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Edition:Interim report; September 1976 - May 1977
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Abstract:This report was prepared as part of the Improved Track Structures Research Program
managed by the Transportation Systems Center. This program is sponsored by the
Office of Rail Safety Research, Improved Track Structures Research Division, of
the Federal Railroad Administration. The report presents results from a parametric
study of track response using a comprehensive track analysis model. Track response
parameters include rail and tie bending moments, rail displacement, tie rail seat
load, and the distribution of stresses in the ballast and subgrade. The effects of
variations in tie sîze, tie spacing, ballast depth and rail fastener stiffness are
presented in graphs suitable for track design trade-off studies. Alternative
wood and concrete tie track configurations are evaluated using equivalent maintenance
criteria.
Maintenance criteria for track surface deterioration were reviewed to select ballast
and subgrade stress parameters which can be related to track settlement rate for
service loads. Formats for cumulative settlement criteria are evaluated using
available laboratory data for the behavior of ballast and subgrade materials under
repeated loads. Track lateral
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