【摘要】 利用随机振动理论 ,导出了埋地管线在大空间地面运动过程中的动力反应 .在建立管线模型时 ,接头简化为刚性 ,管线简化为弹性地基梁 .实例计算表明 ,对于轴向振动 ,埋地管线的各阶固有频率均十分接近 ,计算应力时需考虑较多的振型 .管线中部的位移、应力不随管线长度变化 .地震动的空间相关性对管线随机振动影响很大 ,应慎重选取地震地面运动的功率谱模式更多还原

【Abstract】 Using the theory of random vibration the effect of the spatial variation of seismic ground motions on the response of pipelines is examined. The joints are predigested as rigid joints and pipelines are predigested as elastic groundsill girders. Based on some examples, the frequencies differ little, so more modes are needed when calculating the stresses. The displacement, strains and stresses in the middle range of the pipeline change little. It is needed to choose and apply the power spectral density of ground motions, because the effects are gread.更多还原