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Modélisation de la fissuration des structures en béton soumises à des sollicitations sévères

Abstract : Concrete is a construction materials are prevalent in the world. However, in many industries, it is becoming more common to study the safety margins of a structure with respect to solicitations. It becomes important to predict the failure mode of the structure. Much work has already been made in the world on this subject, leading to operational models in computer codes using finite elements. Nevertheless, difficulties remain, mainly related to concrete cracking. These difficulties lead to open problems concerning the location, initiation and crack propagation. The thesis explores two ways of improving methods of numerical simulation of crack propagation. The first possibility of improvement is the use of the extended finite element method, XFEM. A modeling of mechanical behavior of crack is introduced and leads to a description of crack propagation from one element to another. The second possibility is based on damage mechanics. As part of the modeling of damage generalized standard type, the localization phenomenon has been studied numerically for various behaviors: viscous or damage fragile. These behaviors are described in the same spirit that the laws of the visco-elastic or visco-plasticity or plasticity classics, from a general thermodynamic interpretation. In particular, the laws gradient of damage are also considered in conjunction with recent results from the literature. It is well known that a gradient model for interpreting the effects of scale structures under mechanical loading. It also plays an interesting role in the effects of strain localization.
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Submitted on : Sunday, November 25, 2012 - 12:58:48 PM
Last modification on : Wednesday, November 17, 2021 - 12:28:16 PM
Long-term archiving on: : Tuesday, February 26, 2013 - 3:50:19 AM


  • HAL Id : pastel-00756999, version 1


Truong-Giang Nguyen. Modélisation de la fissuration des structures en béton soumises à des sollicitations sévères. Mécanique des solides [physics.class-ph]. Ecole Polytechnique X, 2012. Français. ⟨pastel-00756999⟩



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