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考虑介质和结构的相互作用 ,用有限元法研究了地上输液管道的动特性和地震动响应 .对某些介质和结构参数 ,给出了数值结果 ,分析了管内液体流动对系统固有频率及动力响应的影响 .随流速增大 ,频率下降 ,扭转及弯曲内力增大 ,对抗震是不利的 ,并且流速对弯曲内力影响小 ,对扭转内力影响比较大 ;当流速不大于 50m/s时 ,地震作用下的弯曲内力分析可不考虑流速影响 ,当流速不大于 10m/s时 ,地震作用下的扭转内力分析可不考虑流速影响 .
Taking into account the interaction between the medium and the structure, the dynamic characteristics and the ground motion response of the pipelines above ground are studied by the finite element method. Numerical results are given for some media and structural parameters. The influence of the liquid flow in the pipe on the natural frequency and power of the system With the increase of flow velocity, the frequency decreases, the torsion and the bending internal force increase, which is unfavorable to the earthquake resistance, and the flow velocity has little effect on the bending internal force and has a great influence on the torsional internal force. When the velocity is not more than 50m / s, Under the action of bending internal force analysis, the influence of velocity can be ignored. When the velocity is not more than 10m / s, the torsional internal force analysis under earthquake does not consider the effect of velocity.