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

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 volume › Conference contribution › Scientific › peer-review

10 Citations (Scopus)

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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 language	English
Title of host publication	9th European Conference on Numerical Methods in Geotechnical Engineering
Editors	António S. Cardoso, José L. Borges, Pedro A. Costa, António T. Gomes, José C. Marques, Castorina S. Vieira
Place of Publication	Porto, Portugal
Pages	1477-1484
Number of pages	8
Volume	2
Publication status	Published - 27 Jun 2018
Event	NUMGE 2018: 9th European Conference on Numerical Methods in Geotechnical Engineering - Porto, Portugal Duration: 25 Jun 2018 → 27 Jun 2018 Conference number: 9 http://www.numge2018.pt/

Conference

Conference	NUMGE 2018: 9th European Conference on Numerical Methods in Geotechnical Engineering
Abbreviated title	NUMGE 2018
Country/Territory	Portugal
City	Porto
Period	25/06/18 → 27/06/18
Internet address	http://www.numge2018.pt/

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Kementzetzidis, E., Versteijlen, W. G., Nernheim, A., & Pisano, F. (2018). 3D FE dynamic modelling of offshore wind turbines in sand: natural frequency evolution in the pre– to after-storm transition. In A. S. Cardoso, J. L. Borges, P. A. Costa, A. T. Gomes, J. C. Marques, & C. S. Vieira (Eds.), 9th European Conference on Numerical Methods in Geotechnical Engineering (Vol. 2, pp. 1477-1484).

Kementzetzidis, E. ; Versteijlen, Willem Geert ; Nernheim, Axel et al. / 3D FE dynamic modelling of offshore wind turbines in sand: natural frequency evolution in the pre– to after-storm transition. 9th European Conference on Numerical Methods in Geotechnical Engineering. editor / António S. Cardoso ; José L. Borges ; Pedro A. Costa ; António T. Gomes ; José C. Marques ; Castorina S. Vieira. Vol. 2 Porto, Portugal, 2018. pp. 1477-1484

@inproceedings{be36301002d94896bab6161e4e85f9ff,

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

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.",

author = "E. Kementzetzidis and Versteijlen, {Willem Geert} and Axel Nernheim and Federico Pisano",

year = "2018",

month = jun,

day = "27",

language = "English",

isbn = "9781138544468",

volume = "2",

pages = "1477--1484",

editor = "Cardoso, {Ant{\'o}nio S.} and Borges, {Jos{\'e} L.} and Costa, {Pedro A.} and Gomes, {Ant{\'o}nio T.} and Marques, {Jos{\'e} C.} and Vieira, {Castorina S. }",

booktitle = "9th European Conference on Numerical Methods in Geotechnical Engineering",

note = "NUMGE 2018: 9th European Conference on Numerical Methods in Geotechnical Engineering, NUMGE 2018 ; Conference date: 25-06-2018 Through 27-06-2018",

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}

Kementzetzidis, E, Versteijlen, WG, Nernheim, A & Pisano, F 2018, 3D FE dynamic modelling of offshore wind turbines in sand: natural frequency evolution in the pre– to after-storm transition. in AS Cardoso, JL Borges, PA Costa, AT Gomes, JC Marques & CS Vieira (eds), 9th European Conference on Numerical Methods in Geotechnical Engineering. vol. 2, Porto, Portugal, pp. 1477-1484, NUMGE 2018: 9th European Conference on Numerical Methods in Geotechnical Engineering, Porto, Portugal, 25/06/18.

3D FE dynamic modelling of offshore wind turbines in sand: natural frequency evolution in the pre– to after-storm transition. / Kementzetzidis, E.; Versteijlen, Willem Geert; Nernheim, Axel et al.
9th European Conference on Numerical Methods in Geotechnical Engineering. ed. / António S. Cardoso; José L. Borges; Pedro A. Costa; António T. Gomes; José C. Marques; Castorina S. Vieira. Vol. 2 Porto, Portugal, 2018. p. 1477-1484.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - 3D FE dynamic modelling of offshore wind turbines in sand: natural frequency evolution in the pre– to after-storm transition

AU - Kementzetzidis, E.

AU - Versteijlen, Willem Geert

AU - Nernheim, Axel

AU - Pisano, Federico

N1 - Conference code: 9

PY - 2018/6/27

Y1 - 2018/6/27

N2 - 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.

AB - 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.

UR - http://resolver.tudelft.nl/uuid:be363010-02d9-4896-bab6-161e4e85f9ff

M3 - Conference contribution

SN - 9781138544468

VL - 2

SP - 1477

EP - 1484

BT - 9th European Conference on Numerical Methods in Geotechnical Engineering

A2 - Cardoso, António S.

A2 - Borges, José L.

A2 - Costa, Pedro A.

A2 - Gomes, António T.

A2 - Marques, José C.

A2 - Vieira, Castorina S.

CY - Porto, Portugal

T2 - NUMGE 2018: 9th European Conference on Numerical Methods in Geotechnical Engineering

Y2 - 25 June 2018 through 27 June 2018

ER -

Kementzetzidis E, Versteijlen WG, Nernheim A, Pisano F. 3D FE dynamic modelling of offshore wind turbines in sand: natural frequency evolution in the pre– to after-storm transition. In Cardoso AS, Borges JL, Costa PA, Gomes AT, Marques JC, Vieira CS, editors, 9th European Conference on Numerical Methods in Geotechnical Engineering. Vol. 2. Porto, Portugal. 2018. p. 1477-1484

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

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