基于ABAQUS的压力管道敷设方式对应力及变形影响研究

Study on Influence of Pressure Pipeline Laying Method on Stress and Deformation Based on ABAQUS

管道内压是影响管道应力的主要因素,而长输管道多采用架空、埋地、出入土等敷设方式以适应复杂地形,基于ABAQUS仿真软件建立3种敷设方式管道模型,研究管道不同位置、不同截面处的应力分布及变形特征随内压变化规律。结果表明:在内压作用下,架空管道等效应力最大值在管道与支撑接触附近,埋地管道等效应力最大值在埋地管管顶与管底处,出入土管道等效应力最大值在管道弯头内侧;架空管道呈现波浪变形,埋地管道在覆土压力作用下截面呈现椭圆形,出入土管道变形最大位置在“几”字形拐角处;管道轴向应力与环向应力比值与管道约束有关,约束管道比值为泊松比,非约束管道比值为0.5,该规律可用于确定管道高应力区域,减少非必要检测。

The internal pressure of pipelines is the main factor affecting the stress of pipelines,while long-distance pipelines mostly adopt overhead,buried,inlet and outlet soil and other laying methods to adapt to complex terrain,based on ABAQUS simulation software,three laying mode pipeline models were established to study the stress distribution and deformation characteristics of different positions and sections of pipelines with the change of internal pressure.The results show that under the action of internal pressure,the maximum value of the Von Mises stress of overhead pipeline is near the contact between the pipeline and the support,the maximum value of the Von Mises stress of buried pipe is at the top and bottom of the buried pipe,and the maximum value of the Von Mises stress of the inlet and outlet soil pipeline is on the inside of the pipe elbow.The overhead pipeline shows wave deformation,the section of the buried pipeline shows oval shape under the action of the overlying pressure,and the maximum deformation of the inlet and outlet pipelines is at the corner of the“several shape”.The ratio of axial stress to ring stress of pipeline is related to pipeline constraints,ratio of constrained pipes is Poissons ratio,and ratio of unconstrained pipelines is 0.5,this rule can be used to determine the high stress area of the pipelines and reduce unnecessary inspection.