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Simplified Design of Offshore Wind Turbine Jackets Supported on Multiple Foundations Incorporating Soil-Structure Interaction

Jalbi, M Saleh (2019) Simplified Design of Offshore Wind Turbine Jackets Supported on Multiple Foundations Incorporating Soil-Structure Interaction Doctoral thesis, University of Surrey.

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Foundations are one of the most expensive items in the capital cost break down of an offshore wind farm and the design is a challenging and multidisciplinary task that requires an understanding of the aerodynamics, hydrodynamics, structural dynamics, and soil-structure interaction. Though there has been extensive research, foundation codes are still not fully developed and are heavily dependent on the principles developed for oil & gas platforms which have distinct differences with offshore wind installations. Furthermore, current offshore wind turbines are becoming larger in size and installed in deeper waters, thus jackets are becoming a more attractive option when compared to the conventional monopiles. However, the current design methods for jackets are computationally challenging and time consuming, and often is the case, require data that is unavailable in the public domain which makes concept designs a difficult process. Due to the lack of simple integrated approaches, this thesis focuses on developing an integrated and modular design approach which can be easily implemented on spreadsheet type software and result in a conservative foundation size with adequate accuracy. The design criteria covered in this thesis are the Ultimate Limit State (ULS), Serviceability Limit State (SLS), and the natural Frequency requirements. For the dynamic analysis of foundations, a novel approach is proposed that expresses the natural frequency of the system in terms of mechanics based approaches considering the flexibility of the jackets and supporting foundations. The analysis steps from the thesis are compiled into an integrated design approach applied to jackets and their supporting foundations named as the “10-step method”. It is shown that following these steps will result in a similar jacket and foundation size as detailed designs. The approaches of this thesis are expected to be a very powerful tool in the concept design stage when the financial viability of a wind farm is assessed. The work of this thesis also sets “templates” of appropriate jacket and foundation sizes in the detailed design stage. Finally, future works and enhancement to the work of this thesis are also provided.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
Jalbi, M Saleh0000-0002-6660-7492
Date : December 2019
DOI : 10.15126/thesis.00853214
Contributors :
Uncontrolled Keywords : Offshore wind, Jackets, Piles, Suction Caissons, Multiple Foundations, Soil-Structure Interaction, Natural Frequency
Depositing User : M Saleh Jalbi
Date Deposited : 03 Jan 2020 15:09
Last Modified : 03 Jan 2020 15:10

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