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Hagbart S. Alsos
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Proceedings Papers

Estimation and Experimental Validation of Extreme Waves and Loads on a Large Monopile

Csaba Pakozdi, Hagbart S. Alsos, Senthuran Ravinthrakumar, Synne Nyboe, Louise Ankerstjerne Rolland, Knut Nordheim
Proc. ASME. OMAE2024, Volume 7: Ocean Renewable Energy, V007T09A046, June 9–14, 2024
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2024-127967
https://doi.org/10.1115/OMAE2024-127967
View Paper titled, Estimation and Experimental Validation of Extreme Waves and Loads on a Large Monopile
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Topics: Stress, Waves, Statistics, Numerical analysis, Seas, Boundary-value problems, Computer software, Drag (Fluid dynamics), Inertia (Mechanics), Kinematics
Proceedings Papers

Empire Wind Model Tests - Wave Loads and Responses

Hagbart S. Alsos, Senthuran Ravinthrakumar, Ole David Økland, Csaba Pâkozdi, Louise Ankerstjerne Rolland, Knut Nordheim
Proc. ASME. IOWTC2022, ASME 2022 4th International Offshore Wind Technical Conference, V001T02A001, December 7–8, 2022
Publisher: American Society of Mechanical Engineers
Paper No: IOWTC2022-98625
https://doi.org/10.1115/IOWTC2022-98625
View Paper titled, Empire Wind Model Tests - Wave Loads and Responses
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Topics: Stress, Waves, Wind
Proceedings Papers

Nonlinear Wave Load Models for Extra Large Monopiles

Csaba Pákozdi, Silas Spence, Sebastien Fouques, Maxime Thys, Hagbart S. Alsos, Erin E. Bachynski, Hans Bihs, Arun Kamath
Proc. ASME. IOWTC2018, ASME 2018 1st International Offshore Wind Technical Conference, V001T01A033, November 4–7, 2018
Publisher: American Society of Mechanical Engineers
Paper No: IOWTC2018-1083
https://doi.org/10.1115/IOWTC2018-1083
View Paper titled, Nonlinear Wave Load Models for Extra Large Monopiles
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Topics: Nonlinear waves, Stress, Waves, Kinematics, Computational fluid dynamics, Design, Engineering simulation, Modeling, Morison equation, Ocean engineering
Journal Articles

Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions

Martin Storheim, Hagbart S. Alsos, Jørgen Amdahl
Journal: Journal of Offshore Mechanics and Arctic Engineering
Publisher: ASME
Article Type: Research-Article
J. Offshore Mech. Arct. Eng. August 2018, 140(4): 041401.
Paper No: OMAE-17-1044
https://doi.org/10.1115/1.4038585
Published Online: January 9, 2018
View Article titled, Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions
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Topics: Fracture (Materials), Fracture (Process), Safety, Hardening, Simulation, Stress
Proceedings Papers

Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions

Martin Storheim, Hagbart S. Alsos, Jørgen Amdahl
Proc. ASME. OMAE2017, Volume 3A: Structures, Safety and Reliability, V03AT02A006, June 25–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2017-61861
https://doi.org/10.1115/OMAE2017-61861
View Paper titled, Evaluation of Nonlinear Material Behavior for Offshore Structures Subjected to Accidental Actions
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Topics: Ductile fracture, Hardening, Offshore structures, Safety
Proceedings Papers

Advanced Pipeline Impact Design

Ragnar T. Igland, Hagbart S. Alsos, Stig Olav Kvarme
Proc. ASME. OMAE2016, Volume 5: Pipelines, Risers, and Subsea Systems, V005T04A041, June 19–24, 2016
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2016-54855
https://doi.org/10.1115/OMAE2016-54855
View Paper titled, Advanced Pipeline Impact Design
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Topics: Design, Pipelines, Damage, Deformation, Energy dissipation, Kinetic energy, Ocean engineering, Coating processes, Coatings, Deflection
Proceedings Papers

Analysis of Clump-Weight Interference With Offshore Pipelines: Mechanisms and Actions

Hagbart S. Alsos, Åsta O. Wendel, Stig Olav Kvarme, Svein Sævik
Proc. ASME. OMAE2016, Volume 5: Pipelines, Risers, and Subsea Systems, V005T04A030, June 19–24, 2016
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2016-54196
https://doi.org/10.1115/OMAE2016-54196
View Paper titled, Analysis of Clump-Weight Interference With Offshore Pipelines: Mechanisms and Actions
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Topics: Underwater pipelines, Weight (Mass), Pipelines, Design, Stress, Arches, Differential equations, Drag (Fluid dynamics), Friction, Gears
Proceedings Papers

Estimates of the Number of Vibration Cycles From Frequency Locked-in Ice Loads

Morten Bjerkås, Hagbart S. Alsos, Kasper Wåsjø
Proc. ASME. OMAE2014, Volume 10: Polar and Arctic Science and Technology, V010T07A008, June 8–13, 2014
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2014-23134
https://doi.org/10.1115/OMAE2014-23134
View Paper titled, Estimates of the Number of Vibration Cycles From Frequency Locked-in Ice Loads
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Topics: Cycles, Ice, Stress, Vibration, Locks (Waterways)
Proceedings Papers

Detailed Analysis of Clump-Weight Interference With Subsea Pipelines

Kristian Maalø, Hagbart S. Alsos, Svein Sævik
Proc. ASME. OMAE2012, Volume 3: Pipeline and Riser Technology, 725-732, July 1–6, 2012
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2012-83869
https://doi.org/10.1115/OMAE2012-83869
View Paper titled, Detailed Analysis of Clump-Weight Interference With Subsea Pipelines
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Topics: Underwater pipelines, Weight (Mass), Pipelines, Gears, Computer software, Design, Displacement, Engineering simulation, Finite element analysis, Free spanning pipelines
Proceedings Papers

Evaluation of Pipeline Impact Damage

Hagbart S. Alsos, Ragnar T. Igland, Tore H. Søreide
Proc. ASME. OMAE2012, Volume 3: Pipeline and Riser Technology, 717-723, July 1–6, 2012
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2012-83859
https://doi.org/10.1115/OMAE2012-83859
View Paper titled, Evaluation of Pipeline Impact Damage
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Topics: Damage, Pipelines, Deformation, Kinetic energy, Ocean engineering, Deflection, Design, Energy dissipation, Finite element analysis, Piping design
Proceedings Papers

Finite Element Analysis of Flexible Riser Impact

Hagbart S. Alsos, Bogi Laksa´foss, Per D. Rasmussen, Claus Kristensen, Gunnar Paulsen
Proc. ASME. OMAE2010, 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 5, Parts A and B, 741-749, June 6–11, 2010
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2010-20777
https://doi.org/10.1115/OMAE2010-20777
View Paper titled, Finite Element Analysis of Flexible Riser Impact
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Topics: Finite element analysis, Flexible risers, Pipeline risers, Risers (Casting), Deformation, Pipes, Armor, Ocean engineering, Computer software, Damage
Proceedings Papers

On the Ductile Response of Stiffened Panels Subjected to Lateral Indentation: Experimental and Numerical Analysis

Hagbart S. Alsos, Jo̸rgen Amdahl
Proc. ASME. OMAE2010, 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 2, 575-583, June 6–11, 2010
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2010-20788
https://doi.org/10.1115/OMAE2010-20788
View Paper titled, On the Ductile Response of Stiffened Panels Subjected to Lateral Indentation: Experimental and Numerical Analysis
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Topics: Collisions (Physics), Deformation, Dimensions, Ductile fracture, Engineering simulation, Explosions, Failure, Finite element analysis, Fracture (Materials), Fracture (Process)
Proceedings Papers

Analysis of Bottom Damage Caused by Ship Grounding

Hagbart S. Alsos, Jo̸rgen Amdahl
Proc. ASME. OMAE2008, Volume 2: Structures, Safety and Reliability, 829-836, June 15–20, 2008
Publisher: American Society of Mechanical Engineers
Paper No: OMAE2008-57868
https://doi.org/10.1115/OMAE2008-57868
View Paper titled, Analysis of Bottom Damage Caused by Ship Grounding
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Topics: Damage, Fracture (Materials), Hull, Ships, Computer simulation, Rupture, Seabed, Shapes, Simulation, Tankers