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中文摘要：
对基于大挠度柔性梁理论的立管动力分析程序CABLE 3D改编,将原程序中立管受到线性海床的弹性支撑力扩充为立管受到的海床垂向力充分考虑管土非线性相互作用,使新程序中立管与海床土的相互作用遵循p-y曲线。采用伽辽金方法在空间内离散立管的动态方程,最终采用Newmark-β法进行时域内迭代求解。利用改编后的新程序分别研究了立管与线性海床土和非线性海床土相互作用的对比以及不同垂荡幅值情况下立管的动态响应。研究表明,非线性海床土能够更加准确地模拟真实的管土相互作用,触地点区域的节点会经历不同的管土相互作用过程。
英文摘要：
The riser dynamic analysis program CABLE 3D is reprogramed based on the theory of the flexible beam with large deflection. The original program in which the riser has linear elastic seabed support is adapted to the riser under the seabed vertical force fully considering nonlinear interaction of pipe and soil. The new program’s interaction of riser with seabed follows the p-y curves in this paper. Galerkin method is used in space discrete dynamic equation,and finally time domain iterates after discrete equation by the method of Newmark-β. The interaction of the riser with linear and nonlinear seabed soil is studied,and the steel catenary riser’s dynamic response in different cases of heaving amplitude is analyzed by using the new program after adaptation. The results show that the nonlinear seabed soil can be used to simulate a more accurate interaction between riser and soil,and the nodes at the touch-down zone of the riser may undergo different processes of the interaction.
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