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Title: Physical and numerical modelling of hybrid monopiled-footing foundation systems
Author: Arshi, Harry
ISNI:       0000 0004 6063 2122
Awarding Body: University of Brighton
Current Institution: University of Brighton
Date of Award: 2016
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Offshore wind farms are becoming more and more popular as a source for producing more renewable energy. The offshore wind energy industry is gaining increased momentum as many countries such as The Netherlands, Denmark and UK are considered to be the lead in terms of technology used for the design, construction and maintenance of wind turbines (EWEA, 2004). It is thought that the potential for the offshore production of electricity in Europe is considered to be more than its consumption (Beurskens and Jensen, 2005). During the recent years in the UK alone, the number of wind turbines designed and installed per year has increase and this rate is to grow to an impressive number of 2.5 new turbines installed per day by the year 2020. This is based on the current government plans for the next round of wind farms (round 2 and 3) to be constructed 65 km from shore. Pile foundations transferred both compressive and tensile forces to from the structure and water above to the seabed and are the most common and preferred design solution. Operational wind turbines in the UK have monopile foundations and this popularity is due to the fact that they are simple to construct (using large steel tubing) and economical to manufacture compared to the other type of foundations available (Westage and DeJong, 2005). Monopile foundations, however, cannot currently be used for depths of beyond 30m with 3MW or heavier turbines. Moreover monopile diameters are limited to 5-6m and so are not economical for larger 5MW turbines for depth of over 20ms. The only feasible way for the monopile foundations to achieve the economical standards in deep water is by reducing their mass/MW ratio. Furhtermore, the feasibility of using monopile foundations in deep water is further compromised by (i) the cost of installing piles in significant water depths, and (ii) the compliant nature of the structure. With regard to the latter issue much promise had been shown by theoretical studies of a guyed monopile system (Bunce and Carey, 2001a and 2001b) however such an approach remains to be fully exploited. An alternative to the guyed system is to incorporate a bearing plate at the mudline such a degree of restraint is added to resist lateral loads. As a consequence the penetration depth of the monopile may also be reduced but the performance of the foundation system is maintained. The performance of a 'hybrid' foundation system comprising a monopiled-footing is the subject of the research presented in this thesis.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available