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http://dx.doi.org/10.9765/KSCOE.2016.28.4.222

Reliability Analysis of Offshore Wind Turbines Considering Soil-Pile Interaction and Scouring Effect  

Yi, Jin-Hak (Coastal Development Research Center, Korea Institute of Ocean Science and Technology)
Kim, Sun-Bin (Coastal Development Research Center, Korea Institute of Ocean Science and Technology)
Yoon, Gil-Lim (Coastal Development Research Center, Korea Institute of Ocean Science and Technology)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.28, no.4, 2016 , pp. 222-231 More about this Journal
Abstract
Multi-member lattice-type structures including jackets and tripods are being considered as good alternatives to monopile foundations for relatively deep water of 25-50 m of water depth owing to their technical and economic feasibility. In this study, the reliability analysis of bottom-fixed offshore wind turbines with monopile and/or multi-member lattice-type foundations is carried out and the sensitivities of random variables such as material properties, external wind loadings and scouring depth are compared with respect to different types of foundations. Numerical analysis of the NREL 5 MW wind turbine supported by monopile, tripod and jacket substructures shows that the uncertainties of soil properties affect the reliability index more significantly for the monopile-supported OWTs while the reliability index is not so sensitive to the material properties in the cases of tripod- and jacket-supported OWTs. In conclusion, the reliability analysis can be preliminarily carried out without considering soil-pile-interaction in the cases of tripod- and jacket-supported OWTs while it is very important to use the well-measured soil properties for reliable design of monopile-supported OWTs.
Keywords
offshore wind turbine; soil-pile interaction; reliability analysis; response surface method; monopile; tripod; jacket; scouring depth;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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