Effect of footing width on bearing capacity factor Nγ for smooth strip footings / Jyant Kumar in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°9 (Septembre 2008)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 134 n°9 (Septembre 2008) . - pp. 1299–1310 Titre : Effect of footing width on bearing capacity factor Nγ for smooth strip footings Type de document : texte imprimé Auteurs : Jyant Kumar, Auteur ; V. N. Khatri, Auteur Année de publication : 2008 Article en page(s) : pp. 1299–1310 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Footings Bearing capacity Failures Foundations Limit analysis Numerical Optimization Résumé : By incorporating the variation of soil friction angle (ϕ) with mean principal stress (σm) , the effect of footing width (B) on bearing capacity factor Nγ was examined for a smooth strip footing placed on a granular medium without any surcharge pressure. The analysis was performed by means of a numerical lower bound limit analysis in conjunction with finite-elements and linear programming. An iterative computational procedure was framed to account for the dependency of ϕ on σm . Two well-defined ϕ–σm curves from literature associated with Hoston and Toyora sands, corresponding to relative density of 18 and 74.5%, respectively, were used. The magnitude of Nγ was obtained for different footing widths, covering almost the entire range of model and field footing sizes. It was noted that for B greater than about 0.4m , it is possible to relate Nγ with B approximately in a linear fashion on a log–log scale. Further, it was seen that if an average value of ϕ along the footing–soil interface is obtained, it is possible to estimate a reasonable magnitude of Nγ for a given footing width provided the relationship between ϕ and σm is specified for the given material. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A9%2812 [...] [article] Effect of footing width on bearing capacity factor Nγ for smooth strip footings [texte imprimé] / Jyant Kumar, Auteur ; V. N. Khatri, Auteur . - 2008 . - pp. 1299–1310. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°9 (Septembre 2008) . - pp. 1299–1310 Mots-clés : Footings Bearing capacity Failures Foundations Limit analysis Numerical Optimization Résumé : By incorporating the variation of soil friction angle (ϕ) with mean principal stress (σm) , the effect of footing width (B) on bearing capacity factor Nγ was examined for a smooth strip footing placed on a granular medium without any surcharge pressure. The analysis was performed by means of a numerical lower bound limit analysis in conjunction with finite-elements and linear programming. An iterative computational procedure was framed to account for the dependency of ϕ on σm . Two well-defined ϕ–σm curves from literature associated with Hoston and Toyora sands, corresponding to relative density of 18 and 74.5%, respectively, were used. The magnitude of Nγ was obtained for different footing widths, covering almost the entire range of model and field footing sizes. It was noted that for B greater than about 0.4m , it is possible to relate Nγ with B approximately in a linear fashion on a log–log scale. Further, it was seen that if an average value of ϕ along the footing–soil interface is obtained, it is possible to estimate a reasonable magnitude of Nγ for a given footing width provided the relationship between ϕ and σm is specified for the given material. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A9%2812 [...]

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