NDLI: Determining Appropriate Stiffness Levels for Spudcan Foundations Using Jack-Up Case Records

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cassidy, M. J. Houlsby, G. T. Hoyle, M. Marcom, M. R.
Copyright Year	2002
Abstract	The level of soil stiffness under spudcan footings is an area of intense interest and debate, with many practitioners believing that current jack-up assessment guidelines are overly conservative. In order to evaluate appropriate stiffness parameters, back-analysis of case records of jack-up platforms in the North Sea has been performed. The records relate to three different rigs at a total of eight locations, which include a variety of soil conditions, water depths and sea-state severity. For each site the horizontal deck displacements and the sea-state conditions under storm loading are available. Numerical simulation of the platforms under storm loading was undertaken with varying levels of foundation stiffness. For each set of stiffness one-hour of numerical simulation was performed, with the most severe recorded environmental loading conditions for that site used. The horizontal deck displacements of the measured data and the numerical simulation results have been compared in both the frequency domain and by the magnitude of response. On the basis of the analyses, recommendations can be made for higher stiffness factors then are currently suggested in the SNAME, 1997 Technical & Research Bulletin 5-5A, Site Specific Assessment of Mobile Jack-up Units (SNAME, 1997).
Sponsorship	Ocean, Offshore, and Arctic Engineering Division
Starting Page	307
Ending Page	318
Page Count	12
File Format	PDF
ISBN	0791836142
DOI	10.1115/OMAE2002-28085
e-ISBN	0791835995
Volume Number	21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 4
Conference Proceedings	ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2002-06-23
Publisher Place	Oslo, Norway
Access Restriction	Subscribed
Subject Keyword	Water Seas Storms Footings (construction) Computer simulation Soil Stiffness North sea Jack-up drilling rigs
Content Type	Text
Resource Type	Article

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