埋地管道在地震波作用下受力模型研究

Study on the mechanical model of buried pipeline under seismic wave action

基于弹性地基梁模型和波动理论,将地震波简化为正弦波,管土之间以弹簧连接,建立了埋地管道的轴向受力模型、横向受力模型、扭转受力模型及考虑组合变形下的组合受力模型。然后研究了地震烈度、管径、场地类别对管道轴向应力、横向应力、扭转应力和组合应力的影响。研究结果表明:地震烈度越大,管道越容易破坏;采用大管径管道或者将管道埋设在坚硬场地中有利于提高管道的抗震性能。建立的理论模型完善了埋地管道的扭转受力分析,以及基于组合变形条件下的管道组合受力分析,对埋地管道的抗震设计具有一定的理论意义和应用价值。

Based on the elastic foundation beam model and the wave theory,the seismic wave is simplified as a sine wave,and the soil and pipe are connected by springs.An axial force model,a lateral force model,a torsion force model of buried pipelines and a combination of deformations under combined deformation are established.Then the effects of seismic intensity,pipe diameter,and site type on the axial stress,lateral stress,torsional stress,and combined stress of the pipeline are studied.The results show that the greater the seismic intensity is,the more easily the pipelines will be damaged;the use of large-diameter pipelines or pipelines being embedded in a hard site helps improve the seismic performance of the pipelines.The established theoretical model improves the analysis of the torsional stress of buried pipelines,and the analysis of the combined force of pipelines based on the combined deformation conditions.It has both theoretical significance and application value for the seismic design of buried pipelines.