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TECHNICAL PAPERS

Dynamic Behavior and Optimization of Offshore Gravity Platforms

[+] Author and Article Information
Nicat S. Mastanzade

 Istanbul Kultur University, Department of Civil Engineering, E-5 Karayolu üzeri No:22, Sirinevler, Istanbul, Turkeyn.mestanzade@iku.edu.tr

Gökhan Yazici

 Istanbul Kultur University, Department of Civil Engineering, E-5 Karayolu üzeri No:22, Sirinevler, Istanbul, Turkeygokhanyazici@iku.edu.tr

J. Offshore Mech. Arct. Eng 127(2), 130-134 (Nov 17, 2004) (5 pages) doi:10.1115/1.1894411 History: Received March 01, 2004; Revised November 17, 2004

This paper presents the results of a dynamic investigation with the aim of determining both the optimal shape of an offshore gravity platform column and the required mass of the infill water. The natural frequency formulation of the structure with the added infill water mass, Er, was obtained by using Rayleigh’s method. Pontyagin’s maximum variational principle was used to define the shape of the column. An algorithm and a computer program were developed to obtain the numerical solution of the problem. Finally, a scaled model of the gravity platform was built and tested, in order to verify the results obtained from the analytical research and to determine the mass of the infill water.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 2

Design scheme of the gravity platform in the sea

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Figure 1

The gravity platform (a) and its dynamic design scheme (b)

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Figure 5

Scaled model of the gravity platform

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Figure 6

The distribution of the added water mass

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Figure 3

Optimum form of the offshore gravity platform

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Figure 4

Relationship between the optimum volume and the natural frequency

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