Vibratory response of a wind tower considering soil-structure interaction

Resumo

This work presents a model of the vibratory response of a wind tower structure supported by an embed-
ded pile group, considering the soil-pile-structure interaction. The model for the pile group is obtained using the

impedance matrix method. The soil is considered as an isotropic, viscoelastic, three-dimensional half-space, the
response of which is obtained through a boundary element discretization of the pile-soil contact tractions. Piles
are modeled as one-dimensional finite beam elements. Coupling between the systems is achieved by establishing
equilibrium and continuity conditions at the soil-pile and pile-structure interfaces. The results consider arbitrary
harmonic loads applied to the structure in terms of nodal equivalents. This analysis show that disregarding the
influence of the pile group in the model of the tower may incur in considerable misrepresentation of the tower’s
dynamic response.