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Optimisation of screw anchor lateral capacity in sand for offshore renewable energy applications

Optimisation of screw anchor lateral capacity in sand for offshore renewable energy applications
Optimisation of screw anchor lateral capacity in sand for offshore renewable energy applications
Screw piles or screw anchors are a promising solution to anchor floating offshore renewable energy devices, such as wind turbines or tidal turbines. The installation generates limited noise (driven piles are noisy) and can be undertaken in all soil conditions. Although they are mainly used for their large uplift capacities, screw anchors can also be designed to provide significant lateral resistance. The optimisation of screw anchor design does not rely only on the geotechnical assessment of the uplift capacity based on soil strength, but also on operational (installation requirements) and structural (helix bending, core section stress, limiting steel plate thickness) constraints. This paper develops a methodology for the design optimisation of screw anchors under lateral loading in dense sand, incorporating all of these constraints, based on simplified analytical or semi-analytical approaches. The results show that it is possible to optimise the anchor design, maximising the anchor lateral capacity, whilst minimising the anchor weight. The maximum embedment depth and then the anchor capacity is mainly limited by the maximum torque available during installation and the short-pile to long-pile failure mechanism transition respectively.
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Brown, Michael
4aec31d6-db86-4d2d-98b4-4c52bc30e16d
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Brown, Michael
4aec31d6-db86-4d2d-98b4-4c52bc30e16d
Knappett, Jonathan
cda30027-553d-4310-8a05-e48d8989a545
Davidson, Craig
972704f2-5a32-4469-ad4f-358c60ef8de2
Sharif, Yaseen
f8ed0802-9644-479f-b288-77dec7624aa8

Cerfontaine, Benjamin, Brown, Michael, Knappett, Jonathan, Davidson, Craig and Sharif, Yaseen (2020) Optimisation of screw anchor lateral capacity in sand for offshore renewable energy applications. In Proceedings of the 4th International Symposium on Frontiers in Offshore Geotechnics.

Record type: Conference or Workshop Item (Paper)

Abstract

Screw piles or screw anchors are a promising solution to anchor floating offshore renewable energy devices, such as wind turbines or tidal turbines. The installation generates limited noise (driven piles are noisy) and can be undertaken in all soil conditions. Although they are mainly used for their large uplift capacities, screw anchors can also be designed to provide significant lateral resistance. The optimisation of screw anchor design does not rely only on the geotechnical assessment of the uplift capacity based on soil strength, but also on operational (installation requirements) and structural (helix bending, core section stress, limiting steel plate thickness) constraints. This paper develops a methodology for the design optimisation of screw anchors under lateral loading in dense sand, incorporating all of these constraints, based on simplified analytical or semi-analytical approaches. The results show that it is possible to optimise the anchor design, maximising the anchor lateral capacity, whilst minimising the anchor weight. The maximum embedment depth and then the anchor capacity is mainly limited by the maximum torque available during installation and the short-pile to long-pile failure mechanism transition respectively.

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More information

Published date: September 2020

Identifiers

Local EPrints ID: 452773
URI: http://eprints.soton.ac.uk/id/eprint/452773
PURE UUID: 81c85cfd-4f0c-4829-8dd0-5532fb5adcd3
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

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Date deposited: 20 Dec 2021 17:33
Last modified: 21 Dec 2021 02:52

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Contributors

Author: Michael Brown
Author: Jonathan Knappett
Author: Craig Davidson
Author: Yaseen Sharif

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