Hybrid foundations for offshore wind turbines

Floridia, Daniele (2012) Hybrid foundations for offshore wind turbines. [Laurea magistrale], Università di Bologna, Corso di Studio in Civil engineering [LM-DM270], Documento ad accesso riservato.
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Nowadays offshore wind turbines represents a valid answer for energy production but with an increasing in costs mainly due to foundation technology required. Hybrid foundations composed by suction caissons over which is welded a tower supporting the nacelle and the blades allows a strong costs reduction. Here a monopod configuration is studied in a sandy soil in a 10 m water depth. Bearing capacity, sliding resistance and pull-out resistance are evaluated. In a second part the installation process occurring in four steps is analysed. considering also the effect of stress enhancement due to frictional forces opposing to penetration growing at skirt sides both inside and outside. In a three dimensional finite element model using Straus7 the soil non-linearity is considered in an approximate way through an iterative procedure using the Yokota empirical decay curves.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Floridia, Daniele
Relatore della tesi
Correlatore della tesi
Corso di studio
Curriculum: Territorial infrastructures
Ordinamento Cds
Parole chiave
Suction caisson, bucket foundation, offshore foundation, Yokota decay curves, offshore, wind turbines, monopod, suction, API, DNV, soil degradation, stiffness reduction.
Data di discussione della Tesi
19 Marzo 2012

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