United States Department of Transportation
i
Modeling the lateral load distribution for multiple concrete crossties and fastening systems.
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2017-01-31
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Abstract:The objective of this project was to further investigate the performance of concrete crosstie and
fastening system under vertical and lateral wheel load using finite element analysis, and explore
possible improvement for current track design standard. The damage of fastening system is one
of the most prevalent failure causes for concrete crosstie track, however the current AREMA
design standard only includes evaluative tests for the fastening system, rather than a mechanistic
design approach. To improve the current design approach, the vertical and lateral load path
through the track structure and the component demand within the concrete crosstie and fastening
system should be further investigated. The research work included the following tasks: 1) developing a detailed finite element model of
the prestressed concrete crosstie and fastening system based on the manufacturer’s design, 2)
validating the component models of the rail clip and the prestressed concrete crosstie based on
manufacturer’s information and crosstie flexural test, 3) validating the single-crosstie-fastening system
model based on laboratory experimentation, 4) validating the multiple crosstie model
based on the field experimentation conducted on instrumented track, 5) validating the multiple
crosstie model based on full-scale laboratory experimentation under asymmetric loading
scenarios, 6) using the validated FE model to conduct parametric studies about the failure
mechanisms of the concrete crosstie and fastening system, and the effect of critical design
parameters on the performance of the track structure.
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