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Research Papers

Global Structural Loads Induced by Abnormal Waves and Design Storms on a FPSO

[+] Author and Article Information
Nuno Fonseca

Centre for Marine Technology and Engineering,  Technical University of Lisbon, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisboa, Portugalnfonseca@mar.ist.utl.pt

Ricardo Pascoal

Centre for Marine Technology and Engineering,  Technical University of Lisbon, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisboa, Portugalrpascoal@mar.ist.utl.pt

C. Guedes Soares

Centre for Marine Technology and Engineering,  Technical University of Lisbon, Instituto Superior Técnico, Avenida Rovisco Pais, 1049-001 Lisboa, Portugalguedess@mar.ist.utl.pt

J. Offshore Mech. Arct. Eng 130(2), 021005 (Jun 06, 2008) (9 pages) doi:10.1115/1.2779334 History: Received November 02, 2006; Revised July 10, 2007; Published June 06, 2008

The structural loads on a floating production, storage, and offloading platform induced by a large set of realistic (measured) abnormal waves are compared with the loads induced by “design storms” and also with the minimum values required by Classification Society rules. The design storms have a duration of 3h and correspond to the 100yr contour of the scatter diagram of the Northern North Sea. Time domain simulations are performed with a time domain seakeeping program that accounts for the most important nonlinear effects. The results are analyzed to obtain probability distributions of the sagging and hogging peaks of the vertical bending moment. Several theoretical distributions are fitted to the simulated realizations.

Copyright © 2008 by American Society of Mechanical Engineers
Topics: Stress , Waves , Design , FPSO , Storms , Seas
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References

Figures

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Figure 2

Midship vertical bending moment RAO

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Figure 7

Hogging bending moment for Hs13m, Tp13s

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Figure 9

Hogging bending moment for Hs14.5m, Tp16.0s

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Figure 10

Sagging bending moment for Hs13m, Tp18s

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Figure 11

Hogging bending moment for Hs13m, Tp18s

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Figure 12

Sagging for all simulated sea states (fitted Weibull)

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Figure 13

Hogging for all simulated sea states (fitted Weibull)

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Figure 14

Wave spectrum, wave-VBM cross-spectrum modulus, coherence, and VBM transfer function modulus

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Figure 15

VBM in response to abnormal waves along with probabilities of exceedance in 3h duration, 100yr return period, sea states

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Figure 4

Environmental contour line Northern North Sea (from Winterstein (15)).

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Figure 5

30min simulation of the wave elevation at midship, relative motion at the forward perpendicular, and vertical bending moment at midship (Hs=14.5m and Tp=16.0s)

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Figure 6

Sagging bending moment for Hs13m, Tp13s

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Figure 3

Bending moment standard deviation

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Figure 8

Sagging bending moment for Hs14.5m, Tp16.0s

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Figure 16

Wave sequence that induces the largest vertical bending moment at midship for the sea state with Hs=14.5m, Tp=16.0s

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