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Numerical modelling of offshore foundations for jacket structures
Nowadays the offshore wind industry continues to push towards larger turbines with capacities greater than 8MW in deeper waters. The realization of such wind farms requires that the costs of the overall offshore wind turbine system are significantly reduced, in order to give the offshore wind industry an increasing edge in the competition with fossil-fuel-based energy sources. The cost-reduction target set can be achieved either by adopting new technologies or by optimizing design methods and existing technologies. One of the areas where cost reductions can be met is in the support structure. For an offshore wind turbine structure, the support structure design typically has some global requirements, e.g. frequency. The global constraints are influenced by both the soil properties and the foundation design. Hence, it is necessary to account for the possibilities of dynamic effects of the soil-foundation interaction in order to achieve reliable responses of the wind turbine structure. The aim of this thesis is to evaluate the dynamic soil-foundation interaction of offshore wind turbines, focusing on different types of foundations (suction caissons and hollow steel piles), different load conditions (cyclic and dynamic) and soil conditions. Moreover, two approaches were followed in the soil modelling: small strain approach in which elastodynamic constitutive soil model is considered and large strain approach, where elasto-plastic constitutive soil model is taken into account. The models adopted in this study can be classied as: a) simple analytical formulations and b) continuum finite element models (FEM). In the abovementioned models the soil is simplified as a homogeneous linear viscoelastic material. Existing analytical elastic solutions, which deal with the dynamic soil pile interaction, have been revisited and extended to account for different soil profiles and foundation geometries. Continuum finite element models have been developed for validation of the analytical procedures, and a parametric study has been ...
Numerical modelling of offshore foundations for jacket structures
Nowadays the offshore wind industry continues to push towards larger turbines with capacities greater than 8MW in deeper waters. The realization of such wind farms requires that the costs of the overall offshore wind turbine system are significantly reduced, in order to give the offshore wind industry an increasing edge in the competition with fossil-fuel-based energy sources. The cost-reduction target set can be achieved either by adopting new technologies or by optimizing design methods and existing technologies. One of the areas where cost reductions can be met is in the support structure. For an offshore wind turbine structure, the support structure design typically has some global requirements, e.g. frequency. The global constraints are influenced by both the soil properties and the foundation design. Hence, it is necessary to account for the possibilities of dynamic effects of the soil-foundation interaction in order to achieve reliable responses of the wind turbine structure. The aim of this thesis is to evaluate the dynamic soil-foundation interaction of offshore wind turbines, focusing on different types of foundations (suction caissons and hollow steel piles), different load conditions (cyclic and dynamic) and soil conditions. Moreover, two approaches were followed in the soil modelling: small strain approach in which elastodynamic constitutive soil model is considered and large strain approach, where elasto-plastic constitutive soil model is taken into account. The models adopted in this study can be classied as: a) simple analytical formulations and b) continuum finite element models (FEM). In the abovementioned models the soil is simplified as a homogeneous linear viscoelastic material. Existing analytical elastic solutions, which deal with the dynamic soil pile interaction, have been revisited and extended to account for different soil profiles and foundation geometries. Continuum finite element models have been developed for validation of the analytical procedures, and a parametric study has been ...
Numerical modelling of offshore foundations for jacket structures
Latini, Chiara (author)
2018-01-01
Latini , C 2018 , Numerical modelling of offshore foundations for jacket structures . B Y G D T U. Rapport , no. 391 , Technical University of Denmark, Department of Civil Engineering .
Book
Electronic Resource
English
DDC:
690
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