Fatigue damage from dynamic ice action - The FATICE project

Fatigue damage from dynamic ice action - The FATICE project

Høyland, Knut V. (Norwegian University of Science and Technology (NTNU))
Nord, Torodd Skjerve (Norwegian University of Science and Technology (NTNU))
Turner, Joshua (Norwegian University of Science and Technology (NTNU); Memorial University of Newfoundland)
Hornnes, Vegard (Norwegian University of Science and Technology (NTNU))
Gedikli, Ersegun Deniz (Norwegian University of Science and Technology (NTNU))
Bjerkås, Morten (DIMB Consult AS)
Hendrikse, H. (TU Delft Offshore Engineering)
Hammer, T.C. (TU Delft Offshore Engineering; Siemens Gamesa)
Ziemer, Gesa (HSVA)

2021

In the FATICE project we have addressed the fatigue damage on fixed offshore structures exposed to drifting ice. This is an important challenge in the development of energy production from offshore wind in the Baltic and involves at least five element: a) define ice statistics, b) predict the structural response (ice-structure interaction simulations), c) estimate the fatigue damage and d) carry out scale-model tests. We have used the Copernicus database and simple analytical equations to define the large-scale ice statistics and studied down-scaling to structural scale by comparing with ice load data on the Norströmsgrund lighthouse (LOLEIF and STRICE data). The VANILLA model allows for ice-structure interaction simulations and has been validated against the full-scale LOLEIF and STRICE data and against the model-scale ice in HSVA. The fully coupled and the traditional methods are compared. In the fatigue estimations studies the assumption of linear damage accumulation is challenged and load combinations from wave, wind and ice studied by assessing simulated time-series of the different loads. The main results is that sea ice cause the higher loads than wind and waves do , but the cumulative frequency of ice loads is much smaller than for wind and waves. The traditional model-scale ice tends to be too soft and/or too viscous so that a realistic breaking pattern combined with realistic force-time series is not been obtained for large aspect ratios. HVA has developed a crushing model ice (ICMI) in which the ice crystals are larger and the texture more uniform.

Offshore structures
Fatigue damage
Dynamic ice action

http://resolver.tudelft.nl/uuid:12b96e83-e3b6-4f3f-9793-566ac37f6e9c

Proceedings of the 26th International Conference on Port and Ocean Engineering under Arctic Conditions: June 14-18, 2021, Moscow, Russia

Proceedings of the International Conference on Port and Ocean Engineering under Arctic Conditions, 2077-7841

Institutional Repository

conference paper

© 2021 Knut V. Høyland, Torodd Skjerve Nord, Joshua Turner, Vegard Hornnes, Ersegun Deniz Gedikli, Morten Bjerkås, H. Hendrikse, T.C. Hammer, Gesa Ziemer