Findings From a Joint Industry Study on Foundation Fixity of Jackup Units

by J.J. Osborne, Noble Denton Consultancy Services Ltd.,
J.C. Trickey, Noble Denton Consultancy Services Ltd.,
G.T. Houlsby, University of Oxford,
R.G. James, Cambridge University,

Part of: Offshore Technology in Civil Engineering: Hall of Fame Papers


During the design storm conditions the soil supporting jack-up unit footings may be close to, or at plastic failure. Accordingly, the use of elastic solutions to the problems of foundation load response during load conditions which approach the ultimate design conditions are inappropriate. The rotational restraint, or moment fixity, offered by the footings under these conditions will reduce the moment load seen in the lower leg guides. Because of the lack of knowledge relating to this subject an industry sponsored research project was conducted. This paper briefly presents the study conclusions.

Copyright holder: Copyright 1991, Offshore Technology Conference

Subject Headings: Foundation design | Load factors | Ultimate loads | Plastic design | Moment (mechanics) | Industries | Footings


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