Title
Fatigue Strength Of Fixed Offshore Structures Under Variable Amplitude Loading Due To Wind, Wave, And Ice Action
Author
Braun, Moritz (Hamburg University of Technology)
Dörner, Alfons (Hamburg University of Technology)
Willems, Tom (Siemens Gamesa Renewable Energy)
Seidel, Marc (Siemens Gamesa Renewable Energy)
Hendrikse, H. (TU Delft Offshore Engineering) 
Høyland, Knut V. (Norwegian University of Science and Technology (NTNU))
Fischer, Claas (TÜV NORD EnSys Hannover GmbH & Co. KG)
Ehlers, Sören (DLR Institute for Maritime Energy Systems)
Date
2022
Abstract
Fixed offshore wind turbines are increasingly developed for high latitude areas where not only wind and wave loads need to be considered, but also moving sea ice. Current structural design rules do not adequately consider the effect of ice loading on fatigue life, due to missing studies on fatigue strength of welded joints under combined wind, wave, and ice action. Thus, a methodology to determine combined variable-amplitude loading (VAL) spectra was developed in a previous study. The stress state time-history at an exemplarily selected point in the support structure of an offshore wind energy monopile was translated into a VAL sequence. This sequence is used as an input for fatigue tests of butt-welded joints in the current study. The current study presents the VAL spectrum and the corresponding VAL time series, the results of the fatigue tests and compares them to typical fatigue damage sums for other stress spectra.
Subject
Arctic technology
ice loads
stress analysis
offshore renewable energies
wind turbine fatigue damage and life extension
structural integrity
To reference this document use:
http://resolver.tudelft.nl/uuid:6db3e365-280e-4bd9-88e4-60217d4e5c5a
DOI
https://doi.org/10.1115/OMAE2022-78764
Publisher
The American Society of Mechanical Engineers (ASME), Hamburg, Germany
Embargo date
2023-04-13
ISBN
978-0-7918-8591-8
Source
Polar and Arctic Sciences and Technology
Event
ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2022, 2022-06-05 → 2022-06-10, Congress Center Hamburg, Hamburg, Germany
Series
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE, 6
Bibliographical note
Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.
Part of collection
Institutional Repository
Document type
conference paper
Rights
© 2022 Moritz Braun, Alfons Dörner, Tom Willems, Marc Seidel, H. Hendrikse, Knut V. Høyland, Claas Fischer, Sören Ehlers