Dynamic Responses of Offshore Wind Turbines on Bucket Foundations in Sand Considering Soil-Structure Interaction

摘要

A computationally efficient model including the dynamic wind turbine-bucket-soil interaction is proposed. In this model, Euler-Bernoulli beam theory is used to depict the tower of the turbine, bucket foundation is modeled as a rigid shell due to its small length to radius ratio; while the seabed is modeled as an elastic soil half-space. Analytical frequency dependent dynamic impedance functions will be used to model the effect of dynamic soil-structure interaction. The natural frequencies and dynamic responses of the whole system at various loading conditions will be studied. The impedance matrix model is validated by comparing with a coupled finite-infinite element model.