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Investigation and Prediction of Stiffness Increase of Resilient Rail Pad due to Train and Environmental Load in High-Speed Railway

[+] Author Affiliations
Eun Kim, Sin Chu Yang, Seung Yup Jang

Korea Railroad Research Institute, Uiwang, Gyeonggi-do, Korea

Paper No. JRC2015-5789, pp. V001T01A035; 6 pages
  • 2015 Joint Rail Conference
  • 2015 Joint Rail Conference
  • San Jose, California, USA, March 23–26, 2015
  • Conference Sponsors: Rail Transportation Division
  • ISBN: 978-0-7918-5645-1
  • Copyright © 2015 by ASME


The rail pad stiffness is one of key design parameters of the track structure, affecting the load distribution along the rail and the dynamic behavior of the track. The rail pad stiffness, however, can be increased under accumulated train load and environmental load, i.e., temperature change, due to the nature of resilient rubber. This study investigates the causes and prediction model of the stiffness increase of the resilient rail pads used in the ballasted and concrete slab track in high-speed railway. For this purpose, in-situ rail pads were taken from several sites, and the static and dynamic stiffness was measured. Also, the repeated load test and accelerated heat aging test on new rail pads in the laboratory have been performed. Based on the test data, proposed is a mathematical model for predicting the increase of the rail pad stiffness according to passing tonnage and elevated temperature.

Copyright © 2015 by ASME



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