Automated System for Concrete Crosstie Transfer Length Measurement

This research result was part of a larger project entitled, “Quantifying the Effect of Prestressing Steel and Concrete Variables on the Transfer Length in Pretensioned Concrete Crossties,” conducted by Kansas State University (KSU) and sponsored by the Federal Railroad Administration (FRA). This report documents the advances made to determine the transfer length of pretensioned concrete railroad ties using non-contact (optical) strain measurement and digital image correlation. The full technical report can be downloaded from the K-State Research Exchange. The work produced two, fully functional, longitudinal strain measurement and transfer length assessment devices that address specific needs of the industry. The devices are: (1) an automated computer-controlled traversing device and (2) a 6-camera stationary strain field measurement system. In addition to controlled laboratory testing, KSU researchers extensively field-tested both devices in actual tie plants. Performance results are compared here both in terms of longitudinal strain profile measurement capability and in the devices’ ability to accurately assess transfer length.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References;
  • Pagination: 5p
  • Serial:
    • Research Results
    • Issue Number: RR 21-17
    • Publisher: Federal Railroad Administration
  • Publication flags:

    Open Access (libre)

Subject/Index Terms

Filing Info

  • Accession Number: 01781553
  • Record Type: Publication
  • Created Date: Sep 12 2021 6:21PM