地震载荷作用下埋地输气管道的数值模拟  

Numerical Simulation of the Dynamic Response of Buried Gas Pipeline under Seismic Load

作　　者：赵新威 曾祥国[1] 姚安林[2] 张毅 李星[1] 

机构地区：[1]四川大学建筑与环境学院 [2]西南石油大学石油工程学院 [3]宝鸡钢管资阳钢管厂技术科

出　　处：《石油机械》2014年第3期104-109,共6页China Petroleum Machinery

基　　金：四川省应用基础研究计划项目"高压输气管线钢变形与失效的多尺度行为研究"(13JC0277);西气东输管道工程项目(07H461);教育部创新团队计划项目(ITR1027)

摘　　要：为了弄清埋地输气管道在地震载荷作用下的动态失效过程,首先对X80管线钢进行了力学性能测试,获得了弹塑性材料线性强化的本构模型参数。然后基于非线性动力学理论、有限元算法和ANSYS有限元商业软件,建立了土-埋地输气管道在动力接触条件下的相互作用模型。载荷采用加速度时程的方法输入天津波,震级为7级,获得了不同壁厚条件下输气管道的动态应力应变响应和带缺陷管道的动态应力强度因子的时程曲线。由X80管线钢的临界应力强度因子,得出了管道极限承载条件下壁厚的下限值以及施加的加速度最大值。提供的方法和数据对埋地输气管道破坏的预防以及管道的抗震设计、施工具有一定的参考价值。To clarify the dynamic failure process of buried gas pipeline under the eft＇eel of seismic load, the mechanical performance test of X80 pipeline steel, obtaining the constitutive model parameter for the linear harden- ing of elasloplastic material. Then, on the basis of nonlinear dynamic theory, finite element algorithm and ANSYS software, the interactive model of soil-buried gas pipeline in the condition of dynamic contact was established. The load is applied by adopting the method of acceleration time history to enter Tianjin seismic waves with magnitude 7, obtaining the time history curve of the gas pipeline＇ s dynamic response in different wall thickness eonditions and the dynamic stress strength factor of the defected pipeline. The lower limit value of wall thickness in the pipeline limit load condition and the applied maximum acceleration value were obtained on the basis of the critical stress strength factor of X80 pipeline steel. The provided method and data are of importance to the prevention of buried gas pipeline damage as well as the aseismatic design and construction of pipeline.

关 键 词：地震载荷 埋地输气管道 动态响应 X80管线钢 有限元方法 

分 类 号：TE832[石油与天然气工程—油气储运工程]