RES2013-35: Load Rating of Concrete Culverts in Tennessee Under New Emergency Vehicle Loads

The Fixing America’s Surface Transportation Act changed the existing weight limit restrictions for highway vehicles. The new restrictions allow for emergency vehicles to traverse highways without acquiring permits. The FHWA has now required state transportation departments to load rate all structures within a mile of the interstate system for two new loading configurations. The configurations are named EV2 and EV3 and are evaluated as legal loads per the LRFR method. The FHWA also developed a new load posting procedure based on the rating results of the new emergency vehicle configurations. The main objective of this research project was to compile a database of culvert ratings for new emergency vehicle loading to determine the effects of new emergency vehicle loads on culverts in Tennessee. TDOT provided all pertinent culvert information. Structural computer models for all of the culverts were built using the software program AASHTOWare. The culverts were load rated for different loading configurations. Upon completion of load rating the culverts affected by new emergency vehicles, it was found that all EV3 ratings and some EV2 ratings were less than HL-93 operating ratings. Some culverts’ ratings are sufficient for HL-93 loading, but are insufficient for the new emergency vehicle loading. EV2 and EV3 are heavier and shorter than HL-93 loading, and they are not compliant with federal bridge formula B weight restrictions. The new emergency vehicle load posting procedure and the relatively smaller EV2 and EV3 load ratings significantly impact recommended load postings for culverts in Tennessee. The correlations found between HL-93 and emergency vehicle load ratings are strong and can be used to reasonably estimate EV2 and EV3 ratings when HL-93 ratings are available.

Language

  • English

Project

  • Status: Completed
  • Funding: $128613
  • Contract Numbers:

    RES2013-35

  • Sponsor Organizations:

    Tennessee Department of Transportation

    James K. Polk Building
    Fifth and Deaderick Street
    Nashville, TN  United States  37243-0349
  • Managing Organizations:

    Tennessee Department of Transportation

    James K. Polk Building
    Fifth and Deaderick Street
    Nashville, TN  United States  37243-0349
  • Performing Organizations:

    Tennessee Tech University

    Department of Civil and Environmental Engineering
    1020 Stadium Drive Box.5015
    Cookeville, TN  United States  38505
  • Principal Investigators:

    Huo, X

  • Start Date: 20130613
  • Expected Completion Date: 20190330
  • Actual Completion Date: 0
  • USDOT Program: Transportation, Planning, Research, and Development

Subject/Index Terms

Filing Info

  • Accession Number: 01762878
  • Record Type: Research project
  • Source Agency: Tennessee Department of Transportation
  • Contract Numbers: RES2013-35
  • Files: RIP, STATEDOT
  • Created Date: Jan 28 2021 2:09PM