Application of the suggested ice strength coefficients in ISO 19906 to intermittent crushing

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...

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

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,...

Classification Of Ice-Induced Vibration Regimes Of Offshore Wind Turbines

Ice-induced vibrations of offshore wind turbines on monopile foundations were investigated experimentally at the Aalto Ice Tank. A real-time hybrid test setup was developed allowing to accurately simulate the motion of a wind turbine in interaction with ice, incorporating the multi-modal aspects of the interaction and the effect of simultaneous...

Drifting with the Whales: Feasibility Analysis and Concept Design of a Drifting Ice Vessel for studying the behaviour of Bowhead Whales in North-East Greenland

The subject of this research is the concept design of a compact and economically feasible platform for studying the behaviour of bowhead whales in the ice-infested water around the coast of North-East Greenland and particularly in the Fram Strait.<br/><br/>The study is focused on the capabilities of the vessel to operate in a dynamic ice...

Global ice ridge ramming loads based on full scale data and specific energy approach

This thesis analyses the loads that occurred during an ice ridge ramming experiment with the icebreaker Oden. Sea ice ridges are formed due to breaking and deformation of the ice cover. Wind, current, thermal expansion and Coriolis forces induce compression and shear forces onto level ice which can break the ice into rubble. The blocks of ice...

Ice-induced vibrations and ice buckling

Ice-induced vibrations can occur when flexible, vertically-sided offshore structures are subject to level ice such that the failure mode of ice is predominantly crushing. When the ice is relatively thin, or when the width of the structure is much larger than the ice thickness, the ice tends to buckle and subsequently fail as soon as the...

Soil-foundation interaction for the Arctic S platform under ice loading

Drilling in the complex and rough conditions in the Arctic areas is challenging. The challenges include harsh environmental conditions, spill recovery, high operating cost, relatively high risk, limited choice of drilling units, international (environmental) laws/regulations etc. The existence of recoverable oil and gas resources have been known...

Feasibility of Offshore Wind Substructures in Arctic Environments

Environmental research and in-situ measurements have shown that most regions of the Baltic Sea harnesses a large wind energy potential. The Finnish government has outlined a policy to generate a rapid increase in the use and production of renewable wind energy. In order to achieve these goals, the need arises for the construction of full scale...

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