TECHNICAL PAPERS
Nov 1, 1989
Model Tests of Gravity Platforms. I: Description
Authors: Rune Dyvik, Knut H. Andersen, Member, ASCE, Christian Madshus, and Tomm AmundsenAuthor Affiliations
Publication: Journal of Geotechnical Engineering
Volume 115, Issue 11
Abstract
Five model tests were performed to qualify the concept of a monobase gravity platform for the Troll Field in the North Sea. These tests were designed to simulate the conditions for a platform situated in deep water and on soft clay. The program included one static, one static after cyclic, and three cyclic model tests. A description of the procedures and selected test results are presented. The results provide a basis for a critical evaluation of the foundation design procedures presently used for offshore gravity structures in the North Sea. The results indicate that cyclic loading results in a reduced static bearing capacity, cyclic bearing capacity is lower than static bearing capacity, the cyclic stiffness, decreases with number of cycles, and for the relatively large moment arms employed, cyclic rotation is the dominant displacement mode. The results also show that for the conditions of these tests, design storm compositions with the largest cyclic load first, followed by decreasing cyclic loads, may be more critical than the traditional design storm composition with increasing cyclic loads (largest load last).
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Reference
1.
Andersen, K. H., et al. (1989). “Model test of gravity platforms. I: Interpretation.” J. Geotech. Engrg., ASCE, 115(11), 1550–1568.
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Copyright © 1989 ASCE.
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Published online: Nov 1, 1989
Published in print: Nov 1989
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Rune Dyvik
Sr. Engr., Norwegian Geotech. Inst., P.O. Box 40 Taasen, 0801 Oslo 8, Norway
Knut H. Andersen, Member, ASCE
Section Head, Norwegian Geotech. Inst., 0801 Oslo 8, Norway
Christian Madshus
Sr. Engr., Norwegian Geotech. Inst., 0801 Oslo 8, Norway
Tomm Amundsen
Sr. Engr., Norsk Hydro A/S, P.O. Box 200, 1321 Stabekk, Norway
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