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Theses

Étude du comportement des ancrages chevillés dans les ouvrages de génie civil des installations nucléaires françaises

Abstract : Fastening systems are used to secure many external structures and Elements Important for Protection in French nuclear installations. They are designed to transmit the load from the fixed elements to the supporting structure. Nevertheless, the evaluation of the performance of existing fasteners is a major concern because of the safety issues that can arise if they were inappropriately chosen, especially in the case of an earthquake.Generally, the study of the behavior of anchors in concrete is conducted through experimental campaigns. However, they are costly, time-consuming, and limited by the number of tests performed. Moreover, they are not suitable to re-qualify anchors already installed and in production phase-out. Therefore, numerical simulation has recently become more useful in the field of fasteners to understand non-linear mechanisms. In this context, the proposed scientific approach is based on two complementary modeling approaches to evaluate the behavior of fasteners under seismic loading. The first modeling is done at the fastener scale where a beam-particle model, called DEAP, is used. This type of model allows a fine and detailed description of the behavior of the interface between the anchor and the concrete as well as the cracking of the concrete. At the scale of the structure, a simplified model using generalized variables is formulated and calibrated from the experimental results and the results obtained by DEAP. This type of macroscopic model simplifies the representation of the non-linear behavior of the fasteners and reduces the computational cost of the simulations. Thus, this model enables to perform a large number of calculations for vulnerability analyses of civil engineering structures under seismic loading.During this thesis, several contributions have been made, notably in the form of numerical developments. First, a new procedure for generating a discrete element mesh and taking into account complex geometries, such as fastening systems, is proposed and developed. Second, a new simplified strategy for contact detection in 2D as well as in 3D is implemented to improve the computing time. All these developments added to DEAP allowed two-dimensional and three-dimensional simulations of a pull-out test at the local scale. The results validated the ability of a discrete beam-particle model to reproduce the concrete cracking patterns caused by a pull-out test and to determine the maximum force of the anchor before failure. Then, based on the experimental results and the discrete element simulations, a simplified model using generalized variables was formulated and identified. Many non-linear mechanisms were considered in this model in order to represent the complete behavior of an anchor present in civil engineering structures. This proposed macroscopic model is flexible and simple enough to be adapted to different types of anchors. The work and contributions made during these three years of thesis constitute an important step for further studies on different types of anchors under various types of loads.
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Submitted on : Wednesday, January 5, 2022 - 9:34:15 AM
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Aya Rima. Étude du comportement des ancrages chevillés dans les ouvrages de génie civil des installations nucléaires françaises. Génie civil. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPAST117⟩. ⟨tel-03511693⟩

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