United States Department of Transportation
i
Analysis for lateral deflection of railroad track under quasi-static loading
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2013-10-15
[PDF-1.38 MB]
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Alternative Title:Proceedings of the ASME 2013 Rail Transportation Division Fall Technical Conference
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Abstract:This paper describes analyses to examine the lateral
deflection of railroad track subjected to quasi-static loading.
Rails are assumed to behave as beams in bending. Movement
of the track in the lateral plane is constrained by idealized
resistance characteristics, while movement in the vertical plane
is resisted by a continuous, linear and elastic foundation. These
analyses are based on solving the ordinary differential equations
for beam deflections. In certain cases, convenient mathematical
expressions may be used to represent idealized lateral resistance
characteristics and derive closed-form equations to relate lateral
force as a function of track lateral deflection. However, in
general, the idealized lateral resistance characteristic may be
nonlinear, in which case numerical methods are required to
examine the lateral load versus track lateral deflection behavior.
In these general cases, a Fourier series technique is used to
solve the governing equations numerically.
The analysis of track lateral deflection subjected to quasistatic
loads may be applied to examine track shift. For
example, lateral resistance of track may be measured using
Track Lateral Pull Tests (TLPT). The Fourier method is also
used to examine the relationship between lateral and vertical
wheel loads and track lateral shift.
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