Development of a 3D FEM Model for Concrete Tie and Fastening Systems

This project conducted detailed finite element (FE) modeling of the concrete crosstie and fastening system to better understand the mechanisms through which loads transfer within various track components in the lateral direction. This was completed by quantifying the following important design and performance parameters: (1) What are the loading demands that originate at the wheel-rail interface? (2) How is the load transferred to the individual track superstructure components? (3) What is the lateral load path within the track system? In the initial stage of this project, critical input and output parameters that serve as guidelines for FE analysis were determined based on existing literature and experience from within the railroad industry. Laboratory and field instrumentation techniques were designed to extract measurements of the critical outputs in the laboratory and field environment, and the FE model was employed to predict responses of the track system. After the collection of test data, the FE modeling predictions were compared with the experimental data to verify the assumptions and simplifications included in the model. To improve the credibility of the FE models, the model validation was conducted in a hierarchical fashion based on experiments at different levels. After the validation of models, parametric studies based on the critical inputs and outputs were conducted. In this process the correlation between inputs and outputs were evaluated, and possible alternatives to the current design of concrete crossties and fastening systems were compared. The results of the parametric analyses serve as the basis for the proposed mechanistic design approach.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Figures; Photos; References; Tables;
  • Pagination: 26p

Subject/Index Terms

Filing Info

  • Accession Number: 01599254
  • Record Type: Publication
  • Report/Paper Numbers: NURail2012-UIUC-R04
  • Contract Numbers: DTRT12-G-UTC18
  • Files: UTC, NTL, TRIS, RITA, ATRI, USDOT
  • Created Date: Apr 26 2016 10:16AM