Influence of scour on soil-structure interaction of tripod supported offshore wind turbines

K A Abhinav, Nilanjan Saha

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

Offshore wind is expected to play a major role in sustaining the drive for renewable energy around the globe. Tripods are suitable support structures for offshore wind turbines in intermediate water depths (20 - 50m). While power production is stopped and the turbine is shut down during extreme sea states, it is essential that the integrity of the structure is not compromised by the incident waves. Existing literature seldom focuses on soil-structure-interaction, by assuming that the structure is fixed at the mudline. The present work makes use of a sequentially coupled scheme of aerodynamic-hydrodynamic analysis to investigate the influence of extreme sea states on the response of a tripod structure, supporting a 5-MW offshore wind turbine (OWT).

Sandy soil profiles are represented by means of discrete axial and lateral springs along the piles. The finite element method is used in the analysis. The lateral response characteristics of the OWT structure are found to be heavily influenced by the density classification of the sand. Scour susceptibility studies indicate the need for adequate protection at the pile-mudline interface, to combat the corresponding reduction in natural frequency and escalation of response.
Original languageEnglish
Number of pages6
Publication statusPublished - 24 Oct 2016
Event3rd Asian Wave and Tidal Energy Conference - Marina Bay Sands, Singapore, Singapore
Duration: 24 Oct 201628 Oct 2016
Conference number: 3
http://www.awtec.asia/awtec-2016/
https://www.awtec-headoffice.com/awtec-2016

Conference

Conference3rd Asian Wave and Tidal Energy Conference
Abbreviated titleAWTEC 2016
CountrySingapore
CitySingapore
Period24/10/1628/10/16
Internet address

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Keywords

  • offshore wind turbine
  • tripod support structure
  • soil-structure interaction

Cite this

Abhinav, K. A., & Saha, N. (2016). Influence of scour on soil-structure interaction of tripod supported offshore wind turbines. Paper presented at 3rd Asian Wave and Tidal Energy Conference, Singapore, Singapore.