%A LI Jun, QIN Chaokui, YAN Mingqing
%T Structural Reliability Analysis of Buried Steel High-pressure Gas Pipeline
%0 Journal Article
%D 2014
%J Science & Technology Review
%R 10.3981/j.issn.1000-7857.2014.h2.010
%P 75-78
%V 32
%N 28/29
%U {http://www.kjdb.org/CN/abstract/article_12095.shtml}
%8 2014-10-08
%X Urban gas facility is one of the urban lifeline engineering and many variables affect buried gas pipeline failure. To analyze the influence of randomness and uncertainty of variables on the safe operation of urban gas pipeline, the reliability theory and its application in pipeline are studied. Moreover, buried pipe failure model is established and various factors affecting the structural reliability of the urban high-pressure gas pipeline are analyzed, under the design pressure of 4.0 MPa, using the advanced First Order Second Moment (FOSM). The results show that, the influences of variables on the buried gas pipeline reliability are in the following descending order: the material yield strength, the pipe wall thickness, the internal fluid pressure, the vertical load, the bendingmoment coefficient, the pipe diameter, the deflection coefficient, the elastic modulus and any other factors. Keeping the variation coefficients at a constant of 0.05, the pipe reliability index increases with the material yield strength, the pipe wall thickness, the deflection coefficient, and decreases with other variables mentioned above. At the same time, the reliability index is related with the variation coefficient, the greater the variation coefficient, the smaller the reliability index. This conclusion is substantiated not only for the parameters positively correlated with the failure probability, but also for the parameters inversely related to the probability. Finally, some suggestions are provided to improve the structural reliability analysis of the urban high-pressure gas pipeline.