지반-파일 상호작용을 고려한 PS 콘크리트 해상풍력 구조물의 거동 해석

Behavior analysis of PS concrete offshore wind turbine structure considering soil-pile interaction

The concrete gravity base structure is not suitable for the weak soil due to heavy self weight. As an alternative, PS concrete offshore wind turbine structure supported with piles was suggested. For the analysis of structure, the environmental conditions of southwest coast in Korea and 5MW wind turbine were applied. The diffraction theory on the 3D finite element was used for wave pressure. To consider the effect of pile foundation on structure, finite element analysis was carried out with soil-pile interaction. In the result, the stresses and displacements of structure were acceptable with the criteria of offshore standard. And, piles had the enough pullout and bearing capacities to endure loads on piles. To evaluate the resonance behavior of the structure, the natural frequency analysis was implemented. As a result, the suggested structure has no resonance and has a stable dynamic characteristic. Thus, it is concluded that the suggested structure can be applied for weak soil, and it is expected to be the solution for offshore wind farm in Korea.