A model for the computation of engineering earth structures to a seismic motion / Yoann Bagagli in European journal of environmental and civil engineering, Vol. 14 N° 5 (Mai 2010)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 14 N° 5 (Mai 2010) . - pp. 599-616 Titre : A model for the computation of engineering earth structures to a seismic motion Type de document : texte imprimé Auteurs : Yoann Bagagli, Auteur ; Eric Vincens, Auteur ; Jean-Jacques Fry, Auteur Année de publication : 2011 Article en page(s) : pp. 599-616 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Liquefaction Soil Earthquake Hysteretic law Densification San Fernando Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Under cyclic loading, vulnerable soil structures are prone to experience liquefaction. Actually, their typical contractive behaviour can lead, under a deviatoric loading and constant volume condition, to a pore pressure build up which may cause an important or total loss of the shear resistance. BRO model, which is able to model this phenomenon, differs from the other soil models devoted to seismic computation by a simple identification procedure for the model parameters. It makes it convenient for the use of engineers. BRO model used to present a lack of robustness, it has been improved and then tested on San Fernando dam during the same-named seismic event in 1971. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp [article] A model for the computation of engineering earth structures to a seismic motion [texte imprimé] / Yoann Bagagli, Auteur ; Eric Vincens, Auteur ; Jean-Jacques Fry, Auteur . - 2011 . - pp. 599-616. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 14 N° 5 (Mai 2010) . - pp. 599-616 Mots-clés : Liquefaction Soil Earthquake Hysteretic law Densification San Fernando Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : Under cyclic loading, vulnerable soil structures are prone to experience liquefaction. Actually, their typical contractive behaviour can lead, under a deviatoric loading and constant volume condition, to a pore pressure build up which may cause an important or total loss of the shear resistance. BRO model, which is able to model this phenomenon, differs from the other soil models devoted to seismic computation by a simple identification procedure for the model parameters. It makes it convenient for the use of engineers. BRO model used to present a lack of robustness, it has been improved and then tested on San Fernando dam during the same-named seismic event in 1971. DEWEY : 624 ISSN : 1964-8189 En ligne : http://ejece.revuesonline.com/resnum.jsp

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The characteristic state / Eric Vincens in European journal of environmental and civil engineering, Vol. 16 N° 7 (Juillet 2012)  

Public ISBD [article]  inEuropean journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 777-794 Titre : The characteristic state Type de document : texte imprimé Auteurs : Eric Vincens, Auteur ; Cécile Nouguier-Lehon, Auteur Année de publication : 2012 Article en page(s) : pp. 777-794 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : DEM Granular material Aspect ratio Cycles Biaxial test Anisotropy Résumé : Simulations of cyclic biaxial tests on samples composed of 2D irregular polygonal particles were performed to investigate the properties of the characteristic state, transition state between contraction and dilation. Two aspect ratios of 2D angular particules and different states of initial fabric are considered. The stress ratio at characteristic state is found to be much more sensitive to initial anisotropy than to density changes. Fabric is the kind of anisotropy that seems to influence the most the characteristic state. Constant amplitude cycling does not erase the influence of the initial anisotropy of fabric which was not expected. Then, in the framework of usual soil modelling where the material is supposed to be in an initially isotropic state, the usual models for the characteristic state are only valid for constant cyclic strain amplitude loadings where the mean anisotropy throughout the cycles remains low. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.671057 [article] The characteristic state [texte imprimé] / Eric Vincens, Auteur ; Cécile Nouguier-Lehon, Auteur . - 2012 . - pp. 777-794. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 777-794 Mots-clés : DEM Granular material Aspect ratio Cycles Biaxial test Anisotropy Résumé : Simulations of cyclic biaxial tests on samples composed of 2D irregular polygonal particles were performed to investigate the properties of the characteristic state, transition state between contraction and dilation. Two aspect ratios of 2D angular particules and different states of initial fabric are considered. The stress ratio at characteristic state is found to be much more sensitive to initial anisotropy than to density changes. Fabric is the kind of anisotropy that seems to influence the most the characteristic state. Constant amplitude cycling does not erase the influence of the initial anisotropy of fabric which was not expected. Then, in the framework of usual soil modelling where the material is supposed to be in an initially isotropic state, the usual models for the characteristic state are only valid for constant cyclic strain amplitude loadings where the mean anisotropy throughout the cycles remains low. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.671057

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