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TECHNICAL PAPERS

Probabilistic Modeling and Analysis of Riser Collision

[+] Author and Article Information
Bernt J. Leira

NTNU Department of Marine Structures, Faculty of Marine Technology, N-7491 Trondheim, Norwaye-mail: Bernt.Leira@marin.ntnu.no

Tore Holmås

SINTEF Group, Marintek, N-7491 Trondheim, Norway

Kjell Herfjord

Norsk Hydro Research Centre, N-5020 Bergen, Norway

J. Offshore Mech. Arct. Eng 124(3), 132-138 (Aug 01, 2002) (7 pages) doi:10.1115/1.1490379 History: Received July 01, 2001; Revised December 01, 2001; Online August 01, 2002
Copyright © 2002 by ASME
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References

Søreide, T., Amdahl, J., Eberg, E., Holmås, T. and Hellan, O̸., 1988, “Ultimate Strength of Offshore Structures, Theory Manual,” SINTEF Report F88038.
Sagatun, S. I., Herfjord, K., and Holmås, T., “Dynamic Simulation of Marine Risers Moving Relative to Each Other due to Vortex and Wake Effects,” J. Fluids Struct., (to appear).

Figures

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Surface-Surface contact search in FEM model
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Case study riser configuration
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Stress history; current velocity is 1.3 m/s.
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Max impact speed with depth, current velocity is 1.3 m/s.
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Accumulated damage along riser; current velocity is 1.3 m/s.
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Probability density of impact stress; current velocity is 1.3 m/s.
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Stress history; current velocity is 1.5 m/s.
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Max impact speed with depth; current velocity is 1.5 m/s.
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Accumulated damage along riser
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Probability density of impact stress; current velocity is 1.5 m/s.
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Stress History; current velocity is 1.7 m/s.
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Maximum impact velocity with depth; current velocity is 1.7 m/s.
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Accumulated damage versus depth; current velocity is 1.7 m/s.
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Probability density of stress; current velocity is 1.7 m/s.
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Stress history; Top tension is 1.8 MN, current velocity is 1.7 m/s.
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Max impact speed with depth
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Accumulated damage along the riser
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Probability density of maximum stress; TTR is 2.25.
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Stress History; motion amplitude is 5m.
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Max impact speed with depth; motion amplitude is 5m.
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Accumulated damage along the riser; motion amplitude is 5m.
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Probability density of maximum stress; motion amplitude is 5m.

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