基于ABAQUS的海底管道铺设期间椭圆化损伤分析

Analysis on the Ovalization Damage of Seabed Pipelines During Laying Based on ABAQUS

在海底管道铺设安装过程中,张紧器的夹紧力和张力的变化,可能会对管道造成椭圆化损伤。椭圆化损伤对管道今后的安全性具有较大的影响。结合理论分析和ABAQUS有限元分析软件,提出计算管道椭圆化损伤的方法。对于夹紧力,结合DNV规范计算得到不同管道所能承受的最大夹紧力。分析发现,管径越小,壁厚越大,管道抵抗椭圆化损伤的能力越大。对于张力,利用elbow单元建模,其优势在于能够模拟beam单元无法分析的截面变形,同时又能避免采用shell单元可能出现的计算成本过大的问题。分析发现,张力减小,管道的椭圆化损伤增大。

In the process of seabed pipeline laying and installation, the changes of the clamping force and tensile force will lead to ovalization damage of the pipelines, imposing great influence on future security of the pipelines. Combined theoretical analysis with the finite element analysis software ABAQUS, a method is put forward to study pipeline ovalization damage. For clamping force, combined with the DNV standard, it is feasible to calculate the maximum clamping forces of different pipes. The analysis shows that the pipe with smaller diameter and greater wall thickness can bear greater clamping force and ovalization damage. For tensile force, it is more efficient to use the elbow element to build the model in ABAQUS. Compared with the beam element, it can simulate the deformation of the cross-section of the pipeline; and compared with the shell .element, it needs less computing costs. The analysis indicates that when the tensile force decreases, the ovalization damage of the pipeline increases.