Dépouillements

Predicting concrete behaviour from quasi-static loading to hypervelocity impact / Christophe Pontiroli in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 703-727 Titre : Predicting concrete behaviour from quasi-static loading to hypervelocity impact : An overview of the PRM model Type de document : texte imprimé Auteurs : Christophe Pontiroli, Auteur ; Alain Rouquand, Auteur ; Jacky Mazars, Auteur Année de publication : 2011 Article en page(s) : pp. 703-727 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete model Damage modelling Plasticity Structural dynamics Impact loadings Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the main results obtained during a long and intensive research period on the modelling of the main physical mechanisms related to damage and fracture of concrete. The starting point has been the Mazars one scalar damage model (Mazars, 1984, 1986). On this base Pontiroli & Rouquand have proposed in 1995 a two scalar damage model (PRM model) which takes into account the crack closure mechanism, irreversible strains, strain rate effects and internal friction stresses. This model has been recently completed in order to take into account pore collapse phenomena, plastic shear deformations and the water content effect on the behaviour of concrete for confined loading. All these mechanisms allow the simulation of a large range of loadings from static to high velocity impacts. After a presentation of the most important features of the "PRM coupled model" several applications are given related to quasi static loading, blast or impact effects on concrete structures. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Predicting concrete behaviour from quasi-static loading to hypervelocity impact : An overview of the PRM model [texte imprimé] / Christophe Pontiroli, Auteur ; Alain Rouquand, Auteur ; Jacky Mazars, Auteur . - 2011 . - pp. 703-727. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 703-727 Mots-clés : Concrete model Damage modelling Plasticity Structural dynamics Impact loadings Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents the main results obtained during a long and intensive research period on the modelling of the main physical mechanisms related to damage and fracture of concrete. The starting point has been the Mazars one scalar damage model (Mazars, 1984, 1986). On this base Pontiroli & Rouquand have proposed in 1995 a two scalar damage model (PRM model) which takes into account the crack closure mechanism, irreversible strains, strain rate effects and internal friction stresses. This model has been recently completed in order to take into account pore collapse phenomena, plastic shear deformations and the water content effect on the behaviour of concrete for confined loading. All these mechanisms allow the simulation of a large range of loadings from static to high velocity impacts. After a presentation of the most important features of the "PRM coupled model" several applications are given related to quasi static loading, blast or impact effects on concrete structures. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Non local damage model / Pijaudier-Cabot, Gilles in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 729-749 Titre : Non local damage model : Boundary and evolving boundary effects Type de document : texte imprimé Auteurs : Pijaudier-Cabot, Gilles, Auteur ; Dufour, Frédéric, Auteur Année de publication : 2011 Article en page(s) : pp. 729-749 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Damage Non locality Boundary effects Interactions Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The present contribution aims at providing a closer insight on boundary effects in non local damage modelling. From micromechanics, we show that on a boundary interaction stress components normal to the surface should vanish. These interaction stresses are at the origin of non locality and therefore the material response of points located on the boundary should be partially local. Then, we discuss a tentative modification of the classical non local damage model aimed at accounting for this effect due to existing boundaries and also boundaries that arise from crack propagation. One-dimensional computations show that the profiles of damage are quite different compared to those obtained with the original formulation. The region in which damage is equal to 1 is small. The modified model performs better at complete failure, with a consistent description of discontinuity of the displacement field after failure. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Non local damage model : Boundary and evolving boundary effects [texte imprimé] / Pijaudier-Cabot, Gilles, Auteur ; Dufour, Frédéric, Auteur . - 2011 . - pp. 729-749. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 729-749 Mots-clés : Damage Non locality Boundary effects Interactions Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The present contribution aims at providing a closer insight on boundary effects in non local damage modelling. From micromechanics, we show that on a boundary interaction stress components normal to the surface should vanish. These interaction stresses are at the origin of non locality and therefore the material response of points located on the boundary should be partially local. Then, we discuss a tentative modification of the classical non local damage model aimed at accounting for this effect due to existing boundaries and also boundaries that arise from crack propagation. One-dimensional computations show that the profiles of damage are quite different compared to those obtained with the original formulation. The region in which damage is equal to 1 is small. The modified model performs better at complete failure, with a consistent description of discontinuity of the displacement field after failure. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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A mesoscopic model for a better understanding of the transition from diffuse damage to localized damage / The Dung Nguyen in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 751-776 Titre : A mesoscopic model for a better understanding of the transition from diffuse damage to localized damage Type de document : texte imprimé Auteurs : The Dung Nguyen, Auteur ; Claire Lawrence, Auteur ; Christian La Borderie, Auteur Année de publication : 2011 Article en page(s) : pp. 751-776 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete Mesoscopic approach Diffuse damage Localized Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The aim of this paper is to present a modelling of mechanical behaviour of concrete on a mesoscopic scale. Concrete is considered as a bi-phasic material where the cement paste and the aggregates are described with their own mechanical characteristics. Firstly, the model is studied in two dimensions in order to optimize the geometrical model of the inner structure of concrete in terms of the meshing strategy and the smallest size of the aggregate to be taken into account. The model shows interesting results on the transition from diffuse to localized damage and is able to reproduce dilatancy in compression. Finally, results of the three-dimensional model are shown in tension. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] A mesoscopic model for a better understanding of the transition from diffuse damage to localized damage [texte imprimé] / The Dung Nguyen, Auteur ; Claire Lawrence, Auteur ; Christian La Borderie, Auteur . - 2011 . - pp. 751-776. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 751-776 Mots-clés : Concrete Mesoscopic approach Diffuse damage Localized Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The aim of this paper is to present a modelling of mechanical behaviour of concrete on a mesoscopic scale. Concrete is considered as a bi-phasic material where the cement paste and the aggregates are described with their own mechanical characteristics. Firstly, the model is studied in two dimensions in order to optimize the geometrical model of the inner structure of concrete in terms of the meshing strategy and the smallest size of the aggregate to be taken into account. The model shows interesting results on the transition from diffuse to localized damage and is able to reproduce dilatancy in compression. Finally, results of the three-dimensional model are shown in tension. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Strength and damage of concrete under high triaxial loading / Yann Malécot in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 777-803 Titre : Strength and damage of concrete under high triaxial loading Type de document : texte imprimé Auteurs : Yann Malécot, Auteur ; Daudeville, Laurent, Auteur ; Fabrice Dupray, Auteur Année de publication : 2011 Article en page(s) : pp. 777-803 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete Triaxial test High confinement Mesoscale modeling Young's modulus Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This study focuses on identifying concrete behavior under severe loading (near field detonation or ballistic impacts). In order to reproduce high stress levels with wellcontrolled loading paths, static tests are carried out on concrete samples by mean of a very high-capacity triaxial press. Experimental results indicate a sizeable change in concrete behavior with confining pressure. At low pressure values, the concrete exhibits brittle behavior with failure caused by a localized damage mechanism. In contrast, at high confining pressures, the concrete becomes a ductile material, and failure is associated with diffuse material damage. These tests also show an evolution of the elastic characteristics of concrete. A numerical modeling of these previous experiments is performed at a mesoscopic scale. It provides a reproduction of the main characteristics of concrete behavior under high confinement, both qualitatively and quantitatively. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Strength and damage of concrete under high triaxial loading [texte imprimé] / Yann Malécot, Auteur ; Daudeville, Laurent, Auteur ; Fabrice Dupray, Auteur . - 2011 . - pp. 777-803. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 777-803 Mots-clés : Concrete Triaxial test High confinement Mesoscale modeling Young's modulus Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This study focuses on identifying concrete behavior under severe loading (near field detonation or ballistic impacts). In order to reproduce high stress levels with wellcontrolled loading paths, static tests are carried out on concrete samples by mean of a very high-capacity triaxial press. Experimental results indicate a sizeable change in concrete behavior with confining pressure. At low pressure values, the concrete exhibits brittle behavior with failure caused by a localized damage mechanism. In contrast, at high confining pressures, the concrete becomes a ductile material, and failure is associated with diffuse material damage. These tests also show an evolution of the elastic characteristics of concrete. A numerical modeling of these previous experiments is performed at a mesoscopic scale. It provides a reproduction of the main characteristics of concrete behavior under high confinement, both qualitatively and quantitatively. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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A review of continuum damage modelling for dam analysis / Eric Bourdarot in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 805-822 Titre : A review of continuum damage modelling for dam analysis : Main steps of a fruitful university-industry collaboration leading to an integrated model applicable to AAR affected structures Type de document : texte imprimé Auteurs : Eric Bourdarot, Auteur ; Alain Sellier, Auteur ; Stéphane Multon, Auteur Année de publication : 2011 Article en page(s) : pp. 805-822 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dam Concrete Damage Swelling Modelling Alkali-aggregate reactions Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This article presents the different steps of a research process initiated in the field of dam engineering, through collaboration between EDF and ENS Cachan, following Jacky Mazars' pioneering work on the application of the damage concept to concrete structure modelling. Considering the importance of concrete swelling phenomena for the long-term behaviour of concrete dams, special efforts have been devoted to the development of a rheologic model in this field. This paper explains how the research performed contributed to the elaboration and the justification of the main equations included. An application to the Temple-sur-Lot dam is presented. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] A review of continuum damage modelling for dam analysis : Main steps of a fruitful university-industry collaboration leading to an integrated model applicable to AAR affected structures [texte imprimé] / Eric Bourdarot, Auteur ; Alain Sellier, Auteur ; Stéphane Multon, Auteur . - 2011 . - pp. 805-822. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 805-822 Mots-clés : Dam Concrete Damage Swelling Modelling Alkali-aggregate reactions Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This article presents the different steps of a research process initiated in the field of dam engineering, through collaboration between EDF and ENS Cachan, following Jacky Mazars' pioneering work on the application of the damage concept to concrete structure modelling. Considering the importance of concrete swelling phenomena for the long-term behaviour of concrete dams, special efforts have been devoted to the development of a rheologic model in this field. This paper explains how the research performed contributed to the elaboration and the justification of the main equations included. An application to the Temple-sur-Lot dam is presented. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Simplified modelling strategies for reinforced concrete structures / Panagiotis Kotronis in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 823-838 Titre : Simplified modelling strategies for reinforced concrete structures Type de document : texte imprimé Auteurs : Panagiotis Kotronis, Auteur ; Stéphane Grange, Auteur Année de publication : 2011 Article en page(s) : pp. 823-838 Note générale : Génie Civil Langues : Français (fre) Mots-clés : SSI Timoshenko beam Multifiber Shear Torsion Macro-element Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Three simplified modelling strategies are proposed to simulate the non linear behaviour of reinforced concrete (RC) structures submitted to severe loadings. The Equivalent Reinforced Concrete model (ERC) is suitable for very squat RC walls and it is based on the Framework method coupled with damage mechanics and plasticity constitutive laws. The multifiber Timoshenko beam can be used for slender or squat structures submitted to severe shear or torsion. Finally, the SSI macro-element coupled with the multifiber beam is able to reproduce soil structure interaction phenomena on the foundation and the structure. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Simplified modelling strategies for reinforced concrete structures [texte imprimé] / Panagiotis Kotronis, Auteur ; Stéphane Grange, Auteur . - 2011 . - pp. 823-838. Génie Civil Langues : Français (fre) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 823-838 Mots-clés : SSI Timoshenko beam Multifiber Shear Torsion Macro-element Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Three simplified modelling strategies are proposed to simulate the non linear behaviour of reinforced concrete (RC) structures submitted to severe loadings. The Equivalent Reinforced Concrete model (ERC) is suitable for very squat RC walls and it is based on the Framework method coupled with damage mechanics and plasticity constitutive laws. The multifiber Timoshenko beam can be used for slender or squat structures submitted to severe shear or torsion. Finally, the SSI macro-element coupled with the multifiber beam is able to reproduce soil structure interaction phenomena on the foundation and the structure. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Damage mechanics applied to the seismic behavior of concrete structures / Shahrokh Ghavamian in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 839-854 Titre : Damage mechanics applied to the seismic behavior of concrete structures Type de document : texte imprimé Auteurs : Shahrokh Ghavamian, Auteur ; Ludovic Jason, Auteur ; Justine Bonenfant, Auteur Année de publication : 2011 Article en page(s) : pp. 839-854 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Seismic evaluation Reinforced concrete Structures Nonlinear behavior Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The seismic behavior of reinforced concrete structures is generally evaluated through modal spectral approaches, based on linear elastic analysis. In the case of seismic reevaluation of existing structures using traditional methods, since the nonlinear behavior of materials is not taken into account, these techniques often lead to an overestimation of the needs in reinforcement. In this contribution, it is proposed to highlight how including nonlinearity in the mechanical behavior of concrete and steel can improve the seismic evaluation of RC structures. For this purpose, a pushover technique is applied on an office building. Contrary to a classical approach, the progression of the failure mode and the mechanical degradation can be obtained and used to accurately elaborate the best retrofitting strategy. Some improvements of the constitutive laws are nevertheless needed if the use of this type of approaches is to be extended to more complex structures. However, the maturity of most constitutive models is not enough to allow industrial applications. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Damage mechanics applied to the seismic behavior of concrete structures [texte imprimé] / Shahrokh Ghavamian, Auteur ; Ludovic Jason, Auteur ; Justine Bonenfant, Auteur . - 2011 . - pp. 839-854. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 839-854 Mots-clés : Seismic evaluation Reinforced concrete Structures Nonlinear behavior Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The seismic behavior of reinforced concrete structures is generally evaluated through modal spectral approaches, based on linear elastic analysis. In the case of seismic reevaluation of existing structures using traditional methods, since the nonlinear behavior of materials is not taken into account, these techniques often lead to an overestimation of the needs in reinforcement. In this contribution, it is proposed to highlight how including nonlinearity in the mechanical behavior of concrete and steel can improve the seismic evaluation of RC structures. For this purpose, a pushover technique is applied on an office building. Contrary to a classical approach, the progression of the failure mode and the mechanical degradation can be obtained and used to accurately elaborate the best retrofitting strategy. Some improvements of the constitutive laws are nevertheless needed if the use of this type of approaches is to be extended to more complex structures. However, the maturity of most constitutive models is not enough to allow industrial applications. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Inelastic seismic analysis of the SPEAR test building / Jean-Marie Reynouard in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 855-867 Titre : Inelastic seismic analysis of the SPEAR test building Type de document : texte imprimé Auteurs : Jean-Marie Reynouard, Auteur ; Nicolas Ile, Auteur ; Michael Brun, Auteur Année de publication : 2011 Article en page(s) : pp. 855-867 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Seismic bi-directional excitation Irregular structure Reinforced concrete 3D model Bond-slip effect Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In this paper, it is presented the study of the inelastic seismic response of the 3storey irregular SPEAR building, which was pseudodynamically tested under bi-directional seismic excitations at the ELSA Laboratory of the Joint Research Centre. In the proposed method, a 3D modeling is employed to capture the seismic response of the structure. Comparison of analytical and experimental results indicates that the effect of fixed end rotation due to bond-slip plays an important role and has to be adequately taken into account. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Inelastic seismic analysis of the SPEAR test building [texte imprimé] / Jean-Marie Reynouard, Auteur ; Nicolas Ile, Auteur ; Michael Brun, Auteur . - 2011 . - pp. 855-867. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 855-867 Mots-clés : Seismic bi-directional excitation Irregular structure Reinforced concrete 3D model Bond-slip effect Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : In this paper, it is presented the study of the inelastic seismic response of the 3storey irregular SPEAR building, which was pseudodynamically tested under bi-directional seismic excitations at the ELSA Laboratory of the Joint Research Centre. In the proposed method, a 3D modeling is employed to capture the seismic response of the structure. Comparison of analytical and experimental results indicates that the effect of fixed end rotation due to bond-slip plays an important role and has to be adequately taken into account. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Damage mechanics applied to the modelling of corroded reinforced concrete structures / Frédéric Ragueneau in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 869-890 Titre : Damage mechanics applied to the modelling of corroded reinforced concrete structures : Steel, concrete and interface Type de document : texte imprimé Auteurs : Frédéric Ragueneau, Auteur ; Benjamin Richard, Auteur ; Christian Crémona, Auteur Année de publication : 2011 Article en page(s) : pp. 869-890 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Corrosion Damage Plasticity Steel/concrete interface Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Continuum damage mechanics allows accounting at the representative elementary volume for microcracks growth. Nowadays, describing the mechanical behavior of corroded structures remains of primary importance, especially when optimal maintenance policies have to be defined. Expressed within the framework of continuum damage mechanics, three constitutive models to describe the behavior of corroded steel, concrete and steel/concrete interface are exposed in this paper. To highlight the coupling use of these models, a bidimensional structural application is shown. It consists in a corroded RC beam subjected to a four-point bending test. Numerical results appear as encouraging for further developments. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Damage mechanics applied to the modelling of corroded reinforced concrete structures : Steel, concrete and interface [texte imprimé] / Frédéric Ragueneau, Auteur ; Benjamin Richard, Auteur ; Christian Crémona, Auteur . - 2011 . - pp. 869-890. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 869-890 Mots-clés : Corrosion Damage Plasticity Steel/concrete interface Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Continuum damage mechanics allows accounting at the representative elementary volume for microcracks growth. Nowadays, describing the mechanical behavior of corroded structures remains of primary importance, especially when optimal maintenance policies have to be defined. Expressed within the framework of continuum damage mechanics, three constitutive models to describe the behavior of corroded steel, concrete and steel/concrete interface are exposed in this paper. To highlight the coupling use of these models, a bidimensional structural application is shown. It consists in a corroded RC beam subjected to a four-point bending test. Numerical results appear as encouraging for further developments. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Uncertainty propagation on damage evolution of a concrete structure subjected to coupled leaching and creep / Thomas de Larrard in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 891-921 Titre : Uncertainty propagation on damage evolution of a concrete structure subjected to coupled leaching and creep Type de document : texte imprimé Auteurs : Thomas de Larrard, Auteur ; Benboudjema, Farid, Auteur ; Jean-Baptiste Colliat, Auteur Année de publication : 2011 Article en page(s) : pp. 891-921 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Leaching Creep Damage Variability Distribution Pearson correlation coefficient Decision tree Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We introduce a model for calcium leaching and creep strain evolution. Both phenomena are coupled for the estimation of the damage time evolution. Simulations are achieved so as to quantify the influence of the input parameters variability on the structure lifespan. The most influent parameters are identified and threshold values for lifespan classification are enlighted. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Uncertainty propagation on damage evolution of a concrete structure subjected to coupled leaching and creep [texte imprimé] / Thomas de Larrard, Auteur ; Benboudjema, Farid, Auteur ; Jean-Baptiste Colliat, Auteur . - 2011 . - pp. 891-921. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 891-921 Mots-clés : Leaching Creep Damage Variability Distribution Pearson correlation coefficient Decision tree Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : We introduce a model for calcium leaching and creep strain evolution. Both phenomena are coupled for the estimation of the damage time evolution. Simulations are achieved so as to quantify the influence of the input parameters variability on the structure lifespan. The most influent parameters are identified and threshold values for lifespan classification are enlighted. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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Why is it necessary to use a damage model to simulate the mechanical behavior of concrete under drying and leaching? / Thomas Rougelot in European journal of environmental and civil engineering, Vol. 14 N° 6-7 (Juin 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 923-935 Titre : Why is it necessary to use a damage model to simulate the mechanical behavior of concrete under drying and leaching? Type de document : texte imprimé Auteurs : Thomas Rougelot, Auteur ; Cheng Peng, Auteur ; Nicolas Burlion, Auteur Année de publication : 2011 Article en page(s) : pp. 923-935 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cementitious materials Drying Leaching Damage X-ray microtomography Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Short and long-term behaviors of concrete structures are of importance when dealing with durability aspects. One particular interesting aspect is the change in microstructure of concrete submitted to drying or leaching processes, and a potentially induced cracking pattern. Experimental investigations which focus on the effect of the dimensions of aggregates over cracks are proposed in this paper. The samples are submitted to accelerated leaching or to drying, and the evolution of their microstructure is regularly recorded by means of X-ray microtomography. A method is then proposed to study the cracking pattern, which appears to be greatly dependant of the size of inclusions. In particular, it appears that a larger diameter of inclusions tends to increase the crack opening. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] Why is it necessary to use a damage model to simulate the mechanical behavior of concrete under drying and leaching? [texte imprimé] / Thomas Rougelot, Auteur ; Cheng Peng, Auteur ; Nicolas Burlion, Auteur . - 2011 . - pp. 923-935. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 6-7 (Juin 2010) . - pp. 923-935 Mots-clés : Cementitious materials Drying Leaching Damage X-ray microtomography Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Short and long-term behaviors of concrete structures are of importance when dealing with durability aspects. One particular interesting aspect is the change in microstructure of concrete submitted to drying or leaching processes, and a potentially induced cracking pattern. Experimental investigations which focus on the effect of the dimensions of aggregates over cracks are proposed in this paper. The samples are submitted to accelerated leaching or to drying, and the evolution of their microstructure is regularly recorded by means of X-ray microtomography. A method is then proposed to study the cracking pattern, which appears to be greatly dependant of the size of inclusions. In particular, it appears that a larger diameter of inclusions tends to increase the crack opening. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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