Stochastic vibration analysis of earthquake early warning threshold for high speed railway

被引：0
|
作者：
Li H. [1 ]
Zhang H.-R. [1 ]
Yu Z.-Y. [1 ]
机构：
[1] School of Civil Engineering, Beijing Jiaotong University, Beijing
来源：
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | 2019年 / 32卷 / 05期
关键词：
Frequency response; Seismic excitation; Shaking table test; Vehicle-track model; Wheel lift;
D O I：
10.16385/j.cnki.issn.1004-4523.2019.05.016
中图分类号：
学科分类号：
摘要：
In order to study the dynamic response and early warning threshold of vehicles, the shaking table test of the vehicle-track model is carried out, and the test results are compared with the calculation results of the vehicle-track numerical calculation model. The comparison results are basically consistent which indicates that the numerical calculation model is correct. Subsequently, the spectral characteristics of seismic waves are analyzed, and the results show that when the seismic wave frequency is near 1Hz, it is easy to resonate with the horizontal natural frequency of the vehicle body. Therefore, appropriate measures should be taken in vehicle design to keep the natural vibration frequency of the vehicle system away from the lower frequency domain. Last, a new idea for determining the earthquake early warning threshold of high-speed railway is proposed. Based on the vehicle-track numerical model, 80 typical ground motion records are selected and applied to the vehicle-track mathematical model for time-history analysis and calculation. The parameters such as wheel lift, wheel-rail contact point horizontal displacement, vehicle body overturning angle and ground motion peak acceleration are calculated. The relationships between them are statistically analyzed. Finally, the stochastic vibration theory is used to give an earthquake warning threshold evaluation table for the vehicles. © 2019, Nanjing Univ. of Aeronautics an Astronautics. All right reserved.
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页码：874 / 885
页数：11
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