Fatigue analysis of the bow structure of FPSO

Zhi-qiang Hu; Zhen Gao; Yong-ning Gu

doi:10.1007/BF02935569

Journal of Marine Science and Application ›› 2003, Vol. 2 ›› Issue (1) : 11 -18. DOI: 10.1007/BF02935569

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Fatigue analysis of the bow structure of FPSO

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Abstract

The bow structure of FPSO moored by the single mooring system is rather complicated. There are many potential hot spots in connection parts of structures between the mooring support frame and the forecastle. Mooring forces, which are induced by wave excitation and transferred by the YOKE and the mooring support frame, may cause fatigue damage to the bow structure. Different from direct wave-induced-forces, the mooring force consists of wave frequency force (WF) and 2nd draft low frequency force (LF)^[3], which are represented by two sets of short-term distribution respectively. Based on two sets of short-term distribution of mooring forces obtained by the model test, the fatigue damage of the bow structure of FPSO is analyzed, with emphasis on two points. One is the procedure and position selection for fatigue check, and the other is the application of new formulae for the calculation of accumulative fatigue damage caused by two sets of short-term distribution of hot spot stress range. From the results distinguished features of fatigue damage to the FPSO’s bow structure can be observed.

Keywords

FPSO / structural fatigue / single mooring system / hot spot stress / accumulated fatigue damage

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Zhi-qiang Hu, Zhen Gao, Yong-ning Gu. Fatigue analysis of the bow structure of FPSO. Journal of Marine Science and Application, 2003, 2(1): 11-18 DOI:10.1007/BF02935569

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References

Publishing order | Descend order by publishing year | Descend order by cited within

[1]	DNV. Fatigue assessment of ship structures[M]. Classification Note, No. 30.7, 1998.

[2]	DNV. Offshore standard[M]. OS-E 301 Ch. 2, Sec. 2, 2001.

[3]	Hu Yu-ren, Chen Bo-zhen. The structural fatigue reliability analysis of ship and ocean engineering[M]. 1996, Beijing: People’s Communications Publishing House, (in Chinese)

[4]	LR. Shipright fatigue design assessment procedure[M]. Structural detail design guide[C]. 1996.

[5]	Hu Zhi-qiang, Gu Yong-ning. Fatigue analysis of flare tower of an offshore floating production and storage Unit [J]. China offshore Oil and Gas (Engingineering), 2001, 13(3): 1418-1418

[6]	Liu Jian-cheng, Gu Yongning. Assessment of fatigue strength of an offshore floating production and storage unit [J]. China Ocean Engineering, 2002, 16(1): 41-49