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Modélisations thermomécanique et numérique du comportement de maçonneries en briques alvéolées en terre cuite sous chargements mécanique et thermique sévères

Abstract : One of the major challenges of the hollow clay brick industry nowadays is to improve the fire resistance of ambitiously tall buildings, constructed with this type of bricks. The objective of our work is to develop thermo-mechanical models and related predictive numerical tools to guide the research of improved fire-performance products and therefore reduce the number of expensive experimental tests. Our main contributions are methodological. With a permanent concern of reducing the simulation costs, we establish a dialogue between observations, measurements and experimental results, on the one hand, models and simulations on the other hand. In this regard, measurements, obtained during the experimental tests we carried out, are used to progressively develop relevant models, by examining the importance of thermal phenomena (conduction, convection and radiation), by looking for the just right transfer relations (with respect to our objectives) at the multiple interfaces of the problem and by considering the phase change of bound water. After identifying the good thermo-mechanical mechanisms, we calibrate some numerical parameters by solving an inverse problem. Moreover, to efficiently help the design of new products, we employ the multi-model and multi-scale Arlequin framework to formulate, approximate and solve resulting thermo-mechanical problems. The latters include areas of thermal gradient concentrations and mechanical singularities. Our global approach implemented and tested by developing codes and enriching others, shows a real ability of our methodology to efficiently compute structures made of hollow bricks, when subjected to thermomechanical load.
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Submitted on : Friday, June 8, 2018 - 2:54:07 PM
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Ahmed Sridi. Modélisations thermomécanique et numérique du comportement de maçonneries en briques alvéolées en terre cuite sous chargements mécanique et thermique sévères. Autre. Université Paris-Saclay, 2018. Français. ⟨NNT : 2018SACLC047⟩. ⟨tel-01811059⟩

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