DOI QR코드

DOI QR Code

Experimental study on wave forces to offshore support structures

  • Jeong, Youn-Ju (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Min-Su (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) ;
  • You, Young-Jun (Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
  • Received : 2016.03.19
  • Accepted : 2016.06.16
  • Published : 2016.10.25

Abstract

In this study, wave force tests were carried out for the four types of offshore support structures with scale factor 1:25 and wave forces to the support structure shapes were investigated. As the results of this study, it was found that, as the wave period increased at the normal wave condition, wave force decreased for the most cases. Extreme wave force was affected by the impact wave force. Impact wave force of this study significantly effect on Monopile and slightly on GBS and Hybrid type. Accordingly, Hybrid type indicated even lower wave force at the extreme and irregular wave conditions than the Monopile although Hybrid type indicated higher wave force at the normal wave condition of the regular wave because of the larger wave area of wave body. In respects of the structural design, since critical loading is extreme wave force, it should be contributed to improve structural safety of offshore support structure. However, since the impact wave force has nonlinearity and complication dependent on the support structure shape, wave height, wave period, and etc., more research is needed to access the impact wave force for other support structure shapes and wave conditions.

Keywords

Acknowledgement

Supported by : Ministry of Trade, Industry, and Energy

References

  1. Aashamar, M.Z. (2012), "Wave slamming forces on truss support structures for wind turbines", Master Thesis, Norwegian University of Science and Technology, Trondheim, Norway.
  2. Brook-Hart, W., Jakson, P.A., Meyts, M. and Gifford, P. (2010), "Competitive concrete foundations for offshore wind turbines", International Foundation.
  3. Cao, D., Yat-Man, E.L., Jian, W. and Huang, Z. (2016), "An experimental study of wave runup: cylinder fixed in waves versus cylinder surging in still water", ICCOE 2016-C1002, Tokyo, Japan.
  4. Chella, M.A., Torum, A. and Myrhaug, D. (2012), "An overview of wave impact forces on offshore wind turbine substructures", Energy Procedia, 20, 217-226. https://doi.org/10.1016/j.egypro.2012.03.022
  5. Christensen, E.D., Bredmose, H. and Hansen, E.A. (2005), "Extreme wave forces and wave run-up on offshore wind turbine foundations", Proceedings of Copenhagen Offshore Wind Conference, 1-10.
  6. De Vos, L., Frigaard, P. and Rouck, J.D. (2007), "Wave run-up on cylindrical and cone shaped foundations for offshore wind turbines", Coastal Eng., 54(1), 17-29. https://doi.org/10.1016/j.coastaleng.2006.08.004
  7. DNV (2013), Offshore Standard DNV-OS-J101: Design of Offshore Wind Turbine Structures, Det Norske Veritas AS, Norway.
  8. Fischer, T., De Vries, W. and Schmidt, B. (2010), Upwind Design Basis (WP4: Offshore Foundations and Support Structures), Upwind.
  9. Jeong, Y.J., Park, M.S. and You, Y.J. (2015), "Shape dependent wave force and bending moment of offshore wind substructure system", Int. J. Constr. Res. Civil Eng., 1(2), 16-26.
  10. Jeong, Y.J., You, Y.J., Park, M.S., Lee, D.H. and Kim, B.C. (2013), "Structural safety and design requirements of CFMP based offshore wind substructure system", OCEANS 2013-130505, Virginia, USA.
  11. Jeong, Y.J., You, Y.J., Park, M.S., Lee, D.H. and Kim, B.C. (2014), "CFMP based offshore wind substructure system and modular installation method", EWEA 2014-130505, Barcelona, Spain.
  12. Marino, E., Borri, C. and Peil, U. (2011), "A fully nonlinear wave model to account for breaking wave impact loads on offshore wind turbines", J. Wind Eng. Indus. Aerodyn., 99, 483-490. https://doi.org/10.1016/j.jweia.2010.12.015
  13. NEDO (2013), NEDO Offshore Wind Energy Progress, NEDO 2013, Japan.
  14. Park, M.S., Jeong, Y.J., You, Y.J. and Lee, D.H. (2015), "Numerical analysis of a gravity substructure with suction bucket foundation for 5MW offshore wind turbine", Offshore Technology; Offshore Geotechnics, St. John's, Newfoundland, Canada, May-June.
  15. Park, M.S., Jeong, Y.J., You, Y.J., Lee, D.H. and Kim, B.C. (2014), "Numerical analysis of a hybrid substructure for offshore wind turbine", Ocean Syst. Eng., 4(3), 169-183. https://doi.org/10.12989/ose.2014.4.3.169
  16. Park, M.S., Koo, W.C. and Choi, Y.R. (2010), "Hydrodynamic interaction with an array of porous circular cylinders", Int. J. Naval Arch. Ocean Eng., 2(3), 146-154. https://doi.org/10.3744/JNAOE.2010.2.3.146
  17. Park, M.S., Koo, W.C. and Kawana, K. (2012), "Numerical analysis of the dynamic response of an offshore platform with a pile-soil foundation system subjected to random waves and currents", J. Waterw. Port, Coast. Ocean Eng.,ASCE, 138(4), 275-285. https://doi.org/10.1061/(ASCE)WW.1943-5460.0000133
  18. Peng, Z. (2014), "Wave slamming impact on offshore wind turbine foundations", Coastal Engineering Conference, 1(34), 43..
  19. Rockmat (2013), Foundation for Rocky Seabeds, www.youtube.com/watchtv=-gToiG2OFOI, 2013.
  20. Ros, X. (2011), "Impact forces on a vertical pile from plunging breaking waves", Master Thesis, Norwegian University of Science and Technology, Department of Civil and Transport Engineering, Trondheim, Norway.

Cited by

  1. Wave Force Characteristics of Large-Sized Offshore Wind Support Structures to Sea Levels and Wave Conditions vol.9, pp.9, 2016, https://doi.org/10.3390/app9091855
  2. Extreme value modeling of structural load effects with non-identical distribution using clustering vol.74, pp.1, 2016, https://doi.org/10.12989/sem.2020.74.1.055
  3. Vortex-induced vibration characteristics of a low-mass-ratio flexible cylinder vol.75, pp.5, 2016, https://doi.org/10.12989/sem.2020.75.5.621