Browsing NTNU Open by Author "Amdahl, Jørgen"
Now showing items 1-20 of 139
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A comparative analysis of the fluid-structure interaction method and the constant added mass method for ice-structure collisions
Song, Ming; Kim, Ekaterina; Amdahl, Jørgen; Ma, Jun; Huang, Yi (Journal article, 2016)The constant added mass (CAM) method and the fluid-structure interaction (FSI) method are widely used to simulate ship-ship and ship-ice collisions. In the CAM method, the hydrodynamic effect of the surrounding water is ... -
A new combination of conditional environmental distributions
Horn, Jan-Tore H.; Bitner-Gregersen, Elzbieta M.; Krokstad, Jørgen R; Leira, Bernt Johan; Amdahl, Jørgen (Journal article, 2018)In this paper, a joint distribution of all relevant environmental parameters used in design of offshore structures including directional components is presented, along with a novel procedure for dependency modelling between ... -
A review of structural responses and design of offshore tubular structures subjected to ship impacts
Yu, Zhaolong; Amdahl, Jørgen (Journal article, 2018)Over the past decades, the offshore oil and gas industry has developed rapidly. A large number of offshore structures, notably jacket and jack-up platforms, were constructed and installed worldwide. As they are often exposed ... -
A simplified analytical method for predictions of ship deckhouse collision loads on steel bridge girders
Sha, Yanyan; Amdahl, Jørgen (Journal article; Peer reviewed, 2018)Bridges across busy navigation channels are under the threat of accidental ship collisions. Many research works have been conducted to investigate the structural responses during ship bow-bridge pier collisions. However, ... -
Accidental Impact Resistance of non-disconnectable bouy type FPSO
Slagstad, Martin (Master thesis, 2014)The surroundings of offshore structures consist of many components controlled by nature, but also some that are managed by people- ships. Due these factors, ship collisions are a constant threat to offshore installations ... -
ACCURACY OF SIMPLIFIED METHODS FOR FATIGUE DAMAGE ESTIMATION OF EXPOSED FISH FARMS
Bore, Pål Takle; Amdahl, Jørgen (Peer reviewed; Journal article, 2020)Fish farms are being placed in more exposed locations than earlier, encouraged by the “development licenses” that the Norwegian Directorate of Fisheries have introduced. Traditional design methods for estimating fatigue ... -
Active Load Mitigation to Counter the Fatigue Damage Contributions From Unavailability in Offshore Wind Turbines
Sørum, Stian Høegh; Smilden, Emil; Amdahl, Jørgen; Sørensen, Asgeir Johan (Chapter, 2018)The offshore wind industry continues to grow, but there is still a need for more economical designs. As unavailability conditions can be critical for the fatigue damage in support structures, design standards use conservative ... -
Adequate linearization scheme for a jack-up in order to obtain sufficiently accurate fatigue assessments using a linear stochastic fatigue analyses
Karlsson, Marius Tveit (Master thesis, 2017)Different techniques for linearizing the response of drag dominated structures is in this work inspected in terms of fatigue damage. To establish reference response characteristics, time domain simulations are carried out. ... -
Alternative methods of realizing the sea spectrum for time-domain simulations of marine structures in irregular seas
Bækkedal, Eivind (Master thesis, 2014)For dynamically sensitive structures or marine structures subjected to large displacements the extreme response is often determined on the basis of short term time domain simulation of extreme sea states using the environmental ... -
An efficient approach for ship collision design of reinforced concrete pontoon walls
Sha, Yanyan; Amdahl, Jørgen; Yang, Kun (Journal article; Peer reviewed, 2019)This paper presents an efficient method for collision design of prestressed concrete pontoon walls. High fidelity finite element models of a container ship bow and a prestressed concrete pontoon wall are first established. ... -
Analyse og dimensjonering av Halsafjordens strekkstag understøttede hengebro utsatt for støt fra store skip
Holm, Jørgen Thode Gryteland (Master thesis, 2016)I 2014 la Stortinget frem ambisjonen om å bygge broer for å erstatte fergesambandene på alle fjordkrysningene langs E-39 mellom Kristiansand og Trondheim. Flere av fjordene er så dype og brede at det ikke er gjennomførbart ... -
Analysis and Design Bjørnefjorden Floating Cable-Stayed Bridge subjected to Large Ship Collisions and Extreme Environmental Loads
Wang, Boya (Master thesis, 2017)The safe pontoon has the additional ring stiffeners and the thicker girders and ring stiffeners as well. The peak forces corresponding to the original pontoon and the proposed pontoon are 26MN and 42MN respectively. The ... -
Analysis and Design Bjørnefjorden Floating Cable-Stayed Bridge subjected to Large Ship Collisions and Extreme Environmental Loads
Aalberg, Aleksander (Master thesis, 2017)The purpose of this master thesis is to analyse one of the proposed bridge design for the Bjørnafjorden crossing, exposed to extreme environmental loads and large ship impacts. This is a floating cable-stayed bridge with ... -
Analysis and Design Bjørnefjorden TLP Supported Suspension Bridge subjected to Large Ship Collisions and Extreme Environmental Loads - Analyse og dimensjonering Bjørnefjorden TLP understøttede hengebro utsatt for støt fra store skip og ekstreme miljøkrefter
Zamudio, Victor Romero (Master thesis, 2017)The local analysis and structural design of the floating pylon for the Bjørnefjorden TLP Supported Suspension Bridge was performed. Ship collision analysis were conducted for the bow of a container vessel in order to design ... -
Analysis and Design of Bjørnafjorden TLP Supported Suspension Bridge Subjected to Large Ship Collisions and Extreme Environmental Loads
Moe, Ole Harald (Master thesis, 2016)The objective of this thesis is to study the global response of a tether anchored floating suspension bridge over Bjørnafjorden when it is subjected to ship impacts and extreme environmental loads. Bjørnafjorden south of ... -
Analysis and Design of Bjørnefjorden Floating Cable-Stayed Bridge subjected to Large Ship Collisions and Extreme Environmental Loads
Osvoll, Ida Fagerli (Master thesis, 2018)The objective of this master thesis is to study the global behaviour of the end-anchored floating bridge across the Bjørnafjord when it is subjected to high energy ship collision and extreme environmental loads. The ... -
Analysis and Design of Columns in Offshore Structures subjected to Supply Vessel Beam Collisions
Kristiansen, Line (Master thesis, 2013)The recommended force-deformation curves for supply vessels collision presented in NORSOK N-004 are based on simplified methods and tests developed more than 30 years ago. The purpose of this work is to contribute to the ... -
Analysis and Design of Columns in Offshore Structures subjected to Supply Vessel Beam Collisions
Qvale, Kjetil Hatlestad (Master thesis, 2012)During this Master Thesis, leg-segments of jacket platforms subjected to supply vessel impacts have been considered. Finite element analyses (FEA) have been conducted using the explicit solver LS DYNA. The FEA results have ... -
Analysis and Design of Columns in Offshore Structures subjected to Supply Vessel Collisions
Watan, Reny (Master thesis, 2011)The assessment had been conducted for shipside collision against unstiffened, inclined jacket leg segment (column). The inclined column has been modelled with horizontal-to-vertical ratio of 1/7. Two types of boundary ... -
Analysis and Design of Floating Bridge over Bjørnefjorden - Floating Bridge Subjected to Large Ship Collisions
Eldegard, Ole (Master thesis, 2017)In This Master s Thesis, a bridge design for the crossing of Bjørnafjorden have been investigated. The design was developed in a cooperation between COWI, Aas Jakobsen, Johs Holte As and Global Maritime, as a part of The ...