Fatigue Characteristic Analysis of Deepwater Steel Catenary Risers at the Touchdown Point |
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| Authors: | FU Jun-jie YANG He-zhen |
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| Institution: | [1]State Key Laboratory of Ocean Engineering, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong Univershy, Shanghai 200240, China [2]Ningbo Maritime Safety Administration of China, Ningbo 315000, China |
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| Abstract: | This paper presents fatigue characteristic analysis of a deepwater steel catenary riser (SCR) under ambient excitations. The SCR involves complex nonlinear dynamic behaviors, especially at the touchdown point (TOP) where the riser first touches the seafloor. Owing to the significant interaction with soil, the touchdown zone is difficult to be modeled. Based on Lumped-Mass method and P-y curve, nonlinear springs are used to simulate the SCR-seabed coupled interaction. In case studies, an SCR's dynamic features have been obtained by transient analysis and the structure fatigue assessment has been carried out by S-N approach. The comparative analysis shows that the TOP is the key location where soil-riser interaction rises steeply and minimum fatigue life occurs. Parameters such as ocean environment loads, vessel motions, riser material and geometric parameters are discussed. The results indicate that the vessel motion is the principal factor for the structure fatigue lite distribution. |
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| Keywords: | steel catenary riser touchdown point fatigue analysis dynamic response nonlinear spring |
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