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Ice Loads for Wind-Power Foundations in the Gulf of Bothnia

Lennart Fransson ; Lars Bergdahl (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik)
20th International Conference on Port and Ocean Engineering under Arctic Conditions 2009, POAC 2009; Lulea; Sweden; 9 June 2009 through 12 June 2009 (03766756). Vol. June 9-12, 2009 (2009), p. 12-19.
[Konferensbidrag, refereegranskat]

Ice loads measured on lighthouses in the Gulf of Bothnia can serve as guidance for design of foundations for wind-power generators. At some locations in the sea these structures must withstand high pressure from solid land fast ice as well as from ridges or other compacted ice masses that are drifting. Recommendations for design of offshore foundations around the Swedish coastline have recently been written by the authors. For the purpose of design, effective pressure as well as compressive strength is assumed to be independent of ice thickness. All structures should be designed for dynamic ice loads that are dependent on the natural frequency of the structure and the ice drift velocity. Increased effective pressure has earlier been indicated for high speed ice crushing both in field studies and compression tests. The presented results from ice load measurements on lighthouse Norströmsgrund support the suspicion that also design ice loads should increase with drift speed. This rate effect and other uncertainties about the worst case scenario for ice-induced vibrations suggest a more conservative design of wind-power foundations inside the dynamic ice zone.



Denna post skapades 2009-05-20. Senast ändrad 2018-01-05.
CPL Pubid: 94298

 

Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik (2005-2017)

Ämnesområden

Samhällsbyggnadsteknik
Materialteknik

Chalmers infrastruktur