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김범준,Pasin Plodpradit,수타수프라딧 송삭,김현기,김기두 한국풍력에너지학회 2017 풍력에너지저널 Vol.8 No.2
A concrete offshore wind turbine structure supported with suction pile for a weak soil foundation wasproposed, and ship collision analysis was carried out to evaluate the concrete structure with a ship impact load. To take into account the effect of suction pile and soil on the structure, a lumped parameter model was usedto calculate the soil stiffness matrix. As the first step, a linear analysis of the structure was carried out for afeasibility assessment of the designed structure. A 5 MW wind turbine and the environmental conditions of thesouthwest coast of Korea were applied. In a quasi-static analysis, maximum displacements and stresses did notexceed the allowable values from the offshore standard, and it was determined that no resonance occurred ina natural frequency analysis. For the ship collision evaluation, a nonlinear dynamic algorithm of ship collisionwas performed using a nonlinear concrete material model. A ship impact–load time history curve was applied,and maximum displacement and principal stresses were calculated. The principal stresses were not exceeded inthe range of the concrete strength. Thus, damage to the concrete structure by ship collision was small, and ithas enough stability to be applied on the southwest coast of Korea. Consequently, it is expected that theproposed structure can be a good solution for offshore wind farms.
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