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针对柔性立管由于管道弯矩与曲率关系的非线性引起的动态时域分析问题,基于集中质量分析方法,考虑非线性弯曲刚度作为输入参数,建立柔性立管分析模型,进行管道拉力和曲率荷载的时域分析.对中国南海某1 500 m水深的柔性立管算例进行了动态时域分析.分析结果表明:立管拉力随长度增加而减小,最大点发生在顶部,曲率在顶部和底部都有较大值,中间曲率较小;与考虑线性弯曲刚度的分析结果比较,考虑非线性弯曲刚度得到的顶部拉力荷载时程曲线几乎无变化,而顶部和底部的曲率荷载时程曲线变化较显著;考虑非线性弯曲刚度输入可以得到更为准确的柔性立管时域分析结果.
Aiming at the problem of dynamic time-domain analysis of flexible riser due to nonlinearity of pipe bending moment and curvature, a flexible riser analysis model is established based on the method of mass analysis and the nonlinear bending stiffness is taken into account. Pipe riser and curvature load The time domain analysis of a flexible riser with a water depth of 1 500 m in the South China Sea was carried out. The results show that the riser tension decreases with the increase of length, the maximum point occurs at the top, the curvature at the top and Compared with the analysis results considering the linear bending stiffness, the curve of the top tension load time course obtained by considering the non-linear bending stiffness hardly changes, while the curvature curve of the top and bottom curve changes Which is more significant. Considering nonlinear bending stiffness input, more accurate results of time-domain analysis of flexible riser can be obtained.