压弯联合荷载下漂浮软管的极限压溃特性

作为海上输油系统重要组成部分的漂浮软管和水下软管是浮筒和浮式生产储油船(floating production storage and offloading, FPSO)以及浮筒和水下管汇之间的油气输送通道，漂浮软管等在风浪流等极端荷载作用下可能发生极限压溃损毁。以某型漂浮软管为研究对象，利用Abaqus有限元软件，结合rebar单元和Emended嵌入技术建立软管有限元数值模型，研究软管在内压和弯矩作用下的折弯压溃特性，并通过软管弯曲试验验证了该数值分析方法的正确性。计算结果表明：螺旋钢筋失稳是折弯压溃的主要原因，螺旋钢筋外侧的外帘线层在压溃区折弯处帘线拉力过大导致帘线破断。软管的内压荷载及软管的螺距与帘线的缠绕角度对极限压溃都有重要影响。该研究可为输油软管结构抗压溃设计和损伤诊断提供技术支持。

Study of the bending wrinkle behavior of the floating hose under internal pressure and bending moment loads

As an important part of the offshore oil transportation system, the floating hose and submarine hose is the oil and gas transportation channel between the buoy and the FPSO, as well as the buoy and the subsea manifold. Under extreme loads such as wind, waves, and currents, the floating hose may be crushed and damaged on the sea. In this paper, based on the rebar element and the embedded element technique in Abaqus software, a finite element model is created to investigate the crushing behavior of the floating hose under the internal pressure and the bending moment. Compared with the bending test of the hose, the numerical analysis method for the hose is verified. The result shows that the bending instability of the helix wire of the hose is the main reason of the bending wrinkle behavior of the hose, and the outer layer cord is prone to breakage during the bending and crushing process. The internal pressure load and the structural design parameters of the hose have a significant influence on the bending wrinkle. The research can provide technical support for the compressive collapse design and damage identification in hose application.