Design and Construction Specifications for Bonded and Unbonded Post-Tensioned Concrete Bridge Elements

Grouted tendons (bonded and unbonded) are predominantly used for post-tensioned concrete bridge elements in the United States. However, because of potential durability issues with grouted tendons, some highway agencies recently opted to use ungrouted tendons for post-tensioning to facilitate replacement. Combinations of bonded and unbonded tendons as well as internal and external tendons or combinations thereof are used for such applications. The American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (LRFD) Bridge Design Specifications address the design of post-tensioned concrete bridge elements. However, some design aspects pertaining to this variety of tendon applications are not adequately addressed or evaluated (e.g., shear and torsion for elements post-tensioned with unbonded internal tendons, combined unbonded internal and external tendons, or combined bonded and unbonded tendons; and shear and flexure for elements post-tensioned with combined bonded and unbonded tendons). Research is needed to review available information, perform necessary analytical and experimental evaluations, and propose revisions to the AASHTO LRFD Bridge Design Specifications and the AASHTO LRFD Bridge Construction Specifications, if necessary. These revisions will ensure appropriate consideration of the effects of tendon configuration on the design of post-tensioned concrete bridge elements. The objective of this research is to propose revisions to (1) the AASHTO LRFD Bridge Design Specifications design procedures for post-tensioned concrete bridge elements with unbonded tendons or a combination of bonded (pretensioned or post-tensioned) and unbonded tendons, and (2) the AASHTO LRFD Bridge Construction Specifications as needed. The research shall address both internal and external tendons.

Language

  • English

Project

  • Status: Proposed
  • Funding: $800000
  • Contract Numbers:

    Project 12-118

  • Sponsor Organizations:

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Hanna, Amir

  • Start Date: 20190311
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01672546
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 12-118
  • Files: TRB, RiP
  • Created Date: Jun 18 2018 3:03PM