Z形直埋供热弯管的应力分析

Stress analysis of Z-shape directly buried heating bend pipe

利用ANSYS软件对直径1400mm的Z形供热直埋弯管进行了应力计算,建立了有限元模型,分析了影响Z形弯管应力变化的主要因素,并分别对补偿臂长度为1.0、0.9、0.8、0.7、0.6、0.5、0.4倍的变形段长度工况进行了数值模拟及分析,结果表明:直径1400mm的Z形供热直埋弯管在压力荷载和温度荷载共同作用下满足应力叠加原理;补偿臂长度小于0.7倍变形段长度时,弯管应力值迅速增大,工程中对于直径1400mm的直埋Z形弯管应尽量采用补偿臂长度大于0.8倍及以上的变形段长度,否则会增加管道运行的不安全性。

The stress calculation of the Z-shaped heating directly buried bent pipe of 1400 mm diameter is carried out by using ANSYS software,a finite element model is established, the main affecting factors on stress distribution of Z shaped heating directly buried bent pipe were analyzed. Performing numerical simulation and analysis when the length of compensation arm is 1. 0 0. 9 0. 8 0. 7 0. 6 0. 5 0. 4 times the elastic arm length. The results indicate that The Z shaped heating directly buried bent pipe of 1400 mm diameter meets the principle of stress superposition under the combined action of pressure load and temperature load; When the length of compensation arm less than 0. 7 times the elastic arm length, the stress value of the elbow increases rapidly.In the project, the Z shaped heating directly buried bent pipe of diameter 1400 mm should be used when the length of compensation arm greater than 0. 8 times the elastic arm length,otherwise the unsafe operation of the pipeline will be increased.