Journal of the Korean GEO-environmental Society (한국지반환경공학회 논문집)

Korean Geo-Environmental Society (한국지반환경공학회)
권호 표지
DOI QR코드

DOI QR Code

Evaluation of Horizontal Load and Moment Capacities of Bucket-Type Offshore Wind Turbine Foundation

버켓형식 해상풍력기초의 수평 하중과 모멘트 저항력 평가

  • Bagheri, Pouyan (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Yoon, Jong Chan (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Son, Su Won (Seismic Simulation Test Center, Pusan National University) ;
  • Kim, Jin Man (Department of Civil and Environmental Engineering, Pusan National University)
  • Received : 2020.11.04
  • Accepted : 2020.12.31
  • Published : 2021.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

Owing to economically efficient and easy installation, bucket foundation is a promising solution for offshore wind turbines. This paper aims at finding the behavior of suction caissons and soil surrounding the foundation by using three-dimensional finite element analysis. Under various loading conditions, a wide range of foundation geometries installed in dense and medium dense sandy soil was considered to evaluate ultimate horizontal load and overturning moment capacity. The results show that the rotation and displacement of the bucket due to monotonic loading are largely dependent on the foundation geometry, soil density and load eccentricity. Normalized diagrams and equations for the ultimate horizontal load and overturning moment capacities are presented that are useful tool for the preliminary design of such foundation type.

경제적으로 효율적이고 설치가 용이한 버켓기초는 해상풍력발전기초로 적용함에 있어 좋은 방법이 될 수 있다. 이에 본 논문에서는 3차원 유한요소해석을 통해 버킷기초 적용시 기초 주위의 석션케이슨과 지반의 거동을 파악하여 분석하고자 한다. 다양한 하중조건에서 조밀한 사질토 지반과 중간 밀도의 사질토지반에 설치된 기초의 구조를 검토하고 이를 바탕으로 사질토 지반에 설치된 버켓기초의 극한하중 허용량과 회전 모멘트 허용량을 평가하였다. 그 결과, 단일하중에 의한 버켓기초의 회전과 변위는 기초의 구조적 형상, 지반 밀도, 하중편심에 크게 영향을 받는다는 것을 확인할 수 있었다. 이러한 극한 수평하중과 회전 모멘트 허용량의 결과를 바탕으로 정규화 도표와 제안식을 제안하였고, 이는 향후 해상풍력발전기초의 설계 시 유용하게 사용될 것으로 판단된다.

Keywords

References

  1. Byrne, B. W. (2000), Investigations of suction caissons in dense sand, Ph.D Dissertation, University of Oxford.
  2. Byrne, B. W. and Houlsby, G. T. (2004), Experimental investigations of the response of suction caissons to transient combined loading, Journal of Geotechnical and Geoenvironmenal Engineering, Vol. 130, No. 3, pp. 240-253. https://doi.org/10.1061/(ASCE)1090-0241(2004)130:3(240)
  3. Brinkgreve, R. B. J., Engin, E. and Swolfs, W. M. (2012), Manual for PLAXIS 3D (2012).
  4. Den Norske Veritas (1992), Foundation, No. 30.4, pp. 1-54.
  5. Houlsby, G. T., Ibsen, L. B. and Byrne, B. W. (2005), Suction Caissons for wind turbines, Proceedings of the 1st International Symposium on Frontiers in Offshore Geotechnics (ISFOG), Perth Australia, pp. 75-94.
  6. Ibsen, L. B. (2002), Bilag til Bottefundament Frederikshavn Havn. (Enclosure for Bucket Foundation Habour of Frederikshavn; In Danish) Internal Report R0206 ISSN 13986465 R0206 Aalborg University (Confidential).
  7. Jeon, H. W., Son, S. W. and Kim, J. M. (2013), Study of dynamic characteristics of west coast Saemangeum sand by torsional shear test Jounal of Ocean Engineering and Technology, Vol. 27, No. 96, pp. 73-80 (In Korean). https://doi.org/10.5574/KSOE.2013.27.6.073
  8. Kelly, R. B., Houlsby, G. T. and Byrne, B. W. (2006), A comparison of field and laboratory caisson tests in sand and clay, Geotechnique, Vol. 56, No. 9, pp. 617-626.
  9. Ryu, T. G. (2015), Long-term dynamic behavior study of marine silty sand for offshore structure foundation design, Master thesis, Pusan National University, pp. 1-99 (In Korean).
  10. Zhu, B., Kong, D., Chen, R., Kong, L. and Chen, Y. (2011), Installation and lateral loading rests of suction caissons in silt, Canadian Geotechnical Journal, Vol. 48, No. 7, pp. 1070-1084. https://doi.org/10.1139/t11-021