液化区埋地管线的数值模拟分析
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摘要
利用ANSYS有限元分析软件,建立了由场地土液化引起的地下管道上浮反应的分析模型。用土弹簧模型模拟地下管道的受力特点,考虑了管土之间相互作用的非线性特征,通过算例分析了管道在发生上浮反应时的应力应变曲线,探讨了液化区埋地管道在发生上浮位移时的受力特征,得出了一些有意义的结果。主要有:管线的应力应变以轴向为主,并且管顶和管底的受力最大,管侧相对于管顶和管底轴向应力应变很小可以忽略;最大应变位于液化区和非液化区交界处;管线中点处等效应力达到极值等等。
An analytic model for the floatation response of buried pipeline in liquefied soil is established by using finite element analysis software of ANSYS.In order to simulate the force feature of the buried pipeline,the soil spring model is used and the nonlinear characteristics for pipe-soil interaction are also considered.The stress-strain curves of the buried pipeline caused by floatation response are analyzed through an example.And the stress characteristics of buried pipeline in liquefied soil when occurring floatation response is explored.The study gets some conclusions accordant with the experimental results:the axial stress and strain along pipline are the most important responses,and the stress at the pipline's bottom and top are the biggest,the stress and the strain of tube side are very small which can be ignored.the maximum strain appeared at the junction of liquefied area and unliquefied area;equivalent stress at the middle point of the pipline reaches its extreme value.
An analytic model for the floatation response of buried pipeline in liquefied soil is established by using finite element analysis software of ANSYS.In order to simulate the force feature of the buried pipeline,the soil spring model is used and the nonlinear characteristics for pipe-soil interaction are also considered.The stress-strain curves of the buried pipeline caused by floatation response are analyzed through an example.And the stress characteristics of buried pipeline in liquefied soil when occurring floatation response is explored.The study gets some conclusions accordant with the experimental results:the axial stress and strain along pipline are the most important responses,and the stress at the pipline's bottom and top are the biggest,the stress and the strain of tube side are very small which can be ignored.the maximum strain appeared at the junction of liquefied area and unliquefied area;equivalent stress at the middle point of the pipline reaches its extreme value.
引文
[1]甘文水,侯忠良.液化土中埋设管道的上浮反应分析[J].特种结构,1959,6(3):3-7.Gan Wenshui,Hou Zhongliang.Study on the floatation response of buried pipelines due to soil liquefaction[J].Special Structures,1959,6(3):3-7.
[2]林均岐,熊建国.液化场地土中埋设管线的上浮反应分析[J].地震工程与工程振动,2000,20(2):97-100.Lin Junqi,Xiong Jianguo.Study on the floatation response of buried pipelines due to soil lique faction[J].Journal of Earthquake Engineering and Engineering Vibration,2000,20(2):97-100.
[3]高田至郎.地下管线抗震[M].学术书刊出版社,1988.Takada,Shiro.Earthquake Resistance of Buried Pipeline[M].Academic Books and Periodicals Press,1988.
[4]林均岐,李祚华,胡明袆.液化土中管道上浮反应的影响因素研究[J].地震工程与工程振动,2005,25(4):130-134.Lin Junqi,Li Zuohua,Hu Mingyi.Study on influential factors of buried pipeline floatation response due to soil liquefaction[J].Journal of Earth-quake Engineering and Engineering Vibration,2005,25(4):130-134.
[5]赵林,冯启明.埋地管线有限元建模方法研究[J].地震工程与工程振动,2001,21(2):53-57.Zhao Lin,Feng Qimin.Research on methods for establishing FEMmodel of buried pipelines[J].Journal of Earthquake Engineering and Engi-neering Vibration,2001,21(2):53-57.
[6]史永霞.埋地管线在沉陷情况下的响应分析[D].大连:大连理工大学抗震研究所,2007.Shi Yongxia.Response analysis for buried pipelines subjected to the settlement[D].Institute of Engineering Earthquake Resistance,Da Lian U-niversity of Technology,2007.
[7]李祚华.场地土液化引起的地下管线的上浮反应研究[D].哈尔滨:中国地震工程力学研究所,2004.Li Zuohua.Study on floatation response of buried pipeline induced by soil liquefaction[D].Institute of Engineering Mechanics,China Earthquake Adminstration,2004.
[8]冯启民,赵林.跨越断层埋地管道的屈曲分析[J].地震工程与工程振动,2001,21(4):80-87.Feng Qimin,Zhao Lin.Buckling analysis of buried pipes subjected to fault movements[J].Journal of Earthquake Engineering and Engineering Vibration,2001,21(4):80-87.
[9]管国军.地基地面大位移及其对埋地管线影响的非线性有限元分析[D].天津:天津大学,1999.Guan Guojun.Nonlinear finite element analysis for buried pipeline of foundation and ground big settlement[D].Tian Jin:Tian Jin University,1999.
[10]黄忠邦,高海,项忠权.埋地管线在均匀和非均匀土介质中的地震反应[J].天津大学学报,1995,28(1):55-60.Huang Zhongbang,Gao Hai,Xiang Zhongquan.Research on seismic response in uniform and non-uniform soil medium for buried pipelines[J].Journal of Tianjin University,1995,28(1):55-60.
[11]龚爱民,傅蜀燕,黄海燕.AN SYS软件在分析地下埋管工程中的应用[J].安徽建筑工业学院学报:自然科学版,2004,12(5):51-55.Gong Aimin,Fu Shuyan,Huang Haiyan.The application of analysis in filled conduit analysis[J].Journal of Anhui Institute of Architecture,2004,12(5):51-55.
[12]Nishio N.Dynamic strain in buried pipelines due to soil liquefaction[J].Earthquake Behavior,1987,162:83-89.
[13]Wang L R,Zhang H.Buried pipeline system in a liquefaction environment[C]//Proc.10WCEE,1992,5529-5534.
[2]林均岐,熊建国.液化场地土中埋设管线的上浮反应分析[J].地震工程与工程振动,2000,20(2):97-100.Lin Junqi,Xiong Jianguo.Study on the floatation response of buried pipelines due to soil lique faction[J].Journal of Earthquake Engineering and Engineering Vibration,2000,20(2):97-100.
[3]高田至郎.地下管线抗震[M].学术书刊出版社,1988.Takada,Shiro.Earthquake Resistance of Buried Pipeline[M].Academic Books and Periodicals Press,1988.
[4]林均岐,李祚华,胡明袆.液化土中管道上浮反应的影响因素研究[J].地震工程与工程振动,2005,25(4):130-134.Lin Junqi,Li Zuohua,Hu Mingyi.Study on influential factors of buried pipeline floatation response due to soil liquefaction[J].Journal of Earth-quake Engineering and Engineering Vibration,2005,25(4):130-134.
[5]赵林,冯启明.埋地管线有限元建模方法研究[J].地震工程与工程振动,2001,21(2):53-57.Zhao Lin,Feng Qimin.Research on methods for establishing FEMmodel of buried pipelines[J].Journal of Earthquake Engineering and Engi-neering Vibration,2001,21(2):53-57.
[6]史永霞.埋地管线在沉陷情况下的响应分析[D].大连:大连理工大学抗震研究所,2007.Shi Yongxia.Response analysis for buried pipelines subjected to the settlement[D].Institute of Engineering Earthquake Resistance,Da Lian U-niversity of Technology,2007.
[7]李祚华.场地土液化引起的地下管线的上浮反应研究[D].哈尔滨:中国地震工程力学研究所,2004.Li Zuohua.Study on floatation response of buried pipeline induced by soil liquefaction[D].Institute of Engineering Mechanics,China Earthquake Adminstration,2004.
[8]冯启民,赵林.跨越断层埋地管道的屈曲分析[J].地震工程与工程振动,2001,21(4):80-87.Feng Qimin,Zhao Lin.Buckling analysis of buried pipes subjected to fault movements[J].Journal of Earthquake Engineering and Engineering Vibration,2001,21(4):80-87.
[9]管国军.地基地面大位移及其对埋地管线影响的非线性有限元分析[D].天津:天津大学,1999.Guan Guojun.Nonlinear finite element analysis for buried pipeline of foundation and ground big settlement[D].Tian Jin:Tian Jin University,1999.
[10]黄忠邦,高海,项忠权.埋地管线在均匀和非均匀土介质中的地震反应[J].天津大学学报,1995,28(1):55-60.Huang Zhongbang,Gao Hai,Xiang Zhongquan.Research on seismic response in uniform and non-uniform soil medium for buried pipelines[J].Journal of Tianjin University,1995,28(1):55-60.
[11]龚爱民,傅蜀燕,黄海燕.AN SYS软件在分析地下埋管工程中的应用[J].安徽建筑工业学院学报:自然科学版,2004,12(5):51-55.Gong Aimin,Fu Shuyan,Huang Haiyan.The application of analysis in filled conduit analysis[J].Journal of Anhui Institute of Architecture,2004,12(5):51-55.
[12]Nishio N.Dynamic strain in buried pipelines due to soil liquefaction[J].Earthquake Behavior,1987,162:83-89.
[13]Wang L R,Zhang H.Buried pipeline system in a liquefaction environment[C]//Proc.10WCEE,1992,5529-5534.
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