Print Email Facebook Twitter Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading Title Development of Combined Load Spectra for Offshore Structures Subjected to Wind, Wave, and Ice Loading Author Braun, Moritz (Hamburg University of Technology) Dörner, Alfons (Hamburg University of Technology) ter Veer, Kane F. (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 (Hamburg University of Technology) Date 2022 Abstract Fixed offshore wind turbines continue to be developed for high latitude areas where not only wind and wave loads need to be considered but also moving sea ice. Current rules and regulations for the design of fixed offshore structures in ice-covered waters do not adequately consider the effects of ice loading and its stochastic nature on the fatigue life of the structure. Ice crushing on such structures results in ice-induced vibrations, which can be represented by loading the structure using a variable-amplitude loading (VAL) sequence. Typical offshore load spectra are developed for wave and wind loading. Thus, a combined VAL spectrum is developed for wind, wave, and ice action. To this goal, numerical models are used to simulate the dynamic ice-, wind-, and wave-structure interaction. The stress time-history at an exemplarily selected critical point in an offshore wind energy monopile support structure is extracted from the model and translated into a VAL sequence, which can then be used as a loading sequence for the fatigue assessment or fatigue testing of welded joints of offshore wind turbine support structures. This study presents the approach to determine combined load spectra and standardized time series for wind, wave, and ice action. Subject Arctic conditionsDamage modelIce-induced vibrationsLow-temperature fatigueMarkov chain methodOffshore wind turbine support structuresOmission levelRainflow countingStress-time sequence To reference this document use: http://resolver.tudelft.nl/uuid:d7db9a64-64c4-4476-8776-608720c9e0fb DOI https://doi.org/10.3390/en15020559 ISSN 1996-1073 Source Energies, 15 (2), 1-17 Part of collection Institutional Repository Document type journal article Rights © 2022 Moritz Braun, Alfons Dörner, Kane F. ter Veer, Tom Willems, Marc Seidel, H. Hendrikse, Knut V. Høyland, Claas Fischer, Sören Ehlers Files PDF energies_15_00559_v2.pdf 3.76 MB Close viewer /islandora/object/uuid:d7db9a64-64c4-4476-8776-608720c9e0fb/datastream/OBJ/view