Abstract
Abstract Offshore wind turbines are complex systems which are subjected to complicated loads and load effects. This will demand comprehensive numerical modelling of the structure for both loads and resistance. Design by direct analysis and first principles of hydrodynamic and aerodynamic loads and their effects on offshore wind turbine structure are hence preferred to limit the uncertainty in modelling and prediction. Therefore, it is important to account for the uncertainties in load effect (responses) and resistance modelling in relation to the current design value. This paper deals with the monopile-supported offshore wind turbine ultimate limit state design format. The effect of model uncertainty in loads and resistance on the safety level are studied. Differences in safety levels due to such uncertainties show that the implied safety level is not properly harmonized. Impact of bias and random uncertainty in calculation of wind and wave nonlinearities and the correlation between nonlinear prediction and statistical predictions of both wave and wind loads on the implied safety level should carefully be accounted for.
Published Version
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