Recommendations for design of Offshore foundations exposed to ice loads
A recommendation for better estimations of ice loads on offshore wind powergenerators is presented together with informative sections on ice loadingmechanisms and statistics on ice conditions in Swedish seas. When thefoundations are designed horizontal and vertical loads from the ice sheet shallbe c...
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| Language: | unknown |
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2009
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| Online Access: | https://research.chalmers.se/en/publication/137498 |
| Summary: | A recommendation for better estimations of ice loads on offshore wind powergenerators is presented together with informative sections on ice loadingmechanisms and statistics on ice conditions in Swedish seas. When thefoundations are designed horizontal and vertical loads from the ice sheet shallbe calculated based on ice thickness, ice strength and properties of thestructure. It is then important to distinguish between ice conditions in thelandfast ice zone and the more dynamic ice situation further out from shore.As far as measured ice loads on vertical structures are available theprobabilistic effective ice pressure (load divided with ice thickness andfoundation width) shall serve as guidance. Ice loads against sloping or conicalstructures can be calculated using plasticity theory only if it is plausible thatthe ice fails by bending. That is not always the case in areas of pressureridges or compacted ice. Offshore wind power generators shall be checked foroscillating ice loads if its main frequency can be assumed to be close to thenatural frequency of the structure. This applies to both conical and verticalfoundations. |
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