基于异形梁模型的海洋柔性管缆防弯器数值模拟

为防止海洋柔性管缆在自重和环境载荷作用下的局部曲率过大而发生结构失效,在连接部位安装防弯器增加管缆弯曲刚度,并使管缆曲率分布均匀.分析防弯器力学性能和在位特点,阐述计算难点和几种数值建模方法的可行性与效果,并具体讨论用梁单元建立防弯器异形梁有限元模型的优势.利用平面异形梁单元特点,采用等效弯曲刚度进行防弯器结构分析,从而形成一套简洁高效的数值分析方法.通过数值算例评价该计算方法的适用性.

Numerical simulation on bending stiffener of flexible marine pipe/cable based on special shape beam model

To prevent the structural failure of flexible marine pipe/cable due to the too large local curvature generated by self-gravity and environment load effects, the bending stiffeners are installed at the joints which can increase the bending stiffness of pipe/cable and make the curvature distribution uniform. Through the analysis on the bending stiffener＇s mechanical properties and working conditions, the calculation difficulties and the feasibility and effect of several kinds of numerical modeling methods are described, and the advantages of building finite element model in beam elements are further discussed in detail. According to the characteristics of plane beam elements, the bending stiffener structure is analyzed by equivalent bending stiffness. So a simple and efficient numerical analysis method is given. A numerical example is shown to evaluate the applicability of the calculation method.