Finite-Element Limit Analysis of Strip and Circular Skirted Footings on Sand

Khatri, Nandkishor Vishwas and Kumar, Jyant (2019) Finite-Element Limit Analysis of Strip and Circular Skirted Footings on Sand. In: INTERNATIONAL JOURNAL OF GEOMECHANICS, 19 (3).

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Abstract

The lower- and upper-bound theorems of the limit analysis have been used in conjunction with finite elements and second-order cone programming (SOCP) for determining the bearing capacity of strip and circular skirted footings on sand. The analysis follows the Mohr-Coulomb's yield criterion and the associated flow rule; sand is not usually considered to obey this rule, but the results of using it are discussed. The friction angle of sand was varied between 30 and 45 degrees, and the depth (D-s) of the skirt increased from 0.25 to 2B; here B implies: (1) the width of a skirted strip footing, and (2) the diameter of a circular skirted footing. The results are expressed in terms of the bearing capacity ratio (BCR): the ratio of the bearing capacities of a skirted footing to that of the surface footing, with the same value of B but without any skirt element. The results reveal that the magnitude of the BCR increases quite extensively with an increase in the value of D-s/B. The skirted footing was found to be especially quite advantageous for loose sand. With the same D-s/B, the BCR for a circular skirted footing was found to be substantially greater than that for the strip skirted footing.

Item Type:	Journal Article
Publication:	INTERNATIONAL JOURNAL OF GEOMECHANICS
Publisher:	ASCE-AMER SOC CIVIL ENGINEERS
Additional Information:	Copyright of this article belongs to ASCE-AMER SOC CIVIL ENGINEERS
Keywords:	Bearing capacity; Limit analysis; Optimization; Foundations; Skirted footing; Sand
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	08 Feb 2019 06:12
Last Modified:	08 Feb 2019 06:12
URI:	http://eprints.iisc.ac.in/id/eprint/61629

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