【摘要】 建立了多点地震动激励作用下的地下管网地震反应拟静力分析模型。首先建立基于有限单元模型的地下管网系统刚度方程,接着给出考虑地震动空间相关性及场地条件等诸多因素的地震动场模拟思路及管网系统地震动施加策略,最后通过解析法验证了模型的正确性。采用本文方法对一"十"字形管网进行了地震反应分析,结果表明:①管线轴向应力沿着管线长度从管线端部向管线交叉点逐步增大,在管线交叉点处应力达到最大值;②与轴向应力相比,尽管管线的弯曲应力不是控制应力,但在管线端部及管线交叉点处弯曲应力值将会有较大突变。因此,对于地下管网而言,在受到地震作用时,不同布置方向的管线之间的相互影响是不容忽视的。更多还原

【Abstract】 Pseudo-static analysis model of buried pipeline network under multiple-support seismic excitations is presented.Based on FEM model,the stiffness equation of buried pipeline network is established. Considering the spatial correlation of different ground motions and the non-uniformity of soil conditions, the simulation of ground motion field is introduced and the method of motion input on pipeline network is proposed.The validity of this model is proved then by theoretical solutions.Finally,a cross type pipeline network under seismic excitations is analyzed by this method,the result shows that:1)axial stress increases gradually along pipeline from the end to intersection of the two pipelines,and reaches peak value at intersection point;2)compared with axial stress,bending stress is much smaller,but abrupt changes appear at the end and intersection of the pipeline network.Therefore,it is necessary to analyze the pipeline network as a system under seismic excitations.更多还原