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RESEARCH PAPERS: Offshore Mechanics

Optimum Waterline Geometry for Deepwater Platforms

[+] Author and Article Information
S. Y. Hanna

Conoco, Inc., Houston, TX 77252

J. Offshore Mech. Arct. Eng 111(3), 177-182 (Aug 01, 1989) (6 pages) doi:10.1115/1.3257145 History: Received January 01, 1987; Revised December 14, 1988; Online October 30, 2009

Abstract

The dynamic behavior of deepwater platforms can be improved by maximizing wave force cancellation at their natural frequencies of interest. This can be achieved by optimizing both the platform waterline geometry, and the structural dynamic characteristics. This study outlines a simplified procedure by which different water-line geometries for deepwater structures can be evaluated. This procedure considers effect of wave directionality. Comparison between different waterline geometries is performed. Results are presented for four, six, eight, sixteen-column, or leg, configurations, as well as for columns (or legs) located in Triangle, Pentagon, and Hexagon configurations. For each configuration, reduction in the external loading as a function of frequency is quantified. Procedures and results presented in this paper can be easily used in selecting optimum platform waterline geometry, leg spacings, and conductor locations in early design stages.

Copyright © 1989 by ASME
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