地下管网地震反应分析模型

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...

Analysis Model of Buried Pipeline Network under Earthquake Ground Motions

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.