Abstract A large-scale model test of a truncated steel catenary riser (SCR) was performed in an ocean basin to investigate the riser responses under pure steady uniform current and pure vessel motions separately. Out-of-plane vortex-induced vibration (VIV) was confirmed to have occurred under both test conditions. A comparative analysis and discussion were carried out on selected cases in terms of out-of-plane VIV responses, VIV developing mechanisms and the fatigue damage contribution. Results indicate that both steady current-induced and vessel motion-induced VIV responses are dominated by strong travelling waves, but vessel motion-induced VIV responses are more ‘intermittent’ with respect to the response amplitude and frequency owing to its space- and time-varying shedding frequency. ‘Power-in’ regions are further estimated to understand the VIV developing mechanisms for both test conditions. Finally, fatigue damages are evaluated showing the damage by vessel motion-induced VIV is comparable and at the same level as uniform current-induced VIV, which highlights the great importance of vessel motion-induced VIV, which cannot be neglected in the design and analysis for SCR systems.

中文翻译：

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钢悬链线立管在恒流和船舶运动引起的振荡流中涡激振动的评价

摘要 为研究在纯稳定均匀水流和纯船舶运动下立管的响应，在海盆中进行了截断钢悬链线立管（SCR）的大型模型试验。确认在两种测试条件下都发生了平面外涡激振动 (VIV)。从面外VIV响应、VIV发展机制和疲劳损伤贡献方面对选定的案例进行了比较分析和讨论。结果表明，稳定电流引起的和血管运动引起的 VIV 响应均以强行波为主，但由于其空间和时间，血管运动引起的 VIV 响应在响应幅度和频率方面更具“间歇性”变化的脱落频率。进一步估计“上电”区域以了解两种测试条件下的 VIV 开发机制。最后，对疲劳损伤进行了评估，表明船舶运动引起的 VIV 的损伤与均匀电流引起的 VIV 具有可比性并处于同一水平，这突出了船舶运动引起的 VIV 的重要性，这在设计和分析中不可忽视用于 SCR 系统。