摘要
将地震载荷作用下的液化区埋土管道模拟成受到液化土弹性力作用下的直梁模型,将管道两端约束等效化为两端弹性支承,考虑管-土间的相互作用和管内流体与管道之间的流固耦合作用,采用梁模型一般振型函数实施模态叠加法对液化区埋地管道进行地震响应的动态分析,探讨了管道、流体和液化土参数对管道上浮反应的影响。数值仿真结果表明:埋土管道在地震作用下砂土液化时的上浮位移,随液化区管道长度、管外径、管内流体流速、液化砂土的密度和管截面受到的轴向压应力的增大而增大,随管内输送流体的密度、液化土的相对弹性系数、管材的粘弹性系数和管截面受到的轴向拉应力的增大而减小,地震加速度幅值对管道上浮位移的影响相对较小。
The underground pipeline in liquefaction soil under seismic force was simplified as a simple beam with elastic supports on two ends. Considering the interaction of buried pipeline-soil and fluid-structures, the mode superposition method was used to analyze the dynamic response under seismic loading of underground pipeline. The influence of the parameters of the pipeline, flowing fluid and liquefied soil on floatation response were under discussion. The numerical results show that the floatation displacement of the pipeline buried with soil liquefied under the action of seismic loading is proportional to pipe length and diameter, fluid flowrate inside pipeline, the density of liquefaction soil and axial sectional pressed force of pipe as well, but is proportional conversely to the fluid density inside pipeline, relative elastic coefficient of liquefaction soil, visco-elastic coefficient of pipe and the axial sectional drawn force. The effect of seismic acceleration amplitude on the floatation of pipeline is a trace that can be ignored in the floatation response analysis.
出处
《工程力学》
EI
CSCD
北大核心
2008年第6期170-175,共6页
Engineering Mechanics
基金
国家自然科学基金资助项目(50075010)
关键词
埋地管道
液化土
砂土液化
地震响应
上浮反应
buffed pipeline
liquefaction soil
soil liquefied
seismic response
floatation response
