地下管道的纵向地震响应分析与抗震设计研究

Analysis in Longitudinal Seismic Response of Underground Pipelines and its Aseismatic Design

基于与盾构结构地下管道(简称盾构管道)纵向变形性能相似的梁单元建立管道的纵向等价连续化模型,该模型将管道简化为黏弹性地基上的连续梁,用非线性弹簧和阻尼器来模拟土与管道结构之间的相互作用。为了探讨盾构管道的纵向地震响应特性,采用地层-管道三维等价连续化有限元模型对某过江盾构管道的地震响应进行了分析。利用动态显式算法进行地震作用分析,主要研究了合理的管道力学模型、管道与地层之间的相互作用以及管道的振动特性。计算结果反映了地基土和盾构管道在地震工况下的相互作用和变形,得出了盾构管道水平位移和应力分布及其随时间变化的曲线,并将计算结果与基于拟实仿真有限元模型的结果进行了对比。

The pipeline vertical equivalent continuous model was established with the beam element which was similar to the longitudinal deformation performance of the underground pipeline in shield structure.The pipeline was simplified to the continuous beam on viscoelastic foundation in the model,the interaction between the soil and the structure simulated with nonlinear spring and damper.In order to investigate the vertical seismic response characteristics of the underground pipeline in shield structure,seismic responses of shield pipeline in crossing a river were analyzed by three-dimensional equivalent continuous finite element model of stratum-pipeline.The seismic analysis was made by dynamic explicit calculation method,the reasonable pipeline mechanical model,the interaction between the pipeline and stratum,and vibration character of the pipeline discussed.The interaction between the foundation soil and shield pipelines,and the deformations in earthquake conditions were showed in the results of calculation,and the curve of between the shield pipeline displacement and the stress distribution with change of time obtained,and the conclusions between the calculation and quasi-real simulation model compared with.