초록

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.

키워드

지반-파일 상호작용, 거동 해석, 프리스트레스트 콘크리트 해상풍력발전 구조물

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