基于ANSYS的隧道内输气管道应力分析

Stress Analysis of Gas Pipeline in Tunnel Based on ANSYS

隧道内的弯管处通常是应力集中的地方,使得管道处于危险甚至失效状态。为了研究隧道内弯管在不同情况下的受力,利用有限元分析软件ANSYS建立弯管的有限元模型,明确了隧道内垂直L型和Z型弯管的应力分布情况和应力集中点。研究结果表明:在试压和运行状态下,弯头处所受的应力最大,管道内压是引起管道应力的主要因素。隧道内管道最大应力随管道半径的增大而逐渐增大,呈近似线性关系。不同形状的弯管结构分布会对弯管的应力分布产生影响。L型弯管的最大应力随两臂长的增加先增大后减小,Z型弯管的最大应力随相互平行的两弯管的增大而逐渐增大。

The elbows in the tunnel are usually the stress concentration point. They make the pipeline be in dangerous or even failure states. In order to study the stress condition in tunnel under different conditions, the finite element analysis software ANSYS was used to build the finite element model to carry out the numerical simulation in order to find out the stress distribution and the stress concentration points in type ＂L＂ and type ＂Z＂ pipelines. The results show that, under pressure testing and operating condition, the pressure of the elbow is the highest. The inner pressure in the pipeline is the main factor to cause the stress. The maximum stress of pipeline in the tunnel gradually increases along with the pipe radius increasing, and there is an approximate linear relationship between them. The different structure of elbow can affect the stress distribution, the maximum stress on ＂L＂ pipe first increases and then decreases with the increase of arm length, but it always increases on ＂Z＂ pipe.