3D and 1D modelling of monitored monopiles located in the Belgian North Sea
3D and 1D modelling of monitored monopiles located in the Belgian North Sea
Offshore Wind Turbines (OWTs) located in the Belgian North Sea have been monitored for several years using different monitoring setups (accelerometers, strain gauges and Fiber Bragg Gratings). The monitoring data reveals that OWTs do not perform as expected, as they were designed using recommendations that were not adapted for large diam- eter and longer piles such as the API/DNV p-y methods. These design methodologies were extensively used due to their low numerical cost when compared to 3D- Finite Element (FE) simulations. Both 3D and 1D FE analyses of a laterally loaded monopile are carried in this paper. First, a 3D site-specific model of a monitored OWT is developed. The model consists of a monopile and the soil medium which is simulated using calibrated hypoplastic models. The monopile model is then sub- jected to representative lateral loadings then bending moments are extracted. Similar analyses are done using 1D rule-based PISA models and API/DNV models. Numerical results of a comparative study between the 3D-FE, 1D-PISA, 1D-API/DNV and the monitoring data are presented and discussed.
Anis Kheffache; B. Stuyts; C. Jurado; W. Weitjens; Christof Devriendt
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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