[en] This paper presents some new analytical developments carried out to assess the energy dissipated
plastically at the base of an offshore wind turbine jacket impacted by a ship. The jacket components
involved in this mechanism are both the impacted leg and the rear leg, considered as
clamped at the foundation level, as well as the horizontal bottom brace considered as rigidly
fixed on the legs. The foundation system is assumed to be piles inserted into sleeves with cement
grout. The base of the jacket is divided into four zones and a kinematically admissible displacement
field is assumed for each of them. Based on plastic limit analysis, new analytical
formulations are derived to assess the resistance and the dissipated energy for each considered
area and therefore of the whole jacket base. To validate the method, full scale ship-jacket collisions
are simulated both analytically and numerically and plastic energy dissipated at the base
of the jacket is compared successfully with nonlinear finite element simulation results.
Disciplines :
Civil engineering
Author, co-author :
Pire, Timothée ; Université de Liège - ULiège > Département ArGEnCo > ANAST (Systèmes de transport et constructions navales)
Le Sourne, Hervé ; Université de Liège - ULiège > Département ArGEnCo > Constructions hydrauliques et navales
Echeverry Jaramillo, Sara ; Université de Liège - ULiège > Département ArGEnCo > ANAST (Systèmes de transport et constructions navales)
Rigo, Philippe ; Université de Liège - ULiège > Département ArGEnCo > Constructions hydrauliques et navales
Language :
English
Title :
Analytical formulations to assess the energy dissipated at the base of an offshore wind turbine jacket impacted by a ship
Alternative titles :
[fr] Formulations analytiques pour évaluer l'énergie dissipée à la base d'un jacket d'éolienne offshore impacté par un navire
Amdahl, J., Holmas, T., High energy ship collisions with jacket supported offshore wind turbines. Proceedings of the international conference on computational methods in marine engineering, Barcelona, Spain, 2011.
Vredeveldt, A.W., Schipperen, J.H.A., Nassar, Q.H.A., Spaans, C.A., Safe jacket configurations to resist boat impact. Leira, J., (eds.) Collision and grounding of ships and offshore structures, 2013 London.
Amdahl, J., Johansen, A., High-energy ship collision with jacket legs. Proceedings of the 11th international offshore and polar engineering conference, Stavanger, Norway, 2001.
Le Sourne, H., Barrera, A., Maliakel, J.B., Numerical crashworthiness analysis of an offshore wind turbine jacket impacted by a ship. J Mar Sci Technol 23:5 (2015), 694–704.
Jones, N., Structural impact. 1997, Cambridge University Press, Cambridge.
Soreide, T., Amdahl, J., Eberg, E., Homas, T., Hellan, O., USFOS: A Computer Program for Progressive Collapse Analysis of Steel Offshore Structures. 1993, SINTEF http://www.usfos.no/manuals/usfos/theory/documents/Usfos_Theory_Manual.pdf.
Le Sourne, H., Pire, T., Hsieh, J.R., Rigo, P., New analytical developments to study local and global deformations of an offshore wind turbine jacket impacted by a ship. Proceedings of international conference on collision and grounding of ships, Pusan, Korea, 2016.
Buldgen, L., Le Sourne, H., Pire, T., Extension of the super-elements method to the analysis of a jacket impacted by a ship. Mar Struct 38 (2014), 44–71.
Hoo Fatt, M.S., Wierzbicki, T., Damage of plastic cylinders under localized pressure loading. Int J Mech Sci 33 (1991), 999–1016.
Wierzbicki, T., Suh, M.S., Indentation of tubes under combined loading. Int J Mech Sci 30 (1988), 229–248.
Zeinoddini, M., Harding, J.E., Parke, G.A.R., Effect of impact damage on the capacity of tubular steel members of offshore structures. Mar Struct 11 (1998), 141–157.
Hsieh, J.R., analytical formulations for ship-offshore wind turbine collisions. Nantes: ICAM, in the framework of EMSHIP erasmus mundus master course in integrated advanced ship design., 2015 [Master Thesis].
Aristizabal-Ochoa, J.D., First- and second-order stiffness matrices and load vector of beam-column with semi rigid connections. J Struct Eng, 1997, 669–678.
European committee for standardazation, Eurocode 3: design of steel structures EN1993. 2005.
Lehmann, E., Peschmann, J., Energy absorption by the steel structure of ships in event of collisions. Mar Struct 15 (2002), 429–441.
Suh, M.S., Plastic analysis of dented tubes subjected to combined loading., 1987, Massachusetts Institute of Technology, Department of Ocean Engineering, Cambridge [Ph. D. thesis].
de Oliveira, J., Wierzbicki, T., Abramowicz, W., Plastic behavior of tubular members under lateral concentrated load. DNV Technical Report n_82-0708, 1982.
Singace, A.A., Elsobky, H., Reddy, T.Y., On the eccentricity factor in the progressive crushing of tubes. Int J Solid Struct 32:24 (1995), 3589–3602.
Singace, A.A., Axial crushing analysis of tubes deforming in the multi-lobe mode. Int J Mech Sci 41 (1999), 865–890.
Sugimoto, H., Wai-Fah, C., Inelastic post-buckling behavior of tubular members. J Struct Eng 111 (1985), 1965–1978.
Alexander, J.M., An approximate analysis of the collapse of thin cylindrical shells under axial loading. Q J Mech Appl Math 13 (1960), 10–15.
Pire, T., Echeverry Jaramillo, S., Rigo, P., Buldgen, L., Le Sourne, H., Validation of a simplified method for the crashworthiness of offshore wind turbine jackets using finite elements simulations. Proceedings of MARSTRUCT 2017, Lisbon, Portugal, 2017.
