Structural Safety and Design Requirements of CFMP based Offshore Wind Substructure System

wind substructure system should have a structural safety against to the harsh offshore conditions of wind, wave, and tidal. Also, in order to satisfy overturning stability, gravity based substructure system should be required to have sufficient foundation resistance and weighting resistance to efficiently resist to the overturning. In this study, structural safety for the CFMP based offshore wind substructure system was evaluated. CFMP based substructure system of this study was designed to improve structural safety against to the harsh offshore condition and to reduce constructional cost. In order to investigate ultimate structural safety and serviceability, integrated static structural analysis was carried out and structural behaviors of the strength and deformation were evaluated. Also, in order to investigate dynamic modal safety, modal analysis was carried out and natural frequency and resonance possibility were evaluated. As the results of this study, it was found that the CFMP based offshore wind substructure system of this study satisfied structural safeties in respect of ULS (ultimate limit state) and SLS (serviceability limit state). Also, this system satisfied vibration safety, namely resonance was not occurred. However, if the total weight and stiffness of substructure system increased, it was respected that vibration safety should be improved.