Volume 23 Issue 3
Jun.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(3): 127-136
GAO Xiao-gang, FENG Qing-song, MA Yu-fei, WANG An-bin, SUN Hai-bo. Stiffness characteristics and life prediction of rail pads of subway damping fasteners[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 127-136. doi: 10.19818/j.cnki.1671-1637.2023.03.009
Citation: GAO Xiao-gang, FENG Qing-song, MA Yu-fei, WANG An-bin, SUN Hai-bo. Stiffness characteristics and life prediction of rail pads of subway damping fasteners[J]. Journal of Traffic and Transportation Engineering, 2023, 23(3): 127-136. doi: 10.19818/j.cnki.1671-1637.2023.03.009
shu

Stiffness characteristics and life prediction of rail pads of subway damping fasteners

doi: 10.19818/j.cnki.1671-1637.2023.03.009
  • 1.

    State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, Jiangxi, China

  • 2.

    School of Urban Railway Transportation, Shanghai University of Engineering Science, Shanghai 201620, China

  • 3.

    Nanjing Metro Operation Co., Ltd., Nanjing 210012, Jiangsu, China

Funds:

National Natural Science Foundation of China U1834201

National Natural Science Foundation of China 51878277

National Natural Science Foundation of China 52068029

More Information
  • Author Bio:

    GAO Xiao-gang(1980-), male, assistant professor, doctoral student, xgg728@163.com

    FENG Qing-song(1978-), male, professor, PhD, fqshdjtdx@aliyun.com

  • Received Date: 2022-12-23
    Available Online: 2023-07-07
  • Publish Date: 2023-06-25
    Abstract
  • In order to study the stiffness sensitivity of rail pads of subway damping fasteners in service and their influence on line environmental vibration, the compression-type damping fasteners extracted from several operating lines of Nanjing Metro were taken as the research object, and the multi-environmental indoor comprehensive tests of the stiffness characteristics, fatigue characteristics at room temperature, and thermal accelerated fatigue aging characteristics of rail pads of the compression-type fasteners in service were carried out. Based on the test results, the correlations between service time and stiffness change of rail pads of new and old compression-type fasteners were compared and analyzed. The time-life characteristic curves of rail pads were obtained, and the life prediction model for the percentage change in stiffness and service time of the rail pads was proposed. Research results indicate that under the combined effect of periodic wheel-rail loads and the temperature, humidity, and alkaline environment of the line, the service stiffness of rail pads of the subway damping fasteners increases linearly with service time, and the elasticity of rail pads undergoes performance degradation. The stiffness curve trend of the new rail pads under thermal accelerated fatigue aging is basically consistent with the stiffness curve trend of the sampled rail pads in service. In other words, the thermal accelerated cyclic aging test of the rail pads can simulate or evolve on-site conditions such as the thermal mechanical cyclic load of the line. Based on the Arrhenius life-stress thermal accelerated aging model, the acceleration factors of rail pads under service stress and accelerated aging stress are 1.99 and 1.36, respectively, which can be used to predict the replacement cycle of rail pads of the damping fasteners.

     

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