Publication Abstract

International Symposium on Frontiers in Offshore Geotechnics, (DFI)

Implementation of Advanced Monopile Design Approaches at the Seastar Offshore Wind Farm
M. Rattley, S. Whyte, J. Hilton, D. Burbury, H. J. Burd, C. M. Martin and S. Ingarfield

New geotechnical design methodologies are being utilised to develop site-specific soil reaction curves for the analysis of large diameter monopile foundations. Although there are numerous recent publications outlining new geotechnical design approaches for monopiles, there are few case studies outlining the practical application of such approaches in design. This paper presents a case study where site-specific PISA-type reaction curves were derived and applied for structural design of a monopile foundation for the Seastar offshore substation platform, Belgium Sector North Sea. The paper provides a description of the geotechnical and structural analyses performed, and addresses some challenges to implementation, including calibration of the numerical soil model, consideration of cyclic loading, and establishing a process for integrated design. Finite element analysis was performed using a multi-surface plasticity constitutive model to develop site-specific soil reaction curves. A dynamic structural analysis tool capable of capturing ringing effects, due to high order wave loading, and modelling diffraction effects including directionality, P-/spl Delta/ effects and linear buckling was used for the structural design analysis. Application of these analyses is shown to reduce foundation-related project risk when compared with standard codified approaches

 article #3603; publication #1069 (IC-ISFOG21)