and concrete structures, taking into account the effects of saturation ratio. The choice of discrete elements for modeling is justified by the discontinuous phenomena that appear in the concrete, such as cracking, fragmentation, spalling and scabbing. Discrete Elements can reproduce reliably and efficiently the local discontinuous behavior and the overall response of the structure.The first part of this work concerns the simulation of quasi-static tests under uniaxial and highly confined triaxial loadings, taking into account the compaction phenomenon. The effects of the free water contained in the pores are taken into account by introducing a dependency between the water saturation level and the inelastic deformation. The identification process of the model parameters is presented. Finally, the model is validated by reproducing the quasi-static behavior of concrete in different tests.The second part of this work concerns the dynamic behavior of concrete. The aim is to extend the validation of the model by simulating impact tests on concrete slabs of different thickness. The dynamic effects are taken into account and impact simulations on concrete slabs of different thickness are made. The results are in good agreement with experimental results.
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  • HAL Id : tel-01587775, version 1

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STAR | CNRS | UGA | 3S-R

Citation

Hicham Benniou. Modélisation par éléments discrets du comportement des matériaux cimentaires sous impact sévère : prise en compte du taux de saturation. Mécanique des matériaux [physics.class-ph]. Université Grenoble Alpes, 2016. Français. ⟨NNT : 2016GREAI055⟩. ⟨tel-01587775⟩

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