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A finite element approach for determining the full load-displacement relationship of axially-loaded shallow screw anchors, incorporating installation effects

A finite element approach for determining the full load-displacement relationship of axially-loaded shallow screw anchors, incorporating installation effects
A finite element approach for determining the full load-displacement relationship of axially-loaded shallow screw anchors, incorporating installation effects
Screw anchors have been recognised as an innovative solution to support offshore jacket structures and floating systems, due to their low noise installation and potential enhanced uplift capacity. Results published in the literature have shown that for both fixed and floating applications, the tension capacity is critical for design but may be poorly predicted by current empirical design approaches. These methods also do not capture the load-displacement behaviour, which is critical for quantifying performance under working loads. In this paper, a Finite Element methodology has been developed to predict the full tensile load-displacement response of shallow screw anchors installed in sand for practical use, incorporating the effects of a pitch-matched installation. The methodology is based on a two-step process. An initial simulation, based on wished-in-place conditions, enables the identification of the failure mechanism as well as the shear strain distribution at failure. A second simulation refines the anchor capacity using soil-soil interface finite elements along the failure surface previously identified and also models installation through successive loading/unloading of the screw anchor at different embedment depths. The methodology is validated against previously published centrifuge test results. A simplified numerical approach has been derived to approximate the results in a single step.
Screw anchor, Helical Pile, Sand, Finite element modelling, Design
0008-3674
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Brown, Michael
db84010d-8302-4dfc-963c-85f10de704d7
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Al-Baghdadi, Therar
3e090e48-a90a-4baf-ba78-9b359c2c7475
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8
Brennan, Andrew
ed8e82a5-2c8d-4826-851f-d31cd1c87eb2
Augarde, Charles
c1f68178-6d2e-4b5a-a145-4ee13e039701
Coombs, William M.
5a2b2d9b-641e-47f1-a928-a0ad6a09a764
Wang, Lei
7843a105-f578-4ce4-a4fb-57f7b3f15f2c
Blake, Anthony
e0438bea-cfc4-4373-b100-8b9768ddc56f
Richards, David J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Ball, Jonathan David
1baa9903-fa72-4703-ac2c-cdca5498bf8b
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Brown, Michael
db84010d-8302-4dfc-963c-85f10de704d7
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Al-Baghdadi, Therar
3e090e48-a90a-4baf-ba78-9b359c2c7475
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8
Brennan, Andrew
ed8e82a5-2c8d-4826-851f-d31cd1c87eb2
Augarde, Charles
c1f68178-6d2e-4b5a-a145-4ee13e039701
Coombs, William M.
5a2b2d9b-641e-47f1-a928-a0ad6a09a764
Wang, Lei
7843a105-f578-4ce4-a4fb-57f7b3f15f2c
Blake, Anthony
e0438bea-cfc4-4373-b100-8b9768ddc56f
Richards, David J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Ball, Jonathan David
1baa9903-fa72-4703-ac2c-cdca5498bf8b

Cerfontaine, Benjamin, Knappett, Jonathan, Brown, Michael, Davidson, Craig, Al-Baghdadi, Therar, Sharif, Yaseen, Brennan, Andrew, Augarde, Charles, Coombs, William M., Wang, Lei, Blake, Anthony, Richards, David J. and Ball, Jonathan David (2020) A finite element approach for determining the full load-displacement relationship of axially-loaded shallow screw anchors, incorporating installation effects. Canadian Geotechnical Journal. (doi:10.1139/cgj-2019-0548).

Record type: Article

Abstract

Screw anchors have been recognised as an innovative solution to support offshore jacket structures and floating systems, due to their low noise installation and potential enhanced uplift capacity. Results published in the literature have shown that for both fixed and floating applications, the tension capacity is critical for design but may be poorly predicted by current empirical design approaches. These methods also do not capture the load-displacement behaviour, which is critical for quantifying performance under working loads. In this paper, a Finite Element methodology has been developed to predict the full tensile load-displacement response of shallow screw anchors installed in sand for practical use, incorporating the effects of a pitch-matched installation. The methodology is based on a two-step process. An initial simulation, based on wished-in-place conditions, enables the identification of the failure mechanism as well as the shear strain distribution at failure. A second simulation refines the anchor capacity using soil-soil interface finite elements along the failure surface previously identified and also models installation through successive loading/unloading of the screw anchor at different embedment depths. The methodology is validated against previously published centrifuge test results. A simplified numerical approach has been derived to approximate the results in a single step.

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More information

e-pub ahead of print date: 30 June 2020
Keywords: Screw anchor, Helical Pile, Sand, Finite element modelling, Design

Identifiers

Local EPrints ID: 444163
URI: http://eprints.soton.ac.uk/id/eprint/444163
ISSN: 0008-3674
PURE UUID: c8d4384e-3d5a-4efc-b8b3-a613c6aa2fb9
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

Date deposited: 29 Sep 2020 17:40
Last modified: 16 Sep 2021 11:14

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Contributors

Author: Jonathan Knappett
Author: Michael Brown
Author: Craig Davidson
Author: Therar Al-Baghdadi
Author: Yaseen Sharif
Author: Andrew Brennan
Author: Charles Augarde
Author: William M. Coombs
Author: Lei Wang
Author: Anthony Blake
Author: Jonathan David Ball

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