Strength of Minimum Structure Platforms Under Ship Impact

[+] Author and Article Information
Gage S. Grewal

MMI Engineering Limited, Wilderspool Park, Greenall’s Avenue, Warrington, Cheshire, WA46HL, UK

Marcus M. K. Lee

School of Civil Engineering and the Environment, University of Southampton, Highfield, Southampton, SO17 1BJ, UKe-mail: mmkl@soton.ac.uk

J. Offshore Mech. Arct. Eng 126(4), 368-375 (Mar 07, 2005) (8 pages) doi:10.1115/1.1839883 History: Received August 26, 2003; Revised February 06, 2004; Online March 07, 2005
Copyright © 2004 by ASME
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Grewal, G. S., 2002, “Dynamic Response of Offshore Minimum Structures Subjected to Ship Impact,” Ph.D. thesis, University of Wales Swansea.
MSL, 1999, “JIP Comparative Evaluation of Minimum Structures and Jackets: Effect of Vessel Impact on Intact and Damaged Structures,” Doc Ref C209R007 Rev1, MSL Engineering Limited, Ascot, UK.
American Petroleum Institute, 1993, “Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Load and Resistance Factor Design,” 1st ed., API RP2A-LRFD.
Atkins, W. S., 2002, “Comparative Evaluation of Minimum Structures and Jackets,” HSE Books, Offshore Technology Report, 2001/062.
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BS7191, 1989, “Weldable Structural Steels for Fixed Offshore Structures,” British Standards Institution.
Furnes, O., and Amdahl, J., 1980, “Ship Collisions With Offshore Platforms,” Proceedings of INTERMARITEC Symposium, Hamburg.
Det Norske Veritas, 1981, “Load Impact From Boats,” DNV Technical Note TN A202.
Department of Energy, 1990, Offshore Installations: Guidance on Design, Construction and Certification, 4th ed., London, HMSO, pp. 15.6–15.7.
Atkins, 1999, Private communication with Navil Shetty and Jacek Gierlinski, WS Atkins Science and Technology, Epsom, Surrey, England.
Ricles,  J. M., Gillum,  T. E., and Lamport,  W., 1994, “Grout Repair of Dented Offshore Tubular Bracing—Experimental Behavior,” J. Struct. Eng., 120, No. 7.


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Platforms designed by Ramboll 4
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Finite element representation of ship collision (LAT: Lowest Astronomical Tide)
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True stress-plastic strain curve for steel member properties input
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Post-impact deformations of platforms—with foundations modeled
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Critical eigenmode of Vierendeel
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Postimpact deformations of platforms—with foundations excluded
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Critical eigenmode of Braced Caisson
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Dissipation of energy for the Caisson-ship collision
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Dissipation of energy for the Jacket-ship collision
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Dissipation of energy for the Monotower-ship collision
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Dissipation of energy for the Vierendeel-ship collision



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