Effect of Footing Width on Bearing Capacity Factor for Smooth Strip Footings
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 134, Issue 9
Abstract
By incorporating the variation of soil friction angle with mean principal stress , the effect of footing width on bearing capacity factor 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 on . Two well-defined curves from literature associated with Hoston and Toyora sands, corresponding to relative density of 18 and 74.5%, respectively, were used. The magnitude of was obtained for different footing widths, covering almost the entire range of model and field footing sizes. It was noted that for greater than about , it is possible to relate with approximately in a linear fashion on a log–log scale. Further, it was seen that if an average value of along the footing–soil interface is obtained, it is possible to estimate a reasonable magnitude of for a given footing width provided the relationship between and is specified for the given material.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 134 • Issue 9 • September 2008
Pages: 1299 - 1310
Copyright
© 2008 ASCE.
History
Received: Aug 20, 2007
Accepted: Feb 13, 2008
Published online: Sep 1, 2008
Published in print: Sep 2008
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