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Energies 2017, 10(8), 1190; https://doi.org/10.3390/en10081190

An Investigation into the Effect of Scour on the Loading and Deformation Responses of Monopile Foundations

1
Department of Civil Engineering, National Cheng Kung University, Tainan 701, Taiwan
2
Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan 701, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Lance Manuel
Received: 10 June 2017 / Revised: 3 August 2017 / Accepted: 4 August 2017 / Published: 11 August 2017
(This article belongs to the Special Issue Wind Turbine Loads and Wind Plant Performance)
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Abstract

Severe foundation scour may occur around monopile foundations of offshore wind turbines due to currents and waves. The so-called p-y curves method is suggested in the existing design recommendations to determine the behavior of monopiles unprotected against scour and the reduction of effective soil stress is accounted for by the extreme scour depth. This conservative design approach does not consider the geometry of the scour hole and the effect of pile diameter on the soil resistance. An underestimated foundation stiffness would be obtained, thereby influencing the predicted overall response of the support structure of an offshore wind turbine. In this study, we calculated the load-deformation response and foundation stiffness of a monopile when scour occurred. The influence of pile diameter on the initial modulus of subgrade reaction, and the modification of the ultimate soil resistance of a monopile subject to scour are evaluated. The commercial software BLADED was used to simulate the dynamic response of the reference offshore wind turbine with monopile unprotected against scour at Chang-Bin offshore wind farm in Taiwan Strait. The results showed that when the p-y curve suggested by existing design regulation was used to calculate the load-deformation response, the foundation stiffness was underestimated where the scour depth was greater than the pile diameter, but the foundation stiffness was overestimated when the scour depth was less than the pile diameter. View Full-Text
Keywords: offshore wind farm; monopole; scour; foundation stiffness; pile head deformation offshore wind farm; monopole; scour; foundation stiffness; pile head deformation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Tseng, W.-C.; Kuo, Y.-S.; Chen, J.-W. An Investigation into the Effect of Scour on the Loading and Deformation Responses of Monopile Foundations. Energies 2017, 10, 1190.

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