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Application de la mecanique de l'endommagement au comportement non lineaire et a la rupture du beton de structure

Jacky Mazars
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TLDR
In this paper, the authors propose the construction of a MICROSTRUCTURE and a COMPORTATION MECANIQUE DU BETON, who is a member of the International Organization for Standardization (IOS).
Abstract
CETTE ETUDE PROPOSE LA CONSTRUCTION D'UN MODELE DE COMPORTEMENT S'APPUYANT SUR LES PROPRIETES MICROSTRUCTURELLES DU MATERIAU ET PERMETTANT LA SIMULATION NUMERIQUE DE L'ENDOMMAGEMENT. TROIS PARTIES COMPOSENT CE TRAVAIL : 1 - MICROSTRUCTURE ET COMPORTEMENT MECANIQUE DU BETON : IL S'AGIT DE L'ETUDE DE LA FORMATION ET DE L'EVOLUTION DE LA MICROSTRUCTURE DANS LE TEMPS ET SOUS SOLLICITATIONS MECANIQUES. DES MODELES MICROSTRUCTURAUX AIDENT A APPREHENDER LES PRINCIPAUX PHENOMENES DE COMPORTEMENT ET APPORTENT DE NOMBREUX ENSEIGNEMENTS A LA FORMULATION D'HYPOTHESES UTILISEES DANS LA SUITE. - 2 - MODELE DE COMPORTEMENT MECANIQUE DU BETON : ETABLI DANS LE CADRE DE LA THERMODYNAMIQUE DES PROCESSUS IRREVERSIBLES, ON PASSE EN REVUE LES ACQUIS ET ON JUSTIFIE LES APPORTS SPECIFIQUES A CETTE ETUDE. APRES AVOIR TRAITE DES PROBLEMES D'IDENTIFICATION, UNE ETUDE NUMERIQUE A L'ECHELLE DE L'ELEMENT DE VOLUME JUSTIFIE LES CHOIX EFFECTUES ET PERMET DE PROPOSER UNE INTERPRETATION ORIGINALE DE CERTAINS RESULTATS EXPERIMENTAUX. - 3 - ETUDE DE L'ENDOMMAGEMENT EN TRACTION DANS LES STRUCTURES : LA FORMATION DES FISSURES : L'ETUDE PRECEDENTE EST ADAPTEE PUIS INTEGREE A UN PROGRAMME DE CALCUL PAR ELEMENTS FINIS. UNE EXPERIMENTATION VISANT A CARACTERISER PHYSIQUEMENT ET MECANIQUEMENT LA NOTION D'ENDOMMAGEMENT ET DE RUPTURE PERMET DE VERIFIER LE BIEN FONDE DU MODELE PROPOSE ET D'ANALYSER SES PERFORMANCES DANS LE DOMAINE DU CALCUL PREVISIONNEL.

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