Browsing NTNU Open by Author "Skau, Kristoffer Skjolden"
Now showing items 1-9 of 9
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A macro-element for integrated time domain analyses representing bucket foundations for offshore wind turbines
Skau, Kristoffer Skjolden; Grimstad, Gustav; Page, Ana M.; Eiksund, Gudmund Reidar; Jostad, Hans Petter (Journal article; Peer reviewed, 2018)The paper presents a macro-element model for bucket foundations to be used in integrated time domain analyses of offshore wind turbines. The macro-element has been formulated in the multi-surface plasticity framework, and ... -
A New Foundation Model for Integrated Analyses of Monopile-based Offshore Wind Turbines
Page, Ana M.; Skau, Kristoffer Skjolden; Jostad, Hans Petter; Eiksund, Gudmund Reidar (Journal article; Peer reviewed, 2017)Offshore wind turbines are highly dynamic and tightly coupled systems subjected to variable cyclic loads. Designing and optimizing the support structure is a complex task, where several load scenarios have to be analysed ... -
A numerical study of capacity and stiffness of circular skirted foundations in clay subjected to combined static and cyclic general loading
Skau, Kristoffer Skjolden; Chen, Ying; Jostad, Hans Petter (Journal article; Peer reviewed, 2017)Skirted foundations have been widely applied as offshore foundations for several decades. In design, the use of failure envelopes is convenient for assessing stability under combined loading. A large number of studies on ... -
Alternative Numerical Pile Foundation Models for Integrated Analyses of Monopile-based Offshore Wind Turbines
Page, Ana M.; Schafhirt, Sebastian; Eiksund, Gudmund Reidar; Skau, Kristoffer Skjolden; Jostad, Hans Petter; Sturm, Hendrik (Chapter, 2016)Lowering the cost for offshore wind energy remains a major challenge. Increasing the accuracy of analysis tools used in the design and optimization process can strengthen the reliability and reduce conservatism, thereby ... -
Bucket Foundation in Clay for OWT Subjected to Combined Cyclic Loads
Chen, Ying (Master thesis, 2014)This thesis project investigates the bucket foundation in clay subjected to cyclic loads. The cyclic irregular loading history in this thesis was represented by the equivalent number of cycles Neq with a certain level of ... -
Effect of foundation modelling on the fatigue lifetime of a monopile-based offshore wind turbine
Aasen, Steffen; Page, Ana M.; Skau, Kristoffer Skjolden; Nygaard, Tor Anders (Journal article; Peer reviewed, 2017)everal studies have emphasized the importance of modelling foundation response with representative damping and stiffness characteristics in integrated analyses of offshore wind turbines (OWTs). For the monopile foundation, ... -
Modelling of skirted foundations for offshore wind turbines
Skau, Kristoffer Skjolden (Doctoral theses at NTNU;2018:140, Doctoral thesis, 2018)The thesis focuses on the modelling of the response of shallow skirted foundations supporting offshore wind turbines (OWT). OWT-structures need to be optimized in design to reduce the cost of energy from offshore wind ... -
Modelling of soil-structure-interaction for flexible caissons for offshore wind turbines
Skau, Kristoffer Skjolden; Jostad, Hans Petter; Eiksund, Gudmund Reidar; Sturm, Hendrik (Journal article; Peer reviewed, 2018)Published foundation models and procedures for calculation of caisson foundation response typically assume a rigid caisson in deformable soil. However, recent published measurement data from a prototype suction bucket ... -
REDWIN – REDucing cost in offshore WINd by integrated structural and geotechnical design
Skau, Kristoffer Skjolden; Page, Ana M.; Kaynia, Amir M.; Løvholt, Finn; Norén-Cosgriff, Karin; Sturm, Hendrik; Andersen, H.S.; Nygaard, Tor Anders; Jostad, Hans Petter; Eiksund, Gudmund Reidar; Havmøller, O.; Strøm, P.; Eichler, D. (Journal article; Peer reviewed, 2018)The cost of offshore wind energy production has to be reduced continuously to improve its competitiveness compared to other energy sources. To contribute to this goal, a 4- year research project REDWIN – REDucing cost of ...