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Three-dimensional damage model for concrete. I / Yu Liu in Journal of engineering mechanics, Vol. 134 N°1 (Janvier 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 N°1 (Janvier 2008) Titre : Three-dimensional damage model for concrete. I : Theory Type de document : texte imprimé Auteurs : Yu Liu, Auteur ; Susanto Teng, Auteur ; Chee-Kiong Soh, Auteur Année de publication : 2008 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Concrete  Constitutive  models  Cracking  Damage  Three-dimensional  models Résumé : A damage model for concrete is proposed based on the existing displacement equivalence-based model for brittle materials. The model is established in a randomly selected coordinate system so as to consider the cases where the principal directions of damage do not coincide with those of stress and strain. The effect of shear stress is also considered. The slipping cracks of concrete under triaxial compression and the stiffness reduction under hydrostatic compression are also taken into account. The friction at crack tips has been introduced to account for the permanent deformation and a blend of elastic and secant unloading/reloading routine is obtained. The evolution rule of damage is combined with the predefined basic damage evolution patterns. ISSN : 0733-9399 En ligne : http://cedb.asce.org/cgi/WWWdisplay.cgi?161981 [article] Three-dimensional damage model for concrete. I : Theory [texte imprimé] / Yu Liu, Auteur ; Susanto Teng, Auteur ; Chee-Kiong Soh, Auteur . - 2008. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N°1 (Janvier 2008) Mots-clés : Concrete  Constitutive  models  Cracking  Damage  Three-dimensional  models Résumé : A damage model for concrete is proposed based on the existing displacement equivalence-based model for brittle materials. The model is established in a randomly selected coordinate system so as to consider the cases where the principal directions of damage do not coincide with those of stress and strain. The effect of shear stress is also considered. The slipping cracks of concrete under triaxial compression and the stiffness reduction under hydrostatic compression are also taken into account. The friction at crack tips has been introduced to account for the permanent deformation and a blend of elastic and secant unloading/reloading routine is obtained. The evolution rule of damage is combined with the predefined basic damage evolution patterns. ISSN : 0733-9399 En ligne : http://cedb.asce.org/cgi/WWWdisplay.cgi?161981

Three-dimensional damage model for concrete. II / Yu Liu in Journal of engineering mechanics, Vol. 134 N°1 (Janvier 2008) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 134 N°1 (Janvier 2008) . - pp.82-89 Titre : Three-dimensional damage model for concrete. II : Verification Type de document : texte imprimé Auteurs : Yu Liu, Auteur ; Susanto Teng, Auteur ; Chee-Kiong Soh, Auteur Année de publication : 2008 Article en page(s) : pp.82-89 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Concrete  Constitutive  models  Cracking  Three-dimensional  models  Damage Résumé : A three-dimensional damage model for concrete has been proposed in the preceding paper, Part I: Theory. This paper focuses on the application of the damage model for quasi-brittle materials such as concrete. The determination of model parameters for the evolution rule of damage is discussed. The model parameters to consider the frictional stress and the stiffness reduction under hydrostatic compression are also studied. For verification, the proposed model is applied to concrete subjected to confined compression, triaxial, loading, and cyclic loading. Consistent results, as compared with other researchers’ experimental data, were obtained, and the proposed model is considered worthy of further research work. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A1%2882 [...] [article] Three-dimensional damage model for concrete. II : Verification [texte imprimé] / Yu Liu, Auteur ; Susanto Teng, Auteur ; Chee-Kiong Soh, Auteur . - 2008 . - pp.82-89. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 134 N°1 (Janvier 2008) . - pp.82-89 Mots-clés : Concrete  Constitutive  models  Cracking  Three-dimensional  models  Damage Résumé : A three-dimensional damage model for concrete has been proposed in the preceding paper, Part I: Theory. This paper focuses on the application of the damage model for quasi-brittle materials such as concrete. The determination of model parameters for the evolution rule of damage is discussed. The model parameters to consider the frictional stress and the stiffness reduction under hydrostatic compression are also studied. For verification, the proposed model is applied to concrete subjected to confined compression, triaxial, loading, and cyclic loading. Consistent results, as compared with other researchers’ experimental data, were obtained, and the proposed model is considered worthy of further research work. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282008%29134%3A1%2882 [...]