This thesis presents a dynamic analysis of a three-blade wind turbine with tubular cross section under deterministic and stochastic concentrated and distributed loads including those caused by wind and by sea currents. Variations in soil conditions are allowed, being modeled as linear axial and torsional springs installed at the base of the tower. The random loading is due to the action of the wind on the turbine blades. The symmetries involved allow the tower to be modeled as having four separated and superimposed structural behaviors: a beaming spatial (lateral motion), a shaft (torsional) motion and a bar (axial) motion. Finite elements are used for approximating the dynamic of the tower and then a reduced model is constructed using a basis of finite dimension of the structure eigenvectors. The other turbine components, namely, the nacelle, the shaft and the blades are modeled as rigid bodies whose links are imposed by constraints functions. An algorithm based on Newmark method was developed to integrate the system of equations in time. Velocities, accelerations, forces and torques as well as the resulting stresses are obtained for several configurations.