Engineering studies on joint bar integrity, part II : finite element analysis
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2014-04-02
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Alternative Title:Proceedings of the 2014 Joint Rail Conference, April 2-4, 2014, Colorado Springs, CO.
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Abstract:This paper is the second in a two-part series describing
research sponsored by the Federal Railroad Administration
(FRA) to study the structural integrity of joint bars. In Part I,
observations from field surveys of joint bar inspections
conducted on revenue service track were presented [1]. In this
paper, finite element analyses are described to examine the
structural performance of rail joints under various loading and
tie-ballast support conditions. The primary purpose of these
analyses is to help interpret and understand the observations
from the field surveys.
Moreover, the finite element analyses described in this
paper are applied to conduct comparative studies and to assess
the relative effect of various factors on the structural response
of jointed rail to applied loads. Such factors include: discrete
tie support (i.e. supported joint versus suspended joint with
varying spans between effective ties), bolt pattern (four versus
six bolts), initial bolt tension, and easement. In addition, results
are shown for 90 lb rail joined with long-toe angle bars
compared to 136 lb rail joined with standard short-toe joint
bars.
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