Sammendrag
Offshore wind in the Asia-Pacific region is quickly gaining momentum, with the installed
capacity expected to significantly increase in the near future. At variance with offshore wind
turbines in the North Sea, those installed in the Asia-Pacific region are prevalently exposed to
typhoons. This results in severe wind speeds and, consequently, extreme waves. Such
conditions become driving for the design of the support structures. This paper explores the
impact of using a non-linear hysteretic foundation model on the dynamic response of an
offshore wind turbine. First, the adopted non-linear macro-element model is verified for the
extreme load levels that occur in the Asia-Pacific region. Further analyses, that evaluate the
hysteretic foundation damping, indicate that the frequently used logarithmic decrement
method may not be a valid damping estimation method for an offshore wind turbine. Compared
to non-linear elastic foundation models calibrated against API p-y functions, the macroelement
model calibrated against 3D finite element analyses gives a reduction of the
magnitude of the response along the height of the support structure.
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