Spectral fatigue analysis of shallow water jacket platforms

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:194730

Bishop, N W.M.; Feng, Q ^[1]; Schofield, P ^[2]; Kirkwood, M G; Turner, T ^[3]

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1. University Coll., London (United Kingdom). Dept. of Mechanical Engineering
2. WS Atkins Consultants Ltd., Epsom (United Kingdom)
3. British Gas PLC, Newcastle upon Tyne (United Kingdom)

The spectral analysis approach is a very elegant and computationally efficient method of analyzing the fatigue life of offshore jacket platforms. The primary limitation of the approach is that it assumes linearity of both the structural system and the wave loading mechanism. The approach is now widely used for the analysis of deepwater, dynamically responsive platforms where non-linearities are usually not serious. The new approach provides a better method for choosing the appropriate height of each so called base wave case. This paper presents the results obtained using this new approach, as well as comparative results obtained using the deterministic, spectral and time domain approaches applied with a representative sea state. The results show that the deterministic-spectral method has a considerable amount of potential, especially for new design work where weight savings and/or increased confidence levels may be achieved.

• OSTI ID: 194730
• Report Number(s): CONF-950695--; ISBN 0-7918-1307-X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
FATIGUE
MATHEMATICAL MODELS
MEASURING METHODS
OFFSHORE PLATFORMS
RESPONSE FUNCTIONS
SUPPORTS
TIME-SERIES ANALYSIS
WATER WAVES
WAVE FORCES