This paper presents an engineering approach to study the effects of soil profile variation and scour on structural response of an offshore monopile wind turbine. A wind-wave model for finite water depth is proposed to obtain the corresponding sea-state based on the incident wind. Different wind, wave, and current loads on the wind turbine for the operational conditions are considered. The interaction between the foundation and the soil is simulated by nonlinear springs, for which stiffness properties are obtained from the axial load transfer curve, the tip load–displacement curve, and the lateral load–deflection curve. Four types of soil conditions are considered, i.e., 100% sand layer, 50% sand layer (top) and 50% clay layer (bottom), 50% clay layer (top), and 50% sand layer (bottom), as well as 100% clay layer. For a given current speed, the variations of the structural response of the wind turbine due to the effects of different wind–wave load combinations, soil conditions and scour have been investigated. Different wind–wave load combinations directly affect the mean internal bending moment and mean displacement vertically along the support structure. Different soil conditions change the eigenfrequency of the structure significantly. The top layer of the soil appears to have a strong influence on the mean internal bending moment and the mean shear force distribution along the foundation. Moreover, the effect of scour alters the eigenfrequency of the structure significantly. The maximum mean bending moment and displacement increase for the cases with a scour hole as compared to the cases with scour protection.
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August 2018
Research-Article
Effects of Soil Profile Variation and Scour on Structural Response of an Offshore Monopile Wind Turbine
Hui Li,
Hui Li
College of Shipbuilding Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: huili@hrbeu.edu.cn
Harbin Engineering University,
Harbin 150001, China
e-mail: huili@hrbeu.edu.cn
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Muk Chen Ong,
Muk Chen Ong
Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
Engineering and Materials Science,
University of Stavanger,
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
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Bernt Johan Leira,
Bernt Johan Leira
Department of Marine Technology,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: bernt.leira@ntnu.no
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: bernt.leira@ntnu.no
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Dag Myrhaug
Dag Myrhaug
Department of Marine Technology,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: dag.myrhaug@ntnu.no
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: dag.myrhaug@ntnu.no
Search for other works by this author on:
Hui Li
College of Shipbuilding Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: huili@hrbeu.edu.cn
Harbin Engineering University,
Harbin 150001, China
e-mail: huili@hrbeu.edu.cn
Muk Chen Ong
Department of Mechanical and Structural
Engineering and Materials Science,
University of Stavanger,
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
Engineering and Materials Science,
University of Stavanger,
Stavanger 4036, Norway
e-mail: muk.c.ong@uis.no
Bernt Johan Leira
Department of Marine Technology,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: bernt.leira@ntnu.no
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: bernt.leira@ntnu.no
Dag Myrhaug
Department of Marine Technology,
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: dag.myrhaug@ntnu.no
Norwegian University of Science
and Technology,
Trondheim 7491, Norway
e-mail: dag.myrhaug@ntnu.no
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received August 23, 2016; final manuscript received February 7, 2018; published online March 14, 2018. Assoc. Editor: Lizhong Wang.
J. Offshore Mech. Arct. Eng. Aug 2018, 140(4): 042001 (10 pages)
Published Online: March 14, 2018
Article history
Received:
August 23, 2016
Revised:
February 7, 2018
Citation
Li, H., Ong, M. C., Leira, B. J., and Myrhaug, D. (March 14, 2018). "Effects of Soil Profile Variation and Scour on Structural Response of an Offshore Monopile Wind Turbine." ASME. J. Offshore Mech. Arct. Eng. August 2018; 140(4): 042001. https://doi.org/10.1115/1.4039297
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