00300671

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http://onlinepubs.trb.org...s/trr/1978/694/694-004.pdf

https://scholar.google.co...YANG&publication_year=1978

One disadvantage of continuously welded rails is that the possibility of track buckling because of temperature increases is increased significantly by the elimination of rail joints. Many mathematical models have been developed for the buckling of tangent tracks, but there are very few that deal with curved tracks. The objective of this paper is the development of methods for the prediction of both the lateral thermal-buckling load and the corresponding displacement of curved tracks so that criteria for track design, maintenance, and evaluation can be formulated. This objective has been achieved by using a two-dimensional finite-element model that simulates the lateral stability of a track subjected to temperature increases and train wheel loads. This paper illustrates only the basic applications and the potential of the model. A parameter investigation was made that included tracks that had curvatures varying from 0 to 10 deg and studied the effects of various track parameters on the buckling temperature and the lateral track displacement. The results indicate that the buckling temperature and lateral displacement of a curved track are significantly affected by changes in lateral ballast resistance, misalignment and curvature, and by the presence of ineffective ties. The model provides a promising new approach to the track-buckling problem; however, test data are needed to validate it.

Publication of this paper sponsored by Committee on Track Structure System Design. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

01411530

pp 24-29

1978

Transportation Research Record

030902840X

Print

Figures (15) ; References (23) ; Tables (1)

Ballast (Railroads); Buckling; Curved track; High temperature; Mathematical models; Mechanical properties; Railroad tracks; Welded rail

Lateral stability

Bridges and other structures; Highways; Railroads

TRIS, TRB

Sep 29 1979 12:00AM

• ANALYTICAL AND EXPERIMENTAL STUDY OF RESIDUAL STRESS IN RAILS
• BALLAST AND SUBGRADE RESPONSE TO TRAIN LOADS
• DEVELOPMENT OF MULTILAYER ANALYSIS MODEL FOR TIE-BALLAST TRACK STRUCTURES
• EFFECTS OF ENERGY-COST VARIATION ON FEASIBILITY OF ELECTRIFYING THE CINCINNATI-ATLANTA MAIN LINE OF THE SOUTHERN RAILWAY SYSTEM
• INTRODUCTION TO STRESSES IN RAILS: STRESSES IN MIDRAIL REGIONS
• PERMANENT-DEFORMATION BEHAVIOR OF RAILWAY BALLAST
• PREDICTION OF FATIGUE CRACK GROWTH IN RAILROAD RAILS
• STATISTICAL DESCRIPTION OF SERVICE LOADS FOR CONCRETE CROSSTIE TRACK
• TECHNIQUES FOR EVALUATING EFFECTS OF TRACK AND VEHICLE WEAR ON FREIGHT-CAR PERFORMANCE