冻土膨胀对管道及法兰连接应力变化影响分析

Analysis of Influence of Frozen Soil Expansion on Stress Changes of Pipeline and Flange

冻土膨胀会使燃气管道产生应力集中,导致高压燃气管道极易发生失效甚至破裂,从而引发爆炸事故。为了研究冻土膨胀对管道及法兰连接应力变化影响,使用Workbench对管道及法兰连接进行分析。以位移载荷20 mm为例,观察管道及法兰连接的应力分布情况,并研究其在0~30 mm位移情况下的应力变化。结果表明:管道最大应力出现在管道弯头处;法兰盘最大应力出现在法兰盘与管道焊接处;管道的应力变化随着位移的增加变化最大,法兰盘次之,螺栓的应力平稳增加。

The expansion of frozen soil can cause stress concentration in gas pipelines,which can lead to failure or even rupture of high-pressure gas pipelines,leading to explosion accidents.In order to study the influence of frozen soil expansion on the stress changes of pipelines and flange connections,Workbench was used to analyze the pipeline and flange connections.Taking a displacement load of 20 mm as an example,the stress distribution of pipeline and flange connections was observed,and their stress changes under 0~30 mm displacement was studied.The results indicate that the maximum stress in the pipeline occurs at the elbow,the maximum stress of the flange plate occurs at the welding point between the flange plate and the pipeline.The stress change of the pipeline changes the most with the increase of displacement,followed by the flange plate,and the stress increase of the bolt is relatively stable.