New Definition of Neutral Temperature in Continuous Welded Railway Track Curves

  • Jabbar Ali Zakeri Associate Professor, School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran
  • Meraj Barati Iran University of Science and Technology, Tehran, Iran
  • Saeed Mohammadzadeh Iran University of Science and Technology, Tehran, Iran

Abstract

Changes in axial force for control and prevent track buckling are vital to know the natural temperature. Thermal neutral temperature actually refers to the railway tracks where there is no pressure and no traction, or in other words the axial force is zero in rails. In this paper, the new definition for variations in neutral and float temperatures in Continuous welded Rail (CWR) is proposed as a function of media temperature, lateral track stiffness (or lateral displacement of the track). The neutral temperature is selected with respect to minimum and maximum temperatures in the region where the railway installed.
In this research, a case study with field tests has been used and computer modeling to prove this purport(idea) for a curve of radius 250 m with a length of about 145 m. In field test explained the relation between rail and media temperature and this item helps to modeling track to comprehend when lateral track resistance to be change, variation in neutral temperature how to change.

Keywords

neutral temperature, buckling rail tracks, axial rail forces
Published in Onlinefirst
26-06-2017
How to Cite
ZAKERI, Jabbar Ali; BARATI, Meraj; MOHAMMADZADEH, Saeed. New Definition of Neutral Temperature in Continuous Welded Railway Track Curves. Periodica Polytechnica Civil Engineering, [S.l.], v. 62, n. 1, p. 143-147, 2018. ISSN 1587-3773. Available at: <https://pp.bme.hu/ci/article/view/8505>. Date accessed: 23 nov. 2017. doi: https://doi.org/10.3311/PPci.8505.
Section
Research Article