简化为弹性地基梁的地下管线的随机反应分析

Random Response Analysis of Pipelines Predigested as Beam on Elastic Foundation

本文利用随机振动理论 ,研究了地下管线在大空间地面运动过程中的动力反应问题。在建立管线模型时 ,接头简化为刚性接头 ,同时管线简化为弹性地基梁。在分析过程中 ,不考虑管线的弯曲应力和应变 ,仅考虑轴向应力和应变。采用随机反应分析的方法 ,通过输入地面运动的功率谱 。

Using the theory of random vibration,the effect of the spatial varation of seismic ground motions on the response of pipelines is examined The joints are predigested as rigid joints and the pipelines are predigested as beam on elastic foundation In the process of analysis,we consider the axial reaction neglecting the bending response The power spectral density of stress or strain of pipeline in axial direction is calculated through the power spectral density of ground movement by use of the theory of random vibration