Browsing NGI articles by Author "Eiksund, Gudmund Reidar"
Now showing items 1-10 of 10
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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 (Peer reviewed; Journal article, 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 macro-element model for multidirectional cyclic lateral loading of monopiles in clay
Page, Ana M.; Grimstad, Gustav; Eiksund, Gudmund Reidar; Jostad, Hans Petter (Journal article; Peer reviewed, 2018)This paper investigates numerically the impact of multidirectional cyclic loads on the response of a monopile in clay supporting an offshore wind turbine (OWT). The results indicate that multidirectional loading modifies ... -
A macro-element pile foundation model for integrated analyses of monopilebased offshore wind turbines
Page, Ana M.; Grimstad, Gustav; Eiksund, Gudmund Reidar; Jostad, Hans Petter (Journal article; Peer reviewed, 2018)The design of OWTs relies on integrated load analyses tools that simulate the response of the entire OWT (including the rotor-nacelle assembly, support structure and foundation) under combined aerodynamic and hydrodynamic ... -
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 (Peer reviewed; Journal article, 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 ... -
An anisotropic shear strength model for cyclic accumulated plastic strain of overconsolidated clay
Cai, Fang; Eiksund, Gudmund Reidar; Grimstad, Gustav; Jostad, Hans Petter (Journal article, 2014)Many geotechnical problems involve calculation of the permanent deformation of overconsolidated clay under undrained cyclic loading. There are many existing methods in the literature which have been made for predicting ... -
Assessment of the impact of pile driving on slope stability
Attari, Yeganeh; Eiksund, Gudmund Reidar; Jostad, Hans Petter (Lecture, 2023)Driving piles near slopes can be challenging in terms of temporarily reducing slope stability, specifically in the presence of sensitive clay or lenses of sand and silt in the ground. There is currently no standard method ... -
Evaluation of Pile Driving Effects on Slope Stability in Clay
Attari, Yeganeh; Jostad, Hans Petter; Grimstad, Gustav; Eiksund, Gudmund Reidar (Peer reviewed; Journal article, 2023) -
Impact of foundation modelling in offshore wind turbines: Comparison between simulations and field data
Page, Ana M.; Næss, Veronika; De Vaal, Jacobus Bernardus; Eiksund, Gudmund Reidar; Nygaard, Tor Anders (Journal article; Peer reviewed, 2019)The design of Offshore Wind Turbines (OWTs) relies on integrated simulation tools capable of predicting the system dynamic characteristics and the coupled loads and responses. Despite allefforts to develop accurate integrated ... -
Modelling of soil-structure-interaction for flexible caissons for offshore wind turbines
Skau, Kristoffer Skjolden; Jostad, Hans Petter; Eiksund, Gudmund Reidar; Sturm, Hendrik (Peer reviewed; Journal article, 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. (Peer reviewed; Journal article, 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 ...