ON THE RELATIONSHIP BETWEEN LOAD AND DEFLECTION IN RAILROAD TRACK STRUCTURE

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Manuela
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ON THE RELATIONSHIP BETWEEN LOAD AND DEFLECTION IN RAILROAD TRACK STRUCTURE

Mensagem por Manuela » 05 Set 2016, 11:16

Autores: Sheng Lu, Richard Arnold, Shane Farritor, Mahmood Fateh, Gary Carr.

ABSTRACT:
Track Modulus, defined as ratio between the rail deflection and the vertical contact pressure between the rail base
and track foundation, is an important parameter in determining track quality and safety. The Winkler model is a
widely used mathematical expression that relates track modulus to rail deflection. The Winkler model represents
railroad track as an infinitely long beam (rail) on top of a uniform, linear, and elastic foundation. The contact
pressure between the rail base and track foundation increases linearly with vertical deflection. However, it is widely
accepted that actual track deflection is highly non-linear. Several other models have been used to better represent
the behavior of railroad track structure including a model that includes a shear layer and one that uses discrete
supports.
This paper presents a new model of track deflection where the elastic foundation beneath the rail has a cubic
polynomial relationship between applied pressure and vertical deflection. This new cubic model is compared to
other models of railroad track structure, including the Winkler, Pasternak, and Discrete Support models, as well as
with experimental data. It is shown that the cubic model is a better representation of real track structure.
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