地下管线三向地震动一致激励与非一致激励数值分析

基于某工业地下管道建立有限元模型,考虑管土相互作用和行波效应,综合分析在三向地震动一致激励与非一致激励下的管道动力响应结果,并且简单分析部分相关因素对管道动力响应结果的影响。结论如下:对于地下管道来说,非一致激励与一致激励作用下的位移响应曲线在峰值和形状方面存在较为明显的不同,具体表现为:非一致作用水平向位移远大于一致作用,而竖直向位移稍大于一致作用;对于应力响应,不管一致还是非一致激励,同一截面各处的应力响应有明显不同,并且总体来说非一致作用下较大;位于管道走向变化段、土层变化处和管道弯曲段的截面的位移响应峰值和应力响应一般会产生突变,说明这些因素对管道的动力响应具有较为明显的影响。

Numerical Analysis of Underground Pipeline under Uniform and Non-uniform Excitations of Three-directional Ground Motion

Based on one industrial underground pipeline,with soil-pipe interaction and traveling wave effect taken into consideration,a finite element model was built to study the dynamic response of pipelines under uniform and non-uniform excitation,and the influence of some relative factors was analyzed.The results are:the peak value of the displacement response curve under non-uniform excitation,as well as shape,differs from that under uniform excitation.Horizontal displacement under non-uniform excitation is apparently greater than that under uniform excitation,while vertical displacement under non-uniform excitation is slightly greater than that under uniform excitation.The stress response of one monitor point differs from that of other points on the same section under both uniform and non-uniform excitation,and the stress response under non-uniform excitation is more intense compared to that under uniform excitation.Displacement and stress of a pipeline in the subsurface is usually influenced by the change in soil properties and pipe trend and bucking under seismic excitation.