Offshore wind turbines are relatively complex structural and mechanical systems located in a highly demanding environment. In this study, the fundamental aspects and major issues related to the design of such structures are inquired. The system approach is proposed to carry out the design of the structural parts: in accordance with this philosophy, a decomposition of the system (environment, structure, actions/loads) and of the structural performance is carried out, in order to organize the qualitative and quantitative assessment in various sub-problems. These can be faced by sub-models of different complexity both for the structural behavior and for the load models. Numerical models are developed to assess the safety performance under aerodynamic and hydrodynamic actions. In the structural analyses, three types of turbine support structures have been considered and compared: a monopile, a tripod and a jacket.
BretonS.-P.MoeG., Status plans and technologies for offshore wind turbines in Europe and North America, Renewable Energy, 2009, 34 (3), 646–654.
3.
BontempiF., Basis of Design and expected Performances for the Messina Strait Bridge, Proceedings of the International Conference on Bridge Engineering – Challenges in the 21st Century, Hong Kong, 1–3 November, 2006.
4.
NASA (National Aeronautics and Space Administration), Systems Engineering Handbook, 1995. Available online on 10/2009 at: www.nasa.gov.
5.
SimonH.A., The Sciences of the Artificial, The MIT Press, Cambridge, 1998.
6.
BontempiF.GkoumasK.ArangioS., Systemic approach for the maintenance of complex structural systems, Structure and infrastructure engineering, 2008, 4, 77–94.
7.
SnelH., Review of Aerodynamics for Wind Turbines, Wind Energy, 2003, 6 (3), 203–211.
IbsenL. B.BrinckerR., Design of a New Foundation for Offshore Wind Turbines, Proceedings of the IMAC-22: A Conference on Structural Dynamics, Michigan, 26–29 January, 2004.
10.
ZaaijerM. B., Foundation modelling to assess dynamic behaviour of offshore wind turbines, Applied Ocean Research, 2006, 28 (1), 45–57.
11.
VeldkampD., A probabilistic approach to wind turbine fatigue design, Proceedings of the European wind energy conference and exhibition, Milan, 7–10 May, 2007.
12.
van der TempelJ., Design of support structures for offshore wind turbines, PdD Thesis, Technische Universiteit Delft, 2006.
13.
BiehlF.LehmannE., Collisions of Ships and Offshore Wind Turbines: Calculation and Risk Evaluation, Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering, Hamburg, 4–9 June, 2006.
14.
MartìnezE.SanzF.PellegriniS.JiménezE.BlancoJ., Life cycle assessment of a multi-megawatt wind turbine, Renewable Energy, 2009, 34 (3), 667–673.
15.
WeinzettelJ.ReenaasM.SolliC.HertwichE.G., Life cycle assessment of a floating offshore wind turbine, Renewable Energy, 2009, 34 (3), 742–747.
16.
SumurB.M.FredsøeJ., The mechanics of scour in the marine environment, World Scientific Publishing Co., Singapore, 2002.
17.
van der TempelJ.ZaaijerMB.SubrotoH., The effects of scour on the design of offshore wind turbines, Proceedings of the 3rd International conference on marine renewable energy, Blyth, July 6–9, 2004.
18.
HendersonA.R.PatelM.H., On the modeling of a floating Offshore Wind Turbines, Wind Energy, 2003, 6 (1), 53–86.
19.
JonkmanJ.M.BuhlM.L.Jr., Loads Analysis of a Floating Offshore Wind Turbine Using Fully Coupled Simulation, Proceedings of the WindPower Conference and exhibition, Los Angeles: California, June 3–6, 2007.
20.
API (American Petroleum Institute), Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms–Load and Resistance Factor Design (RP 2A-LRFD), 1993 (suppl. 1997).
21.
BSH (Bundesamt für Seeschifffahrt und Hydrographie), Standard: Design of Offshore Wind Turbines, 2007.
22.
DNV (Det Norske Veritas), Offshore Standard: Design of Offshore Wind Turbine Structures (DNV-OS-J101), 2004.
23.
GL (Germanischer Lloyd) Wind Energie GmbH, Richtlinie zur Erstellung von technischen Risikoanalysen für Offshore-Windparks, 2002.
24.
GL (Germanischer Lloyd) Wind Energie GmbH, Guideline for the Certification of Offshore Wind Turbines, 2005.
25.
IEC (International Electrotechnical Commission), Wind Turbine Generator Systems – part 3: Design requirements for offshore wind turbines (IEC 61400–3), 2009.
26.
BontempiF.LiH.PetriniF.GkoumasK., Basis of Design of Offshore Wind Turbines by System Decomposition, Proceedings of the 4th International Conference on Advances in Structural Engineering and Mechanics, Jeju, Korea, 26–28 May, 2008.
27.
StarossekU., Progressive Collapse of Structures, Thomas Telford Publishing, London, 2009.
28.
BontempiF.GiulianiL.GkoumasK., Handling the exceptions: Dependability of systems and structural robustness, Proceedings of the3rd International Conference on Structural Engineering, Mechanics and Computation, ZingoniAlphose (Ed.), Millpress, Rotterdam, 2007.
29.
PolnikovV.G.ManentiS., Study of relative role of nonlinearity and depth refraction in wave spectrum evolution in shallow water, Journal of Engineering Applications of Computational Fluid Mechanics,*2009, 3 (1), 42–55.
30.
BontempiF.LiH.PetriniF.ManentiS., Numerical modeling for the analysis and design of offshore wind turbines, Proceedings of the 4th International Conference on Advances in Structural Engineering and Mechanics, Jeju, Korea, 26–28 May, 2008.
31.
PetriniF.GiulianoF.BontempiF., Comparison of time domain techniques for the evaluation of the response and the stability in long span suspension bridges, Computer & Structures, 2007, 85, 1032–1048.
32.
Van BinhL.IshiharaT.Van PhucP.FujinoY., A peak factor for non-Gaussian response analysis of wind turbine tower, Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96 (10–11), 2217–2227.
33.
BrebbiaC.A.NewnesWalker S., Dynamic analysis of offshore structures, Butterworth, London, 1979.
