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

Abstract

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

WANG Kun-Peng, XUE Hong-Xiang, TANG Wen-Yong. Dynamic Response Analysis of Deepwater Steel Catenary Riser Based on the Seabed-Suction and Stiffness-Degradation Model[J]. Journal of Shanghai Jiaotong University, 2011, 45(04): 585-589.

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