Abstract
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.
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