| Titre : | Effect of footing width on bearing capacity factor Nγ for smooth strip footings (2008) |
| Auteurs : | Jyant Kumar, Auteur ; V. N. Khatri, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of geotechnical and geoenvironmental engineering (Vol. 134 n°9, Septembre 2008) |
| Article en page(s) : | pp. 1299–1310 |
| Note générale : | Geotechnical and geoenvironmental engineering |
| Langues : | Anglais |
| Tags : | 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%281299%29 |
