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Fatigue Sensitivity Analysis of Steel Catenary Riser near Touchdown Point 被引量:1

Fatigue Sensitivity Analysis of Steel Catenary Riser near Touchdown Point
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摘要 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. © 2017, Shanghai Jiaotong University and Springer-Verlag GmbH Germany. 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.
出处 《Journal of Shanghai Jiaotong university(Science)》 EI 2017年第5期570-576,共7页 上海交通大学学报(英文版)
基金 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)
关键词 Fatigue of materials HYSTERESIS Magnetic disk storage Marine risers Ocean currents Overhead lines Sensitivity analysis STIFFNESS 触地点;疲劳敏感;海床沟;hysteretic 海床模型;
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