고정식 해상풍력터빈에 대한 지반-말뚝 상호작용 및 세굴깊이를 고려한 신뢰성 해석

Title
고정식 해상풍력터빈에 대한 지반-말뚝 상호작용 및 세굴깊이를 고려한 신뢰성 해석
Alternative Title
Reliability analysis of bottom-fixed offshore wind turbines considering soil-pile-interaction and scouring depth
Author(s)
이진학; 김선빈; 윤길림
KIOST Author(s)
Yi, Jin Hak(이진학)Yoon, Gil Lim(윤길림)
Publication Year
2016-09-07
Abstract
Currently, multi-member lattice-type structures including jackets and tripods are being considered as one of good alternatives to monopile foundations for relatively deep water in the range 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. Response surface method is incorporated to handle the implicit type of failure function for applying the first-order reliability method (FORM). From the nu-merical analysis of the NREL 5 MW wind turbine supported by monopile, tripod and jacket substructures, it is found 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 the consideration on soil-pile-interaction in the cases of tripod- and jacket-supported OWTs when the soil properties are not fully known while it is very important to use the well-measured soil properties for reliable design of monopile-supporte 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. Response surface method is incorporated to handle the implicit type of failure function for applying the first-order reliability method (FORM). From the nu-merical analysis of the NREL 5 MW wind turbine supported by monopile, tripod and jacket substructures, it is found 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 the consideration on soil-pile-interaction in the cases of tripod- and jacket-supported OWTs when the soil properties are not fully known while it is very important to use the well-measured soil properties for reliable design of monopile-supporte
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/24611
Bibliographic Citation
The Sixth International Conference on Structural Engineering, Mechanics and Computation, pp.948 - 952, 2016
Publisher
CRC Press
Type
Conference
Language
English
Publisher
CRC Press
Related Researcher
Research Interests

Ocean Energy-Tidal Current Energy Converter System,Infrastructure Management-Structural Health Monitoring,Offshore Wind,해양에너지-조류발전시스템,시설물 유지관리-구조건전성 평가,해상풍력

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