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Fatigue sensitivity analysis of steel catenary riser near touchdown point

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Abstract

By transforming the platform response obtained from coupled hydrodynamic analysis to the top motions of steel catenary riser (SCR), the nonlinear dynamic analysis of the SCR is carried out in Abaqus/Aqua. In this analysis, the SCR-seabed interaction is well taken into account by introducing the seabed trench model and hysteretic seabed model. The fatigue damage of the SCR near touchdown point (TDP) is calculated using rain-flow counting methodology, and the sensitivity of the fatigue damage to the seabed and wave parameters are investigated. The results indicate that as seabed stiffness increases, the fatigue life and its sensitivity to seabed stiffness decrease. Seabed trenching may benefit the fatigue life of the SCR and the trench position should be elaborated for realistic fatigue damage prediction. Due to the induced platform response, significant wave height and spectral peak period have significant effects on the fatigue damage, thus the short-term sea state bins should be carefully selected from the wave scatter diagram.

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Authors and Affiliations

  1. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, 212003, China

    Kunpeng Wang  (王坤鹏) & Chunyan Ji  (稽春艳)

  2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

    Hongxiang Xue  (薛鸿祥) & Wenyong Tang  (唐文勇)

Authors
  1. Kunpeng Wang  (王坤鹏)
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  2. Chunyan Ji  (稽春艳)
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  3. Hongxiang Xue  (薛鸿祥)
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  4. Wenyong Tang  (唐文勇)
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Corresponding author

Correspondence to Kunpeng Wang  (王坤鹏).

Additional information

Foundation item: the Natural Science Foundation of Jiangsu Province (No. BK20160557), the National Natural Science Foundation of China (Nos. 51579146, 51490674), Shanghai Rising-Star Program (No. 16QA1402300)

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Wang, K., Ji, C., Xue, H. et al. Fatigue sensitivity analysis of steel catenary riser near touchdown point. J. Shanghai Jiaotong Univ. (Sci.) 22, 570–576 (2017). https://doi.org/10.1007/s12204-017-1876-7

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  • DOI: https://doi.org/10.1007/s12204-017-1876-7

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