Fatigue Strength Of Fixed Offshore Structures Under Variable Amplitude Loading Due To Wind, Wave, And Ice Action

Conference paper (2022)

Authors

Moritz Braun Hamburg University of Technology
Alfons Dörner Hamburg University of Technology
Tom Willems Siemens Gamesa Renewable Energy
Marc Seidel Siemens Gamesa Renewable Energy
H. Hendrikse Offshore Engineering - CEG
Knut V. Høyland Norwegian University of Science and Technology (NTNU)
Claas Fischer TÜV NORD EnSys Hannover GmbH & Co. KG
Sören Ehlers Deutsches Zentrum für Luft- und Raumfahrt (DLR)
Research Group
Offshore Engineering (CEG) (TU Delft)
Copyright: © 2022 Moritz Braun, Alfons Dörner, Tom Willems, Marc Seidel, H. Hendrikse, Knut V. Høyland, Claas Fischer, Sören Ehlers
DOI: https://doi.org/10.1115/OMAE2022-78764
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Published Date

2022

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Offshore Engineering

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.

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