Print Email Facebook Twitter Application of the suggested ice strength coefficients in ISO 19906 to intermittent crushing Title Application of the suggested ice strength coefficients in ISO 19906 to intermittent crushing Author Hendrikse, H. (TU Delft Offshore Engineering) Owen, C.C. (TU Delft Offshore Engineering) Date 2023 Abstract For offshore wind turbines on monopile or jacket foundations without ice cones, one of the relevant design load cases is that of ice floes or level ice crushing against the structure resulting in ice-induced vibrations. In relation to that design load case, a relevant question is which ice strength coefficient to use in the crushing formula in ISO 19906 for determining design peak loads during intermittent crushing. Despite the guidelines in the standard being relatively clear on this matter, there often exists uncertainty regarding if and how to account for velocity effects and compliance effects when defining the ice strength coefficient CR. Ice tank tests were recently conducted to investigate the dependence of global peak loads on far-field ice speed for both rigid and compliant structures. Those tests revealed that the compliance effect and velocity effect on the global loads originate from the same strengthening effect in the ice. As a consequence, the absolute global loads on the rigid structure and compliant structure did not differ significantly. Applying these results to the challenge of defining the ice strength coefficient for intermittent crushing, it can be stated that if the velocity effect is accounted for in the ice strength coefficient, then there is no need for further increase due to compliance of the structure. ISO 19906 provides some suggested values for the ice strength coefficient which include provisions for the velocity effect and can therefore be directly applied to determine the peak loads during intermittent crushing, as the standard also suggests. Subject Crushing equationIce-induced vibrationsGlobal ice loadsCompliance effectVelocity effect To reference this document use: http://resolver.tudelft.nl/uuid:4d4936f3-6f4f-4b8c-b0a1-48c2d965183d Publisher POAC Source Proceedings of the 27th International Conference on Port and Ocean Engineering under Arctic Conditions Event POAC 2023, 2023-06-12 → 2023-06-14, University of Strathclyde, Technology & Inovation Centre, Glasgow, United Kingdom Series Proceedings - International Conference on Port and Ocean Engineering under Arctic Conditions, 0376-6756 Part of collection Institutional Repository Document type conference paper Rights © 2023 H. Hendrikse, C.C. Owen Files PDF Paper66_Hendrikse.pdf 1.27 MB Close viewer /islandora/object/uuid:4d4936f3-6f4f-4b8c-b0a1-48c2d965183d/datastream/OBJ/view