Development of Knowledge in the Application of Strut-and-Tie Modeling

The research team will fill knowledge gaps in the 2017 AASHTO LRFD Bridge Design Specifications including but not limited to (1) strength of nodes in which tension fields in three orthogonal direction are present, (2) stress concentrations observed at curved bar nodes (locations where the reinforcing bars change direction) can be critical. The tighter the radius of the bend, the higher these stresses are. Development of design recommendations for this special class of CTT nodes has not yet occurred in the U.S., due to lack of supporting test data. (3) Triaxial confinement benefits offered by confining reinforcement have not been researched and codified. (4) AASHTO LRFD Bridge Design Specifications limit the spacing of crack control reinforcing to d/4 or 12 in, i.e., “d/4 limit”. This limit can be relaxed, if supported by experimental evidence.


  • English


  • Status: Completed
  • Funding: $999908
  • Contract Numbers:


  • Sponsor Organizations:

    Texas Department of Transportation

    11th and Brazos Streets
    Austin, TX  United States  78701

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Managing Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Dassi, Martin

  • Performing Organizations:

    Center for Transportation Research

    3925 W. Braker Lane
    Austin, TX  United States  78759
  • Principal Investigators:

    Bayrak, Oguzhan

  • Start Date: 20191216
  • Expected Completion Date: 20221231
  • Actual Completion Date: 20221231
  • Source Data: TxDOT Research Library

Subject/Index Terms

Filing Info

  • Accession Number: 01743939
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-7039
  • Files: RIP, STATEDOT
  • Created Date: Jun 24 2020 4:13PM