Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/83689
Title: Fatigue reliability analysis of a steel catenary riser at the touchdown point incorporating soil model uncertainties
Authors: Li, Feng Zi.
Low, Ying Min.
Keywords: DRNTU::Engineering::Civil engineering
Issue Date: 2012
Source: Li, F. Z.,& Low, Y. M. (2012). Fatigue reliability analysis of a steel catenary riser at the touchdown point incorporating soil model uncertainties. Applied Ocean Research, 38, 100-110.
Series/Report no.: Applied ocean research
Abstract: Fatigue design of a steel catenary riser (SCR) at the touchdown point is a challenging problem. The touchdown point attracts the worst bending stresses and is subject to the greatest uncertainties, such as those arising from the riser-seabed contact. Design codes typically recommend generic safety factors on the design life, but the heightened uncertainty renders the use of such safety factors questionable. This paper addresses these uncertainties through a systematic reliability analysis. A sensitivity study is first conducted to select the most critical random variables. The soil model uncertainties are characterized by three variables representing stiffness, suction and trench. The efficient first-order reliability method (FORM) is used in conjunction with the response surface method to estimate the failure probability without considering soil uncertainties. Subsequently, an inverse-FORM (IFORM) analysis is performed to determine the alteration of the safety factor for the same level of reliability, when the soil variables are incorporated. A simple method is described to estimate the probability density of the fatigue life. This work reveals, among other things, that the soil uncertainties significantly influence the SCR fatigue reliability, and that FORM and IFORM are fairly accurate when compared against Monte Carlo simulation.
URI: https://hdl.handle.net/10356/83689
http://hdl.handle.net/10220/12525
ISSN: 0141-1187
DOI: 10.1016/j.apor.2012.07.005
Schools: School of Civil and Environmental Engineering 
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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