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Large-deformation numerical modeling of short-term compression and uplift capacity of offshore shallow foundations

Large-deformation numerical modeling of short-term compression and uplift capacity of offshore shallow foundations
Large-deformation numerical modeling of short-term compression and uplift capacity of offshore shallow foundations

Large-deformation finite-element analysis has been used to model the undrained response of skirted shallow foundations in uplift and compression. Large-deformation effects involve changes in embedment ratio and operative local soil shear strength with increasing foundation displacement-either in tension or compression. Centrifuge model testing has shown that these changes in geometry affect the mobilized bearing capacity and the kinematic mechanisms governing failure in undrained uplift and compression. Small-strain finite-element analysis cannot by definition capture the effects of changing foundation embedment ratio and variation in local soil strength with foundation displacement. In this paper, load-displacement relationships, ultimate capacities, and kinematic mechanisms governing failure from largedeformation finite-element analyses are compared with centrifuge model test results for circular skirted foundations with a range of embedment between 10 and 50% of the foundation diameter. The results show that the large-deformation finite-element method can replicate the loaddisplacement response of the foundations over large displacements, pre-and postyield, and also capture differences in the soil deformation patterns in uplift and compression. The findings from this study increase confidence in using advanced numerical methods for determining shallow skirted foundation behavior, particularly for load paths involving uplift.

Centrifuge models, Clays, Collapse loads, Finite-element method, Offshore structures, Soil deformation
1090-0241
Chatterjee, Santiram
50e15a93-fc89-47c0-b34f-d7fd389bcfcb
Mana, Divya S.K.
14fc0e59-d5c5-4af9-a0d9-0f18976f6f6b
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633
Chatterjee, Santiram
50e15a93-fc89-47c0-b34f-d7fd389bcfcb
Mana, Divya S.K.
14fc0e59-d5c5-4af9-a0d9-0f18976f6f6b
Gourvenec, Susan
6ff91ad8-1a91-42fe-a3f4-1b5d6f5ce0b8
Randolph, Mark F.
75caa33a-e630-4ae8-84cd-758797bf9633

Chatterjee, Santiram, Mana, Divya S.K., Gourvenec, Susan and Randolph, Mark F. (2014) Large-deformation numerical modeling of short-term compression and uplift capacity of offshore shallow foundations. Journal of Geotechnical and Geoenvironmental Engineering, 140 (3), [04013021]. (doi:10.1061/(ASCE)GT.1943-5606.0001043).

Record type: Article

Abstract

Large-deformation finite-element analysis has been used to model the undrained response of skirted shallow foundations in uplift and compression. Large-deformation effects involve changes in embedment ratio and operative local soil shear strength with increasing foundation displacement-either in tension or compression. Centrifuge model testing has shown that these changes in geometry affect the mobilized bearing capacity and the kinematic mechanisms governing failure in undrained uplift and compression. Small-strain finite-element analysis cannot by definition capture the effects of changing foundation embedment ratio and variation in local soil strength with foundation displacement. In this paper, load-displacement relationships, ultimate capacities, and kinematic mechanisms governing failure from largedeformation finite-element analyses are compared with centrifuge model test results for circular skirted foundations with a range of embedment between 10 and 50% of the foundation diameter. The results show that the large-deformation finite-element method can replicate the loaddisplacement response of the foundations over large displacements, pre-and postyield, and also capture differences in the soil deformation patterns in uplift and compression. The findings from this study increase confidence in using advanced numerical methods for determining shallow skirted foundation behavior, particularly for load paths involving uplift.

Text
2014 ASCE J. Geotechnical and Geoenvironmental Engng 140_3 Chatterjee et al. - Accepted Manuscript
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More information

Accepted/In Press date: 16 September 2013
e-pub ahead of print date: 18 September 2013
Published date: March 2014
Keywords: Centrifuge models, Clays, Collapse loads, Finite-element method, Offshore structures, Soil deformation

Identifiers

Local EPrints ID: 414518
URI: http://eprints.soton.ac.uk/id/eprint/414518
ISSN: 1090-0241
PURE UUID: 5f38d8f6-8a94-456c-8faf-c1dd1d1b8a4f
ORCID for Susan Gourvenec: ORCID iD orcid.org/0000-0002-2628-7914

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Date deposited: 03 Oct 2017 16:31
Last modified: 06 Jun 2024 02:00

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Contributors

Author: Santiram Chatterjee
Author: Divya S.K. Mana
Author: Susan Gourvenec ORCID iD
Author: Mark F. Randolph

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