Documents disponibles écrits par cet auteur

Chemo - mechanical modeling requirements for the assessment of concrete structure service life / L. Buffo-Lacarrière in Journal of engineering mechanics, Vol. 137 N° 9 (Septembre 2011) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 137 N° 9 (Septembre 2011) . - pp.625-633 Titre : Chemo - mechanical modeling requirements for the assessment of concrete structure service life Type de document : texte imprimé Auteurs : L. Buffo-Lacarrière, Auteur ; A. Sellier, Auteur Année de publication : 2011 Article en page(s) : pp.625-633 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Leaching  Hydration  Constitutive  relations  Creep  Damage  Chemo-mechanical  coupling  Concrete  structures Résumé : This paper deals with the formulation requirements for the finite-element modeling of the life cycle of concrete structures subjected to chemical evolution combined with mechanical loading. In particular, it considers the coupling of chemical evolution with nonlinear mechanical behavior combining creep and damage. Not only do the parameters of the mechanical model have to be adapted to the effect of chemical evolution, but also the chemical effects on the internal mechanical state variables of the chemical evolution have to be carefully considered. These two couplings are discussed and clarified in a general formulation useful for a finite-element implementation of a mechanical behavior law intended for chemo-mechanical applications. The approach is illustrated through a model developed to assess the mechanical behavior of concrete structures subjected to hydration and then to leaching during their service life. Hydration and leaching need to be considered together in the same model to study how damage of the concrete at its early age can affect its response in the long term. The model is implemented in a finite-element code and applied, first to the simulation of an early age creep test and then to the prediction of the very-long-term mechanical behavior of a nuclear waste storage facility. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i9/p625_s1?isAuthorized=no [article] Chemo - mechanical modeling requirements for the assessment of concrete structure service life [texte imprimé] / L. Buffo-Lacarrière, Auteur ; A. Sellier, Auteur . - 2011 . - pp.625-633. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 9 (Septembre 2011) . - pp.625-633 Mots-clés : Leaching  Hydration  Constitutive  relations  Creep  Damage  Chemo-mechanical  coupling  Concrete  structures Résumé : This paper deals with the formulation requirements for the finite-element modeling of the life cycle of concrete structures subjected to chemical evolution combined with mechanical loading. In particular, it considers the coupling of chemical evolution with nonlinear mechanical behavior combining creep and damage. Not only do the parameters of the mechanical model have to be adapted to the effect of chemical evolution, but also the chemical effects on the internal mechanical state variables of the chemical evolution have to be carefully considered. These two couplings are discussed and clarified in a general formulation useful for a finite-element implementation of a mechanical behavior law intended for chemo-mechanical applications. The approach is illustrated through a model developed to assess the mechanical behavior of concrete structures subjected to hydration and then to leaching during their service life. Hydration and leaching need to be considered together in the same model to study how damage of the concrete at its early age can affect its response in the long term. The model is implemented in a finite-element code and applied, first to the simulation of an early age creep test and then to the prediction of the very-long-term mechanical behavior of a nuclear waste storage facility. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i9/p625_s1?isAuthorized=no

Probabilistic approach for durability design of reinforced concrete in marine environment / F. Deby in Cement and concrete research, Vol. 39 N° 5 (Mai 2009) 

Public ISBD [article]  in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 466–471 Titre : Probabilistic approach for durability design of reinforced concrete in marine environment Type de document : texte imprimé Auteurs : F. Deby, Auteur ; M. Carcassès, Auteur ; A. Sellier, Auteur Année de publication : 2009 Article en page(s) : pp. 466–471 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete;  Corrosion;  Chloride  diffusion;  Probabilistic  approach;Reliability  index Résumé : A probabilistic approach to durability is proposed for the design of reinforced cover of a concrete immersed in sea water. It uses a non-linear chloride diffusion model for a saturated medium, which is first exposed with its physical parameters. Parameter variability is estimated and used through the probabilistic approach to assess the probability of reaching a critical chloride concentration near the reinforcement for a given service life. Based on the concrete formulation and the cement chemical composition, the model parameters are evaluated with their associated random distribution. The corrosion risk is then estimated through the Hasofer–Lind reliability index. Currently, the methodology is available for Ordinary Portland Cement (OPC) and for saturated media. A practical application is proposed to underline the applicability of the methodology. The decrease in the reliability index with time is computed for a cover depth coming from actual design rules. The probabilistic sensitivity factors are also assessed and show the importance of some model parameters called “durability indicators”. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000507 [article] Probabilistic approach for durability design of reinforced concrete in marine environment [texte imprimé] / F. Deby, Auteur ; M. Carcassès, Auteur ; A. Sellier, Auteur . - 2009 . - pp. 466–471. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 39 N° 5 (Mai 2009) . - pp. 466–471 Mots-clés : Concrete;  Corrosion;  Chloride  diffusion;  Probabilistic  approach;Reliability  index Résumé : A probabilistic approach to durability is proposed for the design of reinforced cover of a concrete immersed in sea water. It uses a non-linear chloride diffusion model for a saturated medium, which is first exposed with its physical parameters. Parameter variability is estimated and used through the probabilistic approach to assess the probability of reaching a critical chloride concentration near the reinforcement for a given service life. Based on the concrete formulation and the cement chemical composition, the model parameters are evaluated with their associated random distribution. The corrosion risk is then estimated through the Hasofer–Lind reliability index. Currently, the methodology is available for Ordinary Portland Cement (OPC) and for saturated media. A practical application is proposed to underline the applicability of the methodology. The decrease in the reliability index with time is computed for a cover depth coming from actual design rules. The probabilistic sensitivity factors are also assessed and show the importance of some model parameters called “durability indicators”. ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science/article/pii/S0008884609000507