钢悬链线立管整体干涉分析研究

深水海洋立管具有柔性,特别是极端海况条件下,相邻立管之间可能发生互相干涉而增大立管的应力,从而影响其疲劳寿命.钢悬链线立管相比顶张力立管,有效张力较小,对环境载荷作用更加敏感,更容易发生碰撞.基于动力学分析软件OrcaFlex建立有限元模型,从允许碰撞的角度出发,对串列布置于张力腿平台上的两根钢悬链线立管进行整体碰撞分析,研究立管间距、尾流模型、拖曳力系数、海流流速和柔性接头刚度对立管碰撞的影响,阐述对碰撞范围、上下游立管相对运动速度、最大碰撞速度和最大碰撞能量的影响规律,为实际工程中立管的空间布置和结构优化设计提供参考.

Analysis of Global Interference between Steel Catenary Risers

Mutual interference may be occurred between adjacent marine risers because of their flexibility, especially in extreme conditions. As a result, the stress of the risers and their fatigue life will be influenced by interference. The effective tension of steel catenary riser is smaller compared with top tension riser. This kind of riser is more sensitive to environmental loading and more likely to collide. The finite element model is established in the dynamic analysis software OrcaFlex, and the global interference of adjacent steel catenary risers is analyzed in the case of permission collision. The effect on risers interference of these parameters, such as the riser spacing, wake model, drag coefficient, current velocity and flexible joint stiffness, is studied. The rules of the global collision include interference region between two adjacent SCRs, relative velocity, maximum impact velocity and collision energy are obtained, which can provide reference for the spatial arrangement and structure optimization in practical engineering.