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Fatigue Analysis of the Typhoon TLP Large Diameter SCR

机译：台风TLP大口径SCR的疲劳分析

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This paper details the challenges faced in the design of the Typhoon 18 inch gas export steel catenary riser.rnThe combination of large diameter with the relatively shallow water depth resulted in significant fatiguerndamage at the touch down point. In Section I, the initial design steps for the Typhoon riser are presented.rnIncluded are several analysis refinements and design changes that were investigated in an attempt tornimprove fatigue life. Section II focuses on a refined touch down point analysis including soil-structurerninteraction effects. This analysis showed that the riser was too light and the soil interaction effects were toornweak to significantly reduce fatigue damage. Section III presents a new and unique aspect to this project:rnthe measurement and calculation of increased drag coefficients for use in the straked region of the riserrnoperating in the smallest and most damaging fatigue sea-states. The use of increased hydrodynamicrndamping afforded by the strakes under relevant operating conditions significantly reduced riser responsernand increased fatigue life. To the best of the authors' knowledge, this is the first use of straked pipernenhanced drag coefficients as applied to deepwater riser design. This new hydrodynamic data was obtainedrnthrough model tests at MIT.
机译：本文详细介绍了台风18英寸输气钢悬链冒口的设计面临的挑战。大直径与相对浅水深度的结合导致着陆点的明显疲劳损伤。在第一部分中，介绍了台风冒口的初始设计步骤。其中包括一些分析改进和设计更改，旨在提高疲劳寿命。第二部分着重于精细的降落点分析，包括土壤-结构相互作用的影响。该分析表明，立管太轻，土壤相互作用弱到可以显着减少疲劳损伤的程度。第三节为该项目提出了一个新的独特方面：增加阻力系数的测量和计算，以用于在最小和最具破坏性的疲劳海域中穿过立管的行程区域。在相关的运行条件下，由板条提供的增加的流体动力学阻尼的使用显着降低了立管响应，并延长了疲劳寿命。据作者所知，这是首次将行程管形增强阻力系数应用于深水立管设计。这些新的水动力数据是通过麻省理工学院的模型测试获得的。

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