Add to ORKGThe aim was to investigate the impact of combined wind and wave loading on machine loads and dynamic response of offshore wind turbines. The report describes the development of analytical tools for modelling the dynamic loading of offshore wind turbines. These tools were extensions of established Garrad Hassan computer programs for modelling onshore wind turbines and employed both time domain and frequency domain techniques. These extensions involved developing a sophisticated treatment of the support structure dynamics and its interface with a wave loading module. Illustrative calculations and sensitivity studies were performed using the new tools for three different wind turbines at two different sites. (orig./RHM)SIGLEAvailable from TIB ...