INVESTIGATING THE INFLUENCE OF AUXILIARY RAILS ON DY-NAMIC BEHAVIOR OF RAILWAY TRANSITION ZONE BY A 3D TRAIN-TRACK INTERACTION MODEL

Authors

  • HAMIDREZA HEYDARI NOGHABI IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY(IUST)
  • J. N. VARANDAS DEPT. OF CIVIL ENGINEERING, FCT, UNIVERSIDADE NOVA DE LISBOA
  • MORTEZA ESMAEILI IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY(IUST) HTTP://ORCID.ORG/0000-0002-8189-5584
  • JABBAR ALI ZAKERI IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY(IUST)

Keywords:

RAILWAY TRACK, TRANSITION ZONE OF SLAB TRACK TO BALLASTED TRACK, AUXIL-IARY RAILS, 3D TRAIN-TRACK INTERACTION MODEL

Abstract

ABRUPT TRACK VERTICAL STIFFNESS VARIATIONS ALONG RAILWAY TRACKS CAN LEAD TO INCREASED DYNAMIC LOADS, ASYMMETRIC DEFORMATIONS, DAM-AGED TRACK COMPONENTS, AND CONSEQUENTLY, INCREASED MAINTENANCE COSTS. THE JUNCTION OF SLAB TRACK AND BALLASTED TRACK IS ONE OF THE EXISTING AREAS WHERE VERTICAL TRACK STIFFNESS CAN SUDDENLY CHANGE, THEREFORE REQUIRING A TRANSITION ZONE THAT SMOOTHES THE TRACK STIFF-NESS CHANGE. ONE OF THE METHODS FOR CONSTRUCTING THE TRANSITION ZONE AT THE JUNCTION OF SLAB AND BALLASTED TRACKS IS TO INSTALL AUXILIARY RAILS ALONG THE TRANSITION ZONE. IN THE PRESENT STUDY, THE DYNAMIC BEHAVIOR OF THIS TYPE OF TRANSITION ZONE WAS EVALUATED BY A TRAIN-TRACK INTERACTION MODEL. FOR THIS PURPOSE, A 3D MODEL OF THE RAILWAY TRACK WAS MADE, REPRESENTING THE SLAB TRACK, THE TRANSITION ZONE, AND THE BALLASTED TRACK. THEN, THE MODELING RESULTS WERE VALIDATED BY THE RESULTS OF FIELD TESTS. AFTERWARDS, IN ORDER TO STUDY THE DY-NAMIC BEHAVIOR OF THE TRANSITION ZONE WITH AUXILIARY RAILS, DIFFERENT SENSITIVE ANALYSES, SUCH AS VEHICLE SPEED, VEHICLE LOAD, NUMBER OF AUXILIARY RAILS AND RAILPAD STIFFNESS, WERE PERFORMED WITH THE MOD-EL. THE OBTAINED RESULTS SHOWED THAT THE USE OF AUXILIARY RAILS RE-DUCED THE RAIL DEFLECTION VARIATIONS ALONG THE TRANSITION ZONE FROM 35% TO 28% FOR LOW AND MEDIUM SPEEDS (120, 200 KM/H), AND FROM 41% TO 33% FOR HIGH SPEEDS (300 KM/H).

Author Biographies

HAMIDREZA HEYDARI NOGHABI, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY(IUST)

SCHOOL OF RAILWAY ENGINEERING

IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

NARMAK TEHRAN 16846 IRAN

J. N. VARANDAS, DEPT. OF CIVIL ENGINEERING, FCT, UNIVERSIDADE NOVA DE LISBOA

DEPT. OF CIVIL ENGINEERING, FCT, UNIVERSIDADE NOVA DE LISBOA

MORTEZA ESMAEILI, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY(IUST)

SCHOOL OF RAILWAY ENGINEERING

IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

NARMAK TEHRAN 16846 IRAN

JABBAR ALI ZAKERI, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY(IUST)

SCHOOL OF RAILWAY ENGINEERING

IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

NARMAK TEHRAN 16846 IRAN

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Published

2017-08-26

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Articles