A master thesis from Aalborg University
Development of driveability model for piles for offshore wind turbines
Author(s)
Term
4. term
Education
Publication year
2017
Submitted on
2017-06-08
Pages
157 pages
Abstract
This project contains a study of driveability analysis of offshore monopiles driven in sands, which identifies the key components, methods and models involved. The most commonly applied computer program used in these predictions is not truly dynamic and uses some assumptions which may not be appropriate for all situations. An input to the program, the static resistance to driving (SRD), along with a set of parameters relating the resistance to the stiffness and damping within the soil, are not uniquely defined. A thorough investigation into various SRD models is performed, which finds that the models are all semi-empirical and that they can not be expected to be reliable for conditions dissimilar to the conditions from which they were derived. A fully dynamic model seeking to overcome some of the simplifications, using three different discretization regimes for pile, side friction and tip resistance, and using a more advanced transient solving algorithm is developed and tested for sensitivity to model parameters. The SRD models are applied within the model to investigate their ability to reproduce an available driving record from a pile installed in the North Sea, and large variations in accuracy are found.
Keywords
Monopæl ; Driveability ; elementmetode ; finite element ; numerisk ; SRD ; wave equation
Documents
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