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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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Discussion papers
https://doi.org/10.5194/wes-2019-57
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2019-57
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 03 Sep 2019

Submitted as: research article | 03 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Wind Energy Science (WES).

Reliability analysis of offshore wind turbine foundations under lateral cyclic loading

Gianluca Zorzi1, Amol Mankar2, Joey Velarde3, John D. Sørensen2, Patrick Arnold1, and Fabian Kirsch1 Gianluca Zorzi et al.
  • 1GuD Geotechnik und Dynamik Consult GmbH, Berlin, 10589, Germany
  • 2Aalborg University, Aalborg, 9100, Denmark
  • 3COWI A/S, Aarhus, 8000, Denmark

Abstract. The design of foundations for offshore wind turbines (OWT) requires the assessment of the long-term performance of the soil–structure-interaction (SSI) which is subjected to a large number of cyclic loadings. In terms of serviceability limit state (SLS), it has to be ensured that the foundation does not exceed the operational tolerance prescribed by the wind turbine manufacturer throughout its lifetime. This work aims at developing a probabilistic approach along with a reliability framework with emphasis on verifying the SLS criteria in terms of maximum allowable rotation during an extreme cyclic loading event. This reliability framework allows the quantification of uncertainties in soil properties, in the constitutive soil model for cyclic loadings and extreme environmental conditions and verifies that the foundation design meets a specific target reliability level. A 3D finite element (FE) model is used to predict the long-term response of the SSI accounting for the accumulation of permanent cyclic strain experienced by the soil. The proposed framework is employed for the design of a large diameter monopile supporting a 10 MW offshore wind turbine.

Gianluca Zorzi et al.
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Gianluca Zorzi et al.
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Short summary
Storms, typhoons or seismic actions are likely to cause permanent rotation of offshore wind turbine foundations. An excessive rotation jeopardizes the operation of the wind turbine. In this study geotechnical, loads and probalistic modelling are used to develop a reliability framework for predicting the rotation of the foundation under cyclic lateral loading.
Storms, typhoons or seismic actions are likely to cause permanent rotation of offshore wind...
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