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Influence of trench geometry on fatigue response of steel catenary risers by using a boundary layer solution on a sloped seabed
Ocean Engineering ( IF 5 ) Pub Date : 2020-12-30 , DOI: 10.1016/j.oceaneng.2020.108447
Rahim Shoghi , Celso P. Pesce , Hodjat Shiri

Previous studies have shown that the geometry of the trench affects the fatigue response of steel catenary risers (SCR). Fatigue performance of SCR in the touchdown zone (TDZ) has been investigated in several studies, sometimes leading to contradictory results, with no coherent agreement regarding if the effect of the trench on fatigue performance of SCR would be beneficial or detrimental. This paper aims at developing a model based on the well-known boundary layer method (BLM) to capture the trench effect on the fatigue performance of SCR. Using analytical and numerical approaches, a meaningful relationship was observed between the slope of trench shoulders, the magnitude of the peak fatigue damage, and its location in the trench. It was also observed that the effect of trench formation on the fatigue performance of SCR could be predicted by using TDP oscillations on a sloped seabed. The study contributes to achieving a coherent agreement about the trench effect on fatigue.



中文翻译:

斜面海床边界层解法对沟槽结构对悬链线钢疲劳响应的影响

先前的研究表明,沟槽的几何形状会影响悬链线钢(SCR)的疲劳响应。在几项研究中已经对SCR在着陆区(TDZ)的疲劳性能进行了研究,有时会得出相互矛盾的结果,关于沟槽对SCR疲劳性能的影响是有益还是有害,没有一致的意见。本文旨在建立基于众所周知的边界层方法(BLM)的模型,以捕捉沟槽对SCR疲劳性能的影响。使用分析和数值方法,在沟槽肩部的斜率,峰值疲劳损伤的大小及其在沟槽中的位置之间观察到有意义的关系。还观察到,可以通过在倾斜海床上使用TDP振荡来预测沟槽形成对SCR疲劳性能的影响。该研究有助于就沟槽对疲劳的影响达成一致的共识。

更新日期:2020-12-31
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