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Ocean Systems Engineering
  Volume 5, Number 2, June 2015, pages 77-89

A finite element analysis for unbonded flexible risers under bending loads
Chen Xiqia, Fu Shixiao, Gao Yun and Du Xiaying

    As the exploitation of oil and gas resources advances into deeper waters and harsher environments, the design and analysis of the flexible risers has become the research focus in the offshore engineering filed. Due to the complexity of the components and the sliding between the adjacent layers, the bending response of the flexible risers is highly non-linear. This paper presents the finite element analysis of the flexible risers under bending loads. The detailed finite element model of the flexible riser is established in ABAQUS software. This finite element model incorporates all the fine details of the riser to accurately predict its nonlinear structural behavior. Based on the finite element model, the bending moment–curvature relationships of a flexible riser under various axisymmetric loads have been investigated. The results have been compared with the analytical ones obtained from the literature and good agreements have been found. Moreover, the stress of the tendon armors has been studied. The non-linear relationship between the armor tendons\' stress and the bending loads has been obtained.
Key Words
    flexible risers; finite element model; non-linear; bending loads; axisymmetric loads; stress
Chen Xiqia and Du Xiaying: Tianjin Branch, CNOOC Ltd, Tianjin, China
Fu Shixiao: State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China
Gao Yun: 3State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, China

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