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J. Mar. Sci. Eng. 2018, 6(3), 87; https://doi.org/10.3390/jmse6030087

Model Uncertainties for Soil-Structure Interaction in Offshore Wind Turbine Monopile Foundations

1
Department of Engineering, Aarhus University, 8000 Aarhus, Denmark
2
Department of Civil Engineering, Aalborg University, 9100 Aalborg, Denmark
3
Department of Civil, Architectural and Environmental Engineering, The University of Texas at Austin, Austin, TX 78712, USA
*
Author to whom correspondence should be addressed.
Received: 25 April 2018 / Revised: 9 July 2018 / Accepted: 9 July 2018 / Published: 18 July 2018
(This article belongs to the Special Issue Offshore Wind Structures)
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Abstract

Monopiles are the most common type of foundation used for bottom-fixed offshore wind turbines. This investigation concerns the influence of uncertainty related to soil–structure interaction models used to represent monopile–soil systems. The system response is studied for a severe sea state. Three wave-load cases are considered: (i) irregular waves assuming linearity; (ii) highly nonlinear waves that are merged into the irregular wave train; (iii) slamming loads that are included for the nonlinear waves. The extreme response and Fourier amplitude spectra for external moments and mudline bending moments are compared for these load cases where a simpler static pile-cap stiffness and a lumped-parameter model (LPM) are both considered. The fundamental frequency response of the system is well represented by the static pile-cap stiffness model; however, the influence of higher modes (i.e., the second and third modes with frequencies of about 1 Hz and 2 Hz, respectively) is significantly overestimated with the static model compared to the LPM. In the analyzed case, the differences in the higher modes are especially pronounced when slamming loads are not present. View Full-Text
Keywords: offshore wind turbines; monopiles; soil-structure interaction; lumped-parameter models; wave loading; slamming offshore wind turbines; monopiles; soil-structure interaction; lumped-parameter models; wave loading; slamming
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Andersen, L.V.; Andersen, T.L.; Manuel, L. Model Uncertainties for Soil-Structure Interaction in Offshore Wind Turbine Monopile Foundations. J. Mar. Sci. Eng. 2018, 6, 87.

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