Desing and structural verification a concrete spar type platform for a 15 Mw wind turbine

Taking into account the increasing of the demand of renewable energy, one of the solutions which help to cover this demand is the off-shore technology. This is precisely, the object of this thesis, the structural verification and analysis of a floating off-shore wind turbine platform type spar, supporting a 15 MW wind turbine. It will be used the software OpenFAST to compute motions, stresses and moments of the structure, and then, taking into account that the structure of the spar is made with concrete, it will be defined the post-tensioning steel and the passive steel, according to the Spanish standard for concrete structures EHE-08. It will be also made the structural analysis during the construction process, when the spar is placed in horizontal position. This will be necessary taking into account the huge dimensions of the structure