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Dependency of N-gamma on footing diameter for circular footings

Chakraborty, Debarghya and Kumar, Jyant (2013) Dependency of N-gamma on footing diameter for circular footings. In: SOILS AND FOUNDATIONS, 53 (1). pp. 173-180.

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Official URL: http://dx.doi.org/10.1016/j.sandf.2012.12.013


By incorporating a variation in soil internal friction angle phi with mean principal stress sigma(m) the dependency of bearing capacity factor N-gamma with footing diameter B has been evaluated for circular footings. The evaluation has been performed by a lower bound finite element limit analysis in combination with a linear optimization. Two phi-sigma(m) curves, available from literature, were used. The magnitude of N-gamma has been computed for several footing diameters, covering almost the entire possible range of model and field footing sizes. Factor N-gamma is seen to decrease significantly with an increase in B. For B approximately greater than (i) 0.7 m for smooth footings (delta=0) and (ii) 0.35 m for rough footings (delta=phi), N-gamma varies almost linearly with B on a log log scale. Once a relationship has been generated between N-gamma and B, for a given design load, the required footing diameter can always be obtained. (C) 2013 The Japanese Geotechnical Society. Production and hosting by Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the JAPANESE GEOTECHNICAL SOC, SUGAYAMA BLDG 4F, KANDA AWAJI-CHO 2-23, CHIYODA-KU, TOKYO, 101-0063, JAPAN
Keywords: Bearing capacity; Circular footing; Limit analysis; Optimization; Plasticity
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 12 Jul 2016 09:08
Last Modified: 12 Jul 2016 09:08
URI: http://eprints.iisc.ac.in/id/eprint/54177

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