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

Benjamin Cerfontaine (Lead / Corresponding author), Jonathan Knappett, Michael Brown, Craig Davidson, Therar Al-Baghdadi, Yaseen Sharif, Andrew Brennan, Charles Augarde, William M. Coombs, Lei Wang, Anthony Blake, David J. Richards, Jonathan David Ball

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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.
Original languageEnglish
JournalCanadian Geotechnical Journal
Early online date30 Jun 2020
DOIs
Publication statusE-pub ahead of print - 30 Jun 2020

Keywords

  • Screw anchor
  • Helical Pile
  • Sand
  • Finite element modelling
  • Design

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    On Lagrangian mechanics and the implicit material point method for large deformation elasto-plasticity

    Coombs, W. M., Augarde, C., Brown, M., Brennan, A., Charlton, T., Knappett, J., Motlagh, Y. & Wang, L., 1 Jan 2020, In : Computer Methods in Applied Mechanics and Engineering. 358, p. 1-32 32 p., 112622.

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    Design of plate and screw anchors in dense sand: failure mechanism, capacity and deformation

    Cerfontaine, B., Knappett, J., Brown, M. & Bradsaw, A. S., 25 Jun 2019, 7th International Symposium on Deformation Characteristics of Geomaterials (IS-Glasgow 2019). Tarantino, A. & Ibraim, E. (eds.). 2019 ed. EDP Sciences, Vol. 92. p. 1-6 6 p. 16010. (E3S Web of Conferences; vol. 92).

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    Effect of soil deformability on the failure mechanism of shallow plate or screw anchors in sand

    Cerfontaine, B., Knappett, J., Brown, M. & Bradsaw, A. S., May 2019, In : Computers and Geotechnics. 109, p. 34-45 12 p.

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