RESEARCH PAPERS: Offshore Mechanics

Foundation Safety of Gravity-Based Systems During Severe Storms

[+] Author and Article Information
K. O. Ronold

Det norske Veritas, Hovik, Norway

S. Haver

STATOIL, Stavanger, Norway

J. Offshore Mech. Arct. Eng 114(2), 104-113 (May 01, 1992) (10 pages) doi:10.1115/1.2919957 History: Received October 11, 1991; Online June 12, 2008


The temporal evolutions of the most important sea state characteristics during storms are presented together with the corresponding uncertainties. Storm data from the Northern North Sea are used for this purpose. The influence of the uncertainties associated with an extreme storm on the foundation safety is demonstrated for a gravity-based structural system founded on a clay. The stability is analyzed with respect to failure in large cyclic displacements accumulated during the storm. The failure probability is estimated by a first-order reliability method and the most important variables concerning their contribution to the failure probability are indicated. In most practical foundation safety investigations, an idealized deterministic storm profile is adopted. The adequacy of this profile is considered by calibrating a “load factor” to be used in connection with the idealized profile.

Copyright © 1992 by The American Society of Mechanical Engineers
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