00611106

Component

http://onlinepubs.trb.org...trr/1991/1289/1289-004.pdf

https://scholar.google.co...Kish&publication_year=1991

Techniques and hardware for field measurement of two important continuous welded rail (CWR) track parameters for safety from buckling--the track lateral resistance and the rail neutral temperature--are presented. It is shown here that by controlling the two parameters above their respective permissible minimum values, CWR track buckling safety can be ensured. For the measurement of lateral resistance, a lightweight, portable device that tests the ties individually has been developed. Field data collected using the single-tie push test revealed that the scatter is within permissible limits if the data for three randomly selected ties in a 50-ft section of CWR are averaged. The data have also shown that the ties exhibit a softening resistance characteristic, a feature that has been ignored or not detected in work by other researchers. Rail neutral temperature can be measured using the principle that the vertical deflection of a rail beam freed from ties is measurably sensitive to the longitudinal rail force when a vertical load is applied to the rail section. On the basis of that principle a rail uplift device (RUD) that gives the absolute rail force without site-specific calibration has been developed. The rail force test data from RUD are in agreement with the theoretical predictions.

This paper appears in Transportation Research Record No. 1289, Lateral Track Stability 1991: Proceedings of a Conference, May 15-17, 1990, St. Louis, Missouri. 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

01411122

p. 39-52

1991

Transportation Research Record

Conference on Lateral Track Stability, 1990, St Louis, Missouri, USA

0309050685

Figures (15) ; Photos (3) ; References (10) ; Tables (2)

Buckling; Continuous welded rail; Field tests; Railroad tracks; Safety; Temperature

Field measurements

Design; Highways; Railroads; Safety and Human Factors

TRIS, TRB

Jul 31 1991 12:00AM

• DYNAMIC BUCKLING OF CONTINUOUS WELDED RAIL TRACK: THEORY, TESTS, AND SAFETY CONCEPTS
• EFFECTIVENESS OF SOUTHERN PACIFIC LINES IN CONTROLLING THE BEHAVIOR OF CONTINUOUS WELDED RAIL TRACK
• EFFECTIVENESS OF VARIOUS SCHEMES IN CONTROLLING THE BEHAVIOR OF CONTINUOUS WELDED RAIL
• LATERAL TRACK STABILITY: HOW SANTA FE RAILWAY ACHIEVES IT TODAY
• LATERAL TRACK STABILITY: THEORY AND PRACTICE IN JAPAN
• MAINTENANCE PROCEDURES FOR LATERAL TRACK STABILITY
• METHODS AND PROCEDURES FOR LAYING AND MAINTAINING CONTINUOUS WELDED RAIL TO ATTAIN LATERAL TRACK STABILITY
• RAILWAYS OF AUSTRALIA TRACK BUCKLING PROJECT
• THIRTY YEARS OF EXPERIENCE WITH CONTINUOUS WELDED RAIL ON THE FRENCH NATIONAL RAILROADS
• UNION PACIFIC'S APPROACH TO PRESERVING LATERAL TRACK STABILITY