Assessment of Pile Length Criteria for Monopile Foundations

Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review

Authors

  • Martin Achmus
  • Mauricio Marcelo Terceros Almanza
  • Florian tom Wörden
  • Klaus Thieken

Research Organisations

External Research Organisations

  • ACP Grundbau GmbH
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Details

Original languageEnglish
Title of host publicationOffshore Site Investigation Geotechnics
Subtitle of host publication8th International Conference Proceeding
Pages1140-1147
Number of pages8
Volume2
Publication statusPublished - 1 Jan 2017
EventOffshore Site Investigation and Geotechnics 2017 - London, United Kingdom (UK)
Duration: 12 Sept 2017 → 14 Sept 2017
Conference number: 8

Abstract

For the geotechnical monopile design of offshore wind turbines, the required embedded monopile length is commonly derived by so-called pile length criteria. As no clear procedure is specified by the current offshore guidelines, different criteria are used in design practice. Four often used pile length criteria are investigated by means of a comparative study on monopiles in homogenous sand. Herein, the influences of pile diameter and stiffness, load level and applied p-y approach on the outcome of the individual pile length criteria are discussed on basis of the head rotation due to characteristic ULS loads and the results of different ULS and SLS design proofs. Based on the identified inadequacies of the criteria, it is concluded that the consideration of a maximum pile head rotation is more suitable to reflect the pile stability due to cyclic load effects than existing criteria. However, the disregard of any pile length criterion is not in line with the DNVGL guideline and the EA-Pfähle recommendations and thus may induce problems in the certification and approval process.

Cite this

Assessment of Pile Length Criteria for Monopile Foundations. / Achmus, Martin; Terceros Almanza, Mauricio Marcelo; tom Wörden, Florian et al.
Offshore Site Investigation Geotechnics: 8th International Conference Proceeding. Vol. 2 2017. p. 1140-1147.

Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review

Achmus, M, Terceros Almanza, MM, tom Wörden, F & Thieken, K 2017, Assessment of Pile Length Criteria for Monopile Foundations. in Offshore Site Investigation Geotechnics: 8th International Conference Proceeding. vol. 2, pp. 1140-1147, Offshore Site Investigation and Geotechnics 2017, London, United Kingdom (UK), 12 Sept 2017. https://doi.org/10.3723/OSIG17.1140
Achmus, M., Terceros Almanza, M. M., tom Wörden, F., & Thieken, K. (2017). Assessment of Pile Length Criteria for Monopile Foundations. In Offshore Site Investigation Geotechnics: 8th International Conference Proceeding (Vol. 2, pp. 1140-1147) https://doi.org/10.3723/OSIG17.1140
Achmus M, Terceros Almanza MM, tom Wörden F, Thieken K. Assessment of Pile Length Criteria for Monopile Foundations. In Offshore Site Investigation Geotechnics: 8th International Conference Proceeding. Vol. 2. 2017. p. 1140-1147 doi: 10.3723/OSIG17.1140
Achmus, Martin ; Terceros Almanza, Mauricio Marcelo ; tom Wörden, Florian et al. / Assessment of Pile Length Criteria for Monopile Foundations. Offshore Site Investigation Geotechnics: 8th International Conference Proceeding. Vol. 2 2017. pp. 1140-1147
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abstract = "For the geotechnical monopile design of offshore wind turbines, the required embedded monopile length is commonly derived by so-called pile length criteria. As no clear procedure is specified by the current offshore guidelines, different criteria are used in design practice. Four often used pile length criteria are investigated by means of a comparative study on monopiles in homogenous sand. Herein, the influences of pile diameter and stiffness, load level and applied p-y approach on the outcome of the individual pile length criteria are discussed on basis of the head rotation due to characteristic ULS loads and the results of different ULS and SLS design proofs. Based on the identified inadequacies of the criteria, it is concluded that the consideration of a maximum pile head rotation is more suitable to reflect the pile stability due to cyclic load effects than existing criteria. However, the disregard of any pile length criterion is not in line with the DNVGL guideline and the EA-Pf{\"a}hle recommendations and thus may induce problems in the certification and approval process.",
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AU - Thieken, Klaus

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