Modeling touchdown point oscillation and its relationship with fatigue response of steel catenary risers |
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| Institution: | 1. Laboratory of Analysis and Reliability of Offshore Structures, Civil Engineering Department, COPPE/Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;2. CENPES/PETROBRAS, Rio de Janeiro, Brazil;1. Department of Structural and Geotechnical Engineering, Polytechnic School at University of São Paulo, São Paulo, SP, Brazil;2. Department of Naval Arch. and Ocean Engineering, Polytechnic School at University of São Paulo, São Paulo, SP, Brazil;1. College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, UK;2. Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK;1. SEISMIC Ingeniería y Construcción, S.A. de C.V., Insurgentes Sur #885, Primer Piso, Col. Nápoles, 03810 Mexico City, Mexico;2. Instituto Mexicano del Petróleo, Eje Central Lazaro Cardenas 152, Col. San Bartolo Atepehuacan, 07730 Mexico City, Mexico;3. Universidad de Colima, Facultad de Ingeniería, km. 9 carretera Colima-Coquimatlán Coquimatlán, 28400 Colima, Mexico;1. College of Safety and Ocean Engineering, China University of Petroleum, Beijing, 102249, China;2. School of Naval Architecture, Ocean, and Civil Engineering, State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China |
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| Abstract: | The riser-seabed interaction resulting in a trench formed in the touchdown zone (TDZ) of steel catenary risers (SCR) has a significant influence on accumulated fatigue damage. Several studies have used different trench modeling approaches to investigate the trench effect on fatigue. However, contradictory observations have been reported with no coherent agreement on the beneficial or detrimental effect of the trench on fatigue. In this study, the significance of trench geometry in fatigue damage evaluation was investigated. Using analytical and numerical approaches, a meaningful relationship was observed between the trench slope in different zones and the peak fatigue damage. A new set of rules was proposed for the qualitative assessment of the overall trend of trench effect on the variation of fatigue damage. The proposed assessment rules were validated by performing comprehensive numerical fatigue analysis. A comparison with samples of published experimental and numerical studies was also completed. It was observed that depending on the direction of the low-frequency vessel excursions, the peak fatigue damage may increase towards the near offsets and decrease towards the far vessel offset. This implied that the case dependency of the trench effect on fatigue response in different geographical locations with various environmental loads was a potential source for the contradictory results reported in previously published studies. |
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| Keywords: | Steel catenary risers Riser-seabed interaction Touchdown point Trench profile Fatigue response |
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