Use of 0.7-in. Diameter Strands in Precast Pretensioned Girders

Long-span bridges are often used in environmentally sensitive terrains, water crossings, and in locations with traffic and geometric restrictions. Bridges with long-span precast pretensioned girders are advantageous due to their ease and speed of construction, lower cost, and long-term durability. The use of 0.7-in. diameter strands would help bridge designers extend the spans of the existing girder shapes. However, the current AASHTO bridge design and construction specifications do not address the use of 0.7-in. diameter strands for precast prestressed girders. Bridge owners, fabricators, and contractors need specifications and guidelines to implement the use of 0.7-in. diameter strands in practice. The objectives of this research were to develop: (1) proposed modifications to the AASHTO LRFD Bridge Design Specifications and the AASHTO LRFD Bridge Construction Specifications to incorporate the use of 0.7-in. diameter strands in precast pretensioned girders for various span lengths; (2) guidelines for precast pretension girder fabrication using 0.7-in. diameter strands; and (3) guidelines for handling, shipping, and erection of long-span girders.


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  • Status: Completed
  • Funding: $550000
  • Contract Numbers:

    Project 12-109

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway & Transportation Officials (AASHTO)

    444 North Capitol Street, NW, Suite 225
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Dekelbab, Waseem

  • Performing Organizations:

    University of Cincinnati

    2600 Clifton Avenue
    Cincinnati, OH  United States  45221
  • Principal Investigators:

    Shahrooz, Bahram

  • Start Date: 20161116
  • Expected Completion Date: 20211215
  • Actual Completion Date: 20211215
  • Source Data: RiP Project 40205

Subject/Index Terms

Filing Info

  • Accession Number: 01572345
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 12-109
  • Files: TRB, RIP
  • Created Date: Aug 6 2015 1:00AM