Steel jacket support structures for offshore wind have an increasing popularity for water depths larger than 20 m. Traditionally, support structures such as monopiles and gravity based foundation have dominated at shallow water. Offshore wind industry deals gradually with larger water depths, and light weight foundations as steel jackets are believed to give a cost benefit. The present study shows that the quasi static overturning moment for monotower structures and steel jackets are of comparable magnitude. It is also shown that the most important benefit of steel jackets as support structures is to reduce the base shear. At last it is shown that foundation size is primarily driven by wave and current loads at water depth around 50–60 m.

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