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The Effect of the Member Thickness of the Platform Jacket on the Strength and Fatigue Life: Case Study of the Four-Legged Jacket Offshore Platform

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Abstract:

Offshore platforms are marine buildings commonly used for oil and gas exploitation activities. In general, reported failures in the life of offshore structures are fatigue failures resulting from environmental factors, such as random and continuous wave loads. In addition to environmental factors, the determination of the dimensions and thickness of the structure also plays an important role in increasing its strength. This study used Finite Element software with in-place analysis to calculate the strength and deterministic fatigue method for fatigue life analysis. This study aims to analyze the effect of the thickness of the jacket structure members on the strength and fatigue life. The results of the analysis showed that there was an increase in maximum UC and a decrease in fatigue life due to a reduction in thickness in the jacket members, where the initial model had a maximum UC of 0.64 with a fatigue life of 1285.83 years, while the 10% thickness reduction had a UC of 0.71 with a fatigue life of 552.07 years, a thickness reduction of 20% had a UC of 0.79 with a fatigue life of 213.80 years, a thickness reduction of 30% had a UC of 0.90 with a fatigue life of 62.14 years and a thickness reduction of 40% had a UC of 1.04 with a fatigue life 14.71 years. This research is expected to be a reference in designing the jacket structure to determine the optimal dimensions according to the planned fatigue life.

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Periodical:

Key Engineering Materials (Volume 1053)

Pages:

131-139

DOI:

https://doi.org/10.4028/p-ORZr67

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Online since:

May 2026

Authors:

Anwar Anwar*, Rudi Walujo Prastianto, Daniel M. Rosyid

Keywords:

Fatigue Life, FEM, In-Place Analysis, Jacket Platform, UC

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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* - Corresponding Author

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