Journal of Shanghai Jiaotong University ›› 2011, Vol. 45 ›› Issue (04): 585-589.

• Ocean Engineering • Previous Articles     Next Articles

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

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