高铁列车运行作用下燃气管涵结构动力响应分析

THE DYNAMIC RESPONSE OF A GAS PIPELINE STRUCTURE TO RUNNING HIGH-SPEED TRAINS

以京张高铁跨越某燃气管涵为例,建立混凝土防护刚构-土体-燃气管涵三维动力有限元模型,将三维车辆-轨道刚柔耦合动力学模型计算得到的列车荷载施加到三维动力有限元模型中,分析燃气管涵结构的动力响应特性;预测京张高铁通车后对现有燃气管涵的振动影响。计算结果表明:燃气管涵振动速度和加速度响应主要集中在0 Hz^10 Hz的低频段,燃气管涵的最大动力响应点的速度峰值仍然小于《建筑工程容许振动标准》中规定的速度最大值限值。随着车速增大,管涵的速度及加速度时域响应明显增大。京张高铁运营后设计时速列车荷载的动力作用不会对混凝土刚构结构下的燃气管涵产生显著的不利影响。

The Beijing-Zhangjiakou High-speed Railway crossing a gas pipeline was an example to study the dynamic response of the gas pipeline structure to high-speed train loads.A 3D vehicle-track coupled dynamic model was built to calculate the loads.A 3D dynamic finite model for the protective rigid frame-soil-gas pipeline was built under the calculated loads.Comparing with the existing specifications,the assessment of the impact of the Beijing-Zhangjiakou High-speed Railway on the existing gas pipeline was carried out.The analysis results show that the frequency components of velocity and acceleration responses of the gas pipeline are mostly in the 0 Hz^10 Hz frequency band,which meets the criteria.The velocity and acceleration dynamic responses of the gas pipeline are increased with the increasing train speed.The dynamic effect of the train load with the design speed after the operation of the Beijing-Zhangjiakou High-speed Railway would not have a significant adverse effect on the gas pipeline under the U-shaped concrete rigid frame structure.