占压城市燃气管道力学性能试验研究

发布时间：2018-11-23 19:42

【摘要】：燃气管道是城市生命线工程的重要组成部分。当燃气管道受到外界荷载作用时,其力学性能是保障管道运行安全的基本属性。资料显示,燃气管道在附加外荷载作用下的破坏形态主要有:横截面环向受压破坏、纵向弯曲破坏和剪切破坏等。因此,开展燃气管道力学性能的试验研究具有重要意义。本文根据国内外燃气管道力学性能的研究状况,对城市中低压燃气管道常用的无缝钢管进行了受压、受弯足尺试验和抗剪模拟实验,分析了无缝钢管在外荷载作用下的力学性能和承载力极限状态。主要的研究内容有:1.总结国内外燃气管道的研究现状,分析燃气管道破坏时的外界荷载类型及产生原因。2.对DN57、DN89、DN108、DN159和DN219五种管径的燃气管道进行横截面受压性能试验研究,测试其承载力、应变和位移等数据,得出管道的径厚比是决定管道横截面承载力的主要因素。径厚比越大,横截面承载力越小。3.对DN57、DN89、DN108、DN159和DN219五种管径的燃气管道进行纵向受弯性能试验研究,管道在纵向受弯过程中,在加载初期都经历了线弹性变形阶段,管道的应变、位移具有很好的相关性,同荷载作用下管径越大,各测点位移和应变越小,管道变形呈现梁式的受力变形特征。4.对DN57、DN89、DN108、DN159和DN219五种管径的燃气管道进行抗剪ABAQUS模拟,结果表明:在剪切作用下,管道在材料远没有达到材料屈服强度时,就发生管道的屈曲破坏,因此,要特别关注管道受到剪切作用的受力状态。
[Abstract]:Gas pipeline is an important part of urban lifeline engineering. When gas pipeline is subjected to external load, its mechanical performance is the basic attribute to ensure pipeline operation safety. The data show that the main failure modes of gas pipeline under additional external loads are as follows: circumferential compression of cross section, longitudinal bending failure and shear failure. Therefore, it is of great significance to study the mechanical properties of gas pipeline. According to the research status of mechanical properties of gas pipeline at home and abroad, the seamless steel pipe which is commonly used in urban medium and low pressure gas pipeline is subjected to compression, bending full-scale test and shear simulation experiment. The mechanical properties and ultimate bearing capacity of seamless steel tube under external load are analyzed. The main research contents are as follows: 1. This paper summarizes the current research situation of gas pipeline at home and abroad, analyzes the types of external loads and the reasons for the failure of gas pipeline. 2. The cross section compression performance of DN57,DN89,DN108,DN159 and DN219 gas pipelines with five diameters is studied. The data of bearing capacity, strain and displacement are tested. It is concluded that the ratio of diameter to thickness is the main factor to determine the bearing capacity of pipeline cross section. The larger the ratio of diameter to thickness, the smaller the bearing capacity of cross section. The longitudinal bending behavior of gas pipelines with DN57,DN89,DN108,DN159 and DN219 diameters has been studied. During the process of longitudinal bending, the pipeline has undergone linear elastic deformation in the initial loading stage, and the strain and displacement of the pipeline have a good correlation. Under the same load, the larger the diameter of the pipe, the smaller the displacement and strain at each measuring point. The DN57,DN89,DN108,DN159 and DN219 gas pipelines with five diameters are simulated by ABAQUS. The results show that the pipeline buckling failure occurs when the material is far from reaching the material yield strength under the shear action. Special attention should be paid to the stress state of the pipe subjected to shear action.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU996.7

【相似文献】