floating offshore wind

floating wind

natural frequency

offshore wind turbines

vertical load

offshore floating

monopile foundation

wind turbine fowt

wind wave

offshore wind turbine

Soil Dynamics and Earthquake Engineering

This paper investigates the dynamic responses of offshore wind turbine (OWT) supported on monopile foundation in clay subjected to wind, wave and earthquake actions. Based on the open-source software platform OpenSees, a three-dimensional finite model of the system is developed. The tower and monopile is modeled using beam element, the pile-soil interface behavior using nonlinear Winkler foundation approach, and the pile-water interface using hydrodynamic added mass. The wind, wave and earthquake actions are applied as loadings on the system. The effects of several parameters, such as wind velocity, induction factor, wave period, peak ground acceleration, and soil parameters on the dynamic responses of the system are studied. The results indicate that it is necessary to consider the combination of wind, wave and earthquake actions in the design of offshore wind turbine.

Wind, wave and earthquake responses of offshore wind turbine on monopile foundation in clay