Seismic Analysis of Concrete Conical Foundation for 5 MWWind Turbine

Recently offshore wind turbines have been constructed and planned in Korea. However, seismic stability was not extensively examined, although relatively small earthquakes frequently occur and the occurrence trend is increasing. This study intends to analyze the seismic stability of a wind turbine foundation based on KPMDC, KBDC, and DNV OS. The foundation considered has a conical concrete base under a steel shaft supporting the 5 MW wind turbine. This study performed 3D response spectrum analysis to consider turbine weight and self-weights. Analysis resultsbased on KPMDC indicatedthat very severetensile stresses in the concrete foundation near the neck bracket and pile-concrete foundation connection, which may require reinforcing.