Monopiles for offshore wind turbines are subjected to large cyclic loads from the dynamic action of wind and waves on the structure. These cyclic loads may result in excessive accumulated deformation of the foundation beyond design tolerance criteria. To capture accumulated deformation, the Hyperplastic Accelerated Ratcheting Model (HARM) employs a ratcheting element. This modelling approach has been used for macro-element modelling of monopile foundations. This paper focuses on integrating HARM into a generalised Winkler foundation, such that it can be used as an extension of the PISA parameterised design method. This integrated method can be used in design for a more robust approach towards capturing the ratcheting behaviour of monopile foundations.
William J. A. P. Beuckelaers, Harvey J. Burd, Guy T. Houlsby, Ross A. McAdam and Byron W. Byrne
Keywords: monopile, Winkler, cyclic, ratcheting
Publisher: DFI