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Structural Engineering and Mechanics Volume 53, Number 5, March10 2015 , pages 881-896 DOI: https://doi.org/10.12989/sem.2015.53.5.881 |
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Fatigue performance of deepwater SCR under short-term VIV considering various S-N curves |
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D.K. Kim, H.S. Choi, C.S. Shin, M.S. Liew, S.Y. Yu and K.S. Park
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| Abstract | ||
| In this study, a method for fatigue performance estimation of deepwater steel catenary riser (SCR) under short-term vortex-induced vibration was investigated for selected S-N curves. General tendency between S-N curve capacity and fatigue performance was analysed. SCRs are generally used to transport produced oil and gas or to export separated oil and gas, and are exposed to various environmental loads in terms of current, wave, wind and others. Current is closely related with VIV and it affects fatigue life of riser structures significantly. In this regards, the process of appropriate S-N curve selection was performed in the initial design stage based on the scale of fabrication-related initial imperfections such as welding, hot spot, crack, stress concentration factor, and others. To draw the general tendency, the effects of stress concentration factor (SCF), S-N curve type, current profile, and three different sizes of SCRs were considered, and the relationship between S-N curve capacity and short-term VIV fatigue performance of SCR was derived. In case of S-N curve selection, DNV (2012) guideline was adopted and four different current profiles of the Gulf of Mexico (normal condition and Hurricane condition) and Brazil (Amazon basin and Campos basin) were considered. The obtained results will be useful to select the S-N curve for deepwater SCRs and also to understand the relationship between S-N curve capacity and short-term VIV fatigue performance of deepwater SCRs. | ||
| Key Words | ||
| S-N curve; steel catenary riser (SCR); vortex-induced vibration (VIV); offshore riser engineering, riser fatigue | ||
| Address | ||
| D.K. Kim: Civil Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Perak, Malaysia H.S. Choi: Graduate School of Engineering Mastership, Pohang University of Science and Technology, Pohang, Republic of Korea C.S. Shin: Graduate School of Engineering Mastership, Pohang University of Science and Technology, Pohang, Republic of Korea M.S. Liew: Faculty of Geoscience and Petroleum Engineering, Universiti Teknologi PETRONAS, Bandar Seri Iskandar, Perak, Malaysia S.Y. Yu: Deepwater Technology Mission Oriented Research, Universiti Teknologi PETORNAS, Bandar Seri Iskandar, Perak, Malaysia K.S. Park: Steel Business Division, POSCO, Seoul, Republic of Korea | ||