Blar i Institutt for marin teknikk på tidsskrift "Marine Structures"
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Experimental and finite element analysis of fatigue strength for 300 mm2 copper power conductor
(Journal article; Peer reviewed, 2014)The fatigue strength of a 300 mm2 stranded copper conductor was investigated experimentally and by finite element (FE) analysis. An analytical model was also developed and validated. Wires taken from the outer layer of the ... -
Experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals
(Peer reviewed; Journal article, 2020)The present paper addresses the stresses in dynamic steel tube umbilicals at the platform hang-off exposed to large motions corresponding to an extreme storm condition. Experimental tests were carried out by mounting ... -
Experimental and numerical study of the response of the offshore combined wind/wave energy concept SFC in extreme environmental conditions
(Journal article; Peer reviewed, 2016)This paper deals with an experimental study of the survivability of the offshore combined concept Semisubmersible wind energy and Flap-type wave energy Converter (SFC) and with comparisons of the experimental data with ... -
Experimental field study of floater motion effects on a main bearing in a full-scale spar floating wind turbine
(Peer reviewed; Journal article, 2021)In this paper we present a full-scale experimental field study of the effects of floater motion on a main bearing in a 6 MW turbine on a spar-type floating substructure. Floating wind turbines are necessary to access the ... -
Fatigue crack growth in mooring chain steel at different mean load levels
(Peer reviewed; Journal article, 2023)The fatigue crack growth rates of R4 mooring chain steel at different R-ratios are investigated. Crack growth experiments are performed at three different R-ratios, 0.1, 0.3 and 0.7, utilizing compact tension specimens in ... -
Friction models for evaluating dynamic stresses in non-bonded flexible risers
(Journal article; Peer reviewed, 2017)This paper addresses friction models used for evaluating dynamic stresses in non-bonded flexible risers. A review of the most commonly used methods to model friction between layers in such structures was performed. Four ... -
Glacial ice impacts: Part I: Wave-driven motion and small glacial ice feature impacts
(Peer reviewed; Journal article, 2021)Glacial ice features in the northern and central Barents Sea may threaten ships and offshore structures. Particularly, small glacial ice features, which are difficult to detect and manage by concurrent technologies, are ... -
Glacial ice impacts: Part II: Damage assessment and ice-structure interactions in accidental limit states (ALS)
(Peer reviewed; Journal article, 2021)Floating glacial ice features of various sizes pose a substantial threat to the structural integrity of offshore structures in ice-prone regions. Relatively small ice feathers, e.g., bergy bits and growlers, are a major ... -
Global slamming forces on jacket structures for offshore wind applications
(Journal article; Peer reviewed, 2018)This study investigates the global slamming forces due to plunging breaking waves on a jacket structure, based on the statistical analysis of the experimental data from the WaveSlam project. Hammer tests and wave tests ... -
Hydro-plastic response of beams and stiffened panels subjected to extreme water slamming at small impact angles, Part I: An analytical solution
(Journal article; Peer reviewed, 2019)Water impact (slamming) is a strongly nonlinear phenomenon including significant fluid structure interactions. In the case of slamming with a small impact angle between the structure and water, the coupling between ... -
Hydro-plastic response of beams and stiffened panels subjected to extreme water slamming at small impact angles, Part II: Numerical verification and analysis
(Journal article; Peer reviewed, 2019)An analytical model has been proposed for the response of beams and stiffened panels subjected to extreme flat or nearly flat water impacts in Part I of the two-part companion paper. The model aims to capture the significant ... -
Hydrodynamic load modeling and analysis of a floating bridge in homogeneous wave conditions
(Journal article; Peer reviewed, 2018)The Norwegian Public Road Administration (NPRA) is currently developing the E39 ferry-free project, in which several floating bridges will be built across deep and wide fjords. In this study, we consider the floating bridge ... -
Impact of model uncertainties on the fatigue reliability of offshore wind turbines
(Journal article; Peer reviewed, 2019)The impact of environmental load uncertainties on the spatial fatigue reliability of offshore wind turbine foundations is discussed and exemplified. Design procedures are utilizing overall or partial safety factors to ... -
Inhomogeneous wave load effects on a long, straight and side-anchored floating pontoon bridge
(Peer reviewed; Journal article, 2020)In this paper, we present a numerical study on the hydroelastic response of a 4.6 km long fjord crossing floating bridge subjected to wave loads. The bridge is straight in design and supported by 35 pontoons along its full ... -
Integrated design optimization of spar floating wind turbines
(Peer reviewed; Journal article, 2020)A linearized aero-hydro-servo-elastic floating wind turbine model is presented and used to perform integrated design optimization of the platform, tower, mooring system, and blade-pitch controller for a 10 MW spar floating ... -
Integrated optimisation design of a dynamic umbilical based on an approximate model
(Peer reviewed; Journal article, 2021)An optimised design of a dynamic umbilical requires an extreme cross-sectional stress to be maintained within an allowable limit and a fatigue life to be guaranteed to be sufficient. It should be noted that a dynamic ... -
The ISSC 2022 committee III.1-Ultimate strength benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads
(Peer reviewed; Journal article, 2021)This paper presents a benchmark study on the ultimate limit state analysis of a stiffened plate structure subjected to uniaxial compressive loads, initiated and coordinated by the ISSC 2022 technical committee III.1-Ultimate ... -
Joint description of waves and currents applied in a simplified load case
(Journal article, 2018)In order to perform a more accurate analysis of marine structures, joint probability distributions of different metocean parameters have received an increasing interest during the last decade, facilitated by improved ... -
Large Eddy Simulations of flow around a circular cylinder close to a flat seabed
(Journal article, 2016)Large Eddy Simulations (LES) with Smagorinsky subgrid scale model are used to study the turbulent flow and wake dynamics behind a circular cylinder close to a horizontal, plane wall at subcritical Reynolds number. The focus ... -
Large inelastic deformation resistance of stiffened panels subjected to lateral loading
(Journal article, 2018)This paper presents a simplified formulation for the assessment of large deformation resistance of stiffened panels subjected to lateral loading. The method is based on rigid plastic material assumptions and the use of ...