EXPERIMENTAL STUDY ON WAVE RESISTANCE PERFORMANCE OF MONOPILE TYPE FOUNDATION OF OFFSHORE WIND TURBINE WITH UNDERWATER SESMIC CONTROL PANEL

Abstract

 As wind turbines become larger, monopiles(MPs), which are the main type of foundation for offshore wind farms, tend to become larger, especially in Japan, due to the increase in seismic load, which poses a challenge to their construction by SEP vessels. A structure to reduce the seismic sectional force of the MP foundation is proposed, in which a cylindrical underwater seismic control panel("seismic control panel") covering the MP is partially submerged in the water. However, compared to the existing MP, the location where the seismic isolation plate is installed may increase wave action due to the increased outer diameter, making it necessary to study the effect of waves. In this study, the wave resistance of MP foundations with seismic control panel was examined by comparing the bending strain at the base of MP foundations based on hydraulic model experiments and dynamic analysis.As a result, it was confirmed that the MP with seismic control panel has no adverse effect on wave resistance except for the effect of increased outer diameter, which is usually assumed in the foundation design.