高速铁路地震残余轨道不平顺的分布模式
Distribution mode of seismic residual track irregularity for high-speed railway
余建 1蒋丽忠 1周旺保 1刘祥2
作者信息
- 1. School of Civil Engineering,Central South University,Changsha 410075,China
- 2. School of Civil Engineering,Fujian University of Technology,Fuzhou 350118,China
- 折叠
摘要
铁路运输作为抗震救灾的重要生命线,在抗震救灾期和灾后重建期承担了极其重要的运输任务,研究地震引起的轨道不平顺是保证震后行车安全的基础.本文基于ANSYS有限元平台建立了带轨道系统的高速铁路桥梁有限元模型,从强震数据库中筛选出随机地震并对有限元模型开展了非线性时程分析,归纳了震后轨向不平顺的分布模式;基于MATLAB建立了列车-轨道-桥梁系统耦合模型,分析了列车在不同轨向不平顺模式下的动力响应差异,提出了震后轨向不平顺的最不利分布模式及其数学模型,计算了震后行车的速度阈值.研究结果表明:横向地震作用后,钢轨产生了明显的轨向不平顺,但高低不平顺的幅值较小;轨向不平顺的分布模式可以分成单峰不平顺和双峰不平顺,双峰不平顺的最大幅值以及产生的列车响应均明显小于单峰不平顺;单峰不平顺可以由震时轨向不平顺峰值、峰值衰减系数、形状修正系数和正弦函数的乘积进行模拟;当横向地震的PGA小于0.25g时,震后的列车行驶无需减速,当PGA大于0.25g时,列车需要适当减速以满足舒适性要求.
Abstract
As a significant lifeblood during earthquake mitigation and post-earthquake reconstruction, railway transportation undertakes crucial tasks. Research on track irregularity induced by earthquakes lays the foundation for driving safety after earthquakes. A total of eighty arbitrary seismic records were chosen, and the distribution mode of seismic residual alignment irregularity was summarized. The differences in vehicle vibration under different distribution modes were analyzed. A target seismic residual track irregularity based on the distribution mode analysis was proposed, and the driving speed threshold after earthquakes was calculated. The research results show that under the action of transverse earthquakes, rails suffer an obvious alignment irregularity, that the amplitude of vertical irregularity is small, and that the distribution mode of alignment irregularity can be divided into unimodal and bimodal irregularities. Both the maximum amplitude of bimodal irregularity and the generated vehicle response are significantly smaller than those corresponding to unimodal irregularity. The latter could be simulated by the product of amplitude of track alignment during earthquakes, attenuation coefficient, shape correction coefficient and sine function. When the peak acceleration of transverse earthquakes is less than 0.25g, there is no need for the vehicle to slow down, whereas when it is larger than 0.25g, the vehicle needs to slow down moderately to meet the comfort requirements.
关键词
随机地震/高速铁路/轨道不平顺/震后行车/车辆振动Key words
random earthquakes/high speed railways/track irregularity/driving after earthquakes/vehicle vibration引用本文复制引用
基金项目
National Natural Science Foundation of China(U1934207)
National Natural Science Foundation of China(52078487)
National Natural Science Foundation of China(51778630)
Innovative Provincial Construction Project of Hunan,China(2019RS3009)
Fundamental Research Funds of the Central Universities,China(2022ZZTS0150)
出版年
2023
NETL
NSTL
维普
万方数据