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

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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.
Original languageEnglish
Title of host publicationProceedings of the 4th International Symposium on Frontiers in Offshore Geotechnics
PublisherDeep Foundations Institute
Publication statusPublished - Sep 2020
Event4th International Symposium on Frontiers in Offshore Geotechnics (ISFOG 2020). - Austin, Texas, United States
Duration: 16 Aug 202019 Aug 2020
https://www.isfog2020.org/

Conference

Conference4th International Symposium on Frontiers in Offshore Geotechnics (ISFOG 2020).
Abbreviated titleISFOF2020
CountryUnited States
CityTexas
Period16/08/2019/08/20
Internet address

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  • Developing screw piles for offshore renewable energy application

    Brown, M. J., Davidson, C., Cerfontaine, B., Ciantia, M., Knappett, J. & Brennan, A., 2020, Advances in Offshore Geotechnics: Proceedings of ISOG2019. Haldar, S., Patra, S. & Ghanekar, R. K. (eds.). Singapore: Springer , p. 101-119 19 p. (Lecture Notes in Civil Engineering; vol. 92).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 99 Downloads (Pure)
  • Effects of screw pile installation on installation requirements and in-service performance using the Discrete Element Method

    Sharif, Y., Brown, M., Cerfontaine, B., Davidson, C., Ciantia, M., Knappett, J., Brennan, A., Ball, J. D., Augarde, C., Coombs, W. M., Blake, A., Richards, D., White, D., Huisman, M. & Ottolini, M., 27 Oct 2020, In : Canadian Geotechnical Journal.

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