交通载荷作用下埋地聚乙烯燃气管道的有限元分析
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摘要
运用非线性有限元法,在ANSYS中建立埋地PE燃气管道的有限元模型,对交通载荷作用下的埋地PE管进行瞬态分析,得到管道应力及直径变形量随时间的变化关系,比较不同管顶覆土厚度下的管道力学性状。研究发现,建立的有限元模型,其计算结果能够较为真实地反映PE管的蠕变行为,聚乙烯的黏弹性降低了管道应力梯度,管顶覆土对交通载荷作用下埋地PE管道有减荷效果。交通载荷是引起管道形变的主要因素,适当增加管道埋深刻提高管道寿命。
Using nonlinear finite element method(FEM),the FEM model of buried polyethylene(PE)gas pipeline was established with ANSYS.Traffic load and transient analysis of the buried gas PE pipe was applied.The changing relation of pipe stress and the deformation in pipe diameter along with time were obtained.With differences of pipeline laying depth,the mechanical behaviors of buried pipelines were compared.The result showed that the establishment of FEM model could provide the result which react the creep behavior of PE pipe faithfully.Viscoelasticity of PE pipe decreased pipe stress gradient,covering soil had effect on load reduction under the traffic load.Traffic load was the main reason of the pipe deformation.Appropriate increase in pipeline depth could increase pipe life.
Using nonlinear finite element method(FEM),the FEM model of buried polyethylene(PE)gas pipeline was established with ANSYS.Traffic load and transient analysis of the buried gas PE pipe was applied.The changing relation of pipe stress and the deformation in pipe diameter along with time were obtained.With differences of pipeline laying depth,the mechanical behaviors of buried pipelines were compared.The result showed that the establishment of FEM model could provide the result which react the creep behavior of PE pipe faithfully.Viscoelasticity of PE pipe decreased pipe stress gradient,covering soil had effect on load reduction under the traffic load.Traffic load was the main reason of the pipe deformation.Appropriate increase in pipeline depth could increase pipe life.
引文
[1]孙逊.聚烯烃管道[M].北京:化学工业出版社,2006:264-447.
[2]董孝理.塑料压力管道的力学破坏和对策[M].北京:化学工业出版社,2006:7-42.
[3]MOGHADDAS TAFRESHI S N,KHALAJ O.Laboratorytests of small-diameter HDPE pipes buried in reinforced sandunder repeated-load[J].Geotext Geomembr,2008,26(2):145-163.
[4]CJJ63—2008聚乙烯燃气管道工程技术规程[S].
[5]彭网大,杨风云,廖庆惠,等.HTPB复合固体推进剂黏弹特性研究———主松弛模量的时间、温度依赖性[J].推进技术,1984(2):6-18.
[6]GB/T15558—2003燃气用聚乙烯管材[S].
[7]罗得把,产启刚.基于ANSYS的土工格栅加筋路堤分析[J].山西建筑,2007,33(33):282-283.
[8]柳春光,史永霞.沉陷区域埋地管线数值模拟分析[J].地震工程与工程振动,2008,28(4):178-183.
[9]赵远清.高密度聚乙烯检查井结构设计研究[J].特种结构,2008,25(1):69-70.
[2]董孝理.塑料压力管道的力学破坏和对策[M].北京:化学工业出版社,2006:7-42.
[3]MOGHADDAS TAFRESHI S N,KHALAJ O.Laboratorytests of small-diameter HDPE pipes buried in reinforced sandunder repeated-load[J].Geotext Geomembr,2008,26(2):145-163.
[4]CJJ63—2008聚乙烯燃气管道工程技术规程[S].
[5]彭网大,杨风云,廖庆惠,等.HTPB复合固体推进剂黏弹特性研究———主松弛模量的时间、温度依赖性[J].推进技术,1984(2):6-18.
[6]GB/T15558—2003燃气用聚乙烯管材[S].
[7]罗得把,产启刚.基于ANSYS的土工格栅加筋路堤分析[J].山西建筑,2007,33(33):282-283.
[8]柳春光,史永霞.沉陷区域埋地管线数值模拟分析[J].地震工程与工程振动,2008,28(4):178-183.
[9]赵远清.高密度聚乙烯检查井结构设计研究[J].特种结构,2008,25(1):69-70.
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