3D FE dynamic modelling of offshore wind turbines in sand: natural frequency evolution in the pre– to after-storm transition

E. Kementzetzidis, Willem Geert Versteijlen, Axel Nernheim, Federico Pisano

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

2 Citations (Scopus)
210 Downloads (Pure)

Abstract

3D non-linear finite element analyses are proving increasingly beneficial to analyse the foundations of offshore wind turbines (OWTs) in combination with advanced soil modelling. For this purpose, the well-known SANISAND04 bounding surface plasticity model (Dafalias & Manzari 2004) is adopted in this work to incorporate key aspects of critical state soil mechanics into the analysis of monopile foundations in sand. The final 3D soil-foundation-OWT model is exploited to simulate the response of an 8 MW OWT to a long loading history of approximately 2 hours duration. The scope is to investigate/explain the drops in natural frequency observed in the field during storms, as well as its subsequent recovery. The numerical results point out a strong connection between transient frequency drops and pore pressure accumulation, whereas the original OWT natural frequency seems to be restored as a consequence of post-storm re-consolidation.
Original languageEnglish
Title of host publication9th European Conference on Numerical Methods in Geotechnical Engineering
EditorsAntónio S. Cardoso, José L. Borges, Pedro A. Costa, António T. Gomes, José C. Marques, Castorina S. Vieira
Place of PublicationPorto, Portugal
Pages1477-1484
Number of pages8
Volume2
Publication statusPublished - 27 Jun 2018
EventNUMGE 2018: 9th European Conference on Numerical Methods in Geotechnical Engineering - Porto, Portugal
Duration: 25 Jun 201827 Jun 2018
Conference number: 9
http://www.numge2018.pt/

Conference

ConferenceNUMGE 2018: 9th European Conference on Numerical Methods in Geotechnical Engineering
Abbreviated titleNUMGE 2018
CountryPortugal
CityPorto
Period25/06/1827/06/18
Internet address

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