海底多段悬跨管道涡激振动特性分析

深海海底多跨管道相比于单跨,其涡激振动行为却更为复杂。文章考虑了两端跨肩和中间支撑处的管—土作用边界条件,提出了多跨管道涡激振动预报模型,标定了模型参数,并重点分析了跨肩边界条件、中间支撑条件和悬跨长度对管道涡激振动特性的影响。结果表明:较大的两端边界处扭转弹簧弹性系数、较大的中间支撑处扭转和拉伸弹簧弹性系数和较短的悬跨长度,会限制管道结构高阶模态的激发,同时还发现了振动能量会在相邻管跨之间传递的现象。

Study on Vortex-Induced Vibrations (VIV) of multi-spans pipelines

Multi-spans submarine pipelines are more normal than single-span ones at the bottom of deep sea. And their VIV characteristics are more complex. In this paper, the boundary condition in shoulders and pipe-soil interaction at the middle support were considered. A wake oscillator model for VIV prediction of multi-spans pipelines was introduced, and the model parameters were estimated. The influence of multi-spans length and boundary conditions in shoulders and middle support on the VIV of pipelines was ana-lyzed. The results indicates that increasing the torsional spring stiffness and stretching spring stiffness may limit the occurrence of high mode, increasing the length of multi-spans submarine pipelines may cause high mode to easily happen. And it was also found that the energy could pass through the neighbor spans when the pipeline was suffered from VIV.