上海交通大学学报(自然版) ›› 2011, Vol. 45 ›› Issue (04): 585-589.

• 海洋工程 • 上一篇    下一篇

基于海床吸力和刚度衰减模型的深海钢悬链线立管动力响应分析

王坤鹏,薛鸿祥,唐文勇   

  1. (上海交通大学 海洋工程国家重点实验室,上海 200240)
  • 收稿日期:2010-10-29 出版日期:2011-04-29 发布日期:2011-04-29
  • 基金资助:

    国家科技重大专项资助项目(2008ZX0502600504),海洋工程国家重点实验室自主研究课题资助项目(GKZD010031)

Dynamic Response Analysis of Deepwater Steel Catenary Riser Based on the Seabed-Suction and Stiffness-Degradation Model

 WANG  Kun-Peng, XUE  Hong-Xiang, TANG  Wen-Yong   

  1. (State Key Laboratory of Ocean Engineering,Shanghai Jiaotong University,Shanghai 200240,China)
  • Received:2010-10-29 Online:2011-04-29 Published:2011-04-29

摘要: 运用ABAQUS创建触地单元,将立管海床作用的模拟简化为3种模型:线性刚度、线性截断、线性截断并考虑海床吸力和刚度衰减.将浮体垂向运动作为立管顶端边界输入,并对3种简化模型进行了计算比较.结果表明:考虑立管海床分离以及吸力效应对计算结果的影响很大;考虑吸力效应时,在立管和海床分离的阶段会有较多的疲劳应力循环.第③类触地单元较好地反映了吸力的产生和释放过程,其包含的海床刚度衰减模型也给出了令人满意的结果.

关键词:  , 钢悬链线立管, 立管-海床作用, 触地单元, 海床吸力, 刚度衰减

Abstract: A touch-seabed element was created in ABAQUS to simulate the soilriser interaction which is reduced to three models: linear stiffness, linear stiffness with soil-riser’s separateness, soilriser’s separateness and considering the suction and the degradation of the seabed. Considering the floater’s z-motion at the riser’s top boundary, the three models were analyzed and compared. The result shows that the soil-riser’s separateness and suction have great effect on the computation result. If the model considers the suction,there will be many stress cycles at the soil-riser separateness stage. The third touch-seabed element well shows the generation and release of suction, and the seabed stiffness degradation model included in it also gives satisfactory results.

Key words: steel catenary riser, soil-riser interaction, touch-seabed element, seafloor suction, stiffness degradation