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中文摘要：
运用二维环模型模拟管道，采用非线性离散弹簧模型模拟了管道外壁与扣入式止屈器内壁之间的接触．建立了其结构的弹塑性本构关系，构建了海底管道二维屈曲接触力学模型，研究分析了海底管道在屈曲和管壁接触过程中的承载力、结构变形以及截面应力分布等的变化规律．为了验证该理论分析方法的准确性，将理论分析结果与ABAQUS软件的模拟结果进行了对比，结果吻合良好；最后，将理论计算得到的屈曲压溃压力和屈曲传播压力分别与ABAQUS软件模拟结果及全比例管道屈曲试验进行了对比，证明了该理论方法的可靠性．该理论研究为进一步研究管道的屈曲传播力学机制和止屈技术奠定了基础．
英文摘要：
In order to research the mechanism in subsea pipelines,a two-dimensional ring model is used to represent the discussed pipe and a nonlinear discrete spring model is adopted to simulate contact between the outer wall of the pipe and the inner wall of the slip-on arrestor during the process of buckling propagation.The variation of bearing capacity,structure deformation and stress distribution of pipelines is studied based on an elastoplastic constitutive relationship of two-dimensional buckling and contacting mechanics model.Comparison between theoretical and ABAQUS results is presented to verify the accuracy of the analysis model.Comparisons among theoretical results,ABAQUS simulations and full-scale model experiment results of pipeline collapse pressure and propagation pressure are made to verify the reliability of the theory above.Further research could be achieved based on the theory discussed in this paper.
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