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.

• Record URL:
  http://apps.trb.org/cmsfeed/TRBNetProjectDisplay.asp?ProjectID=4041

Language

• English

Project

• 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

• TRT Terms: Bridge construction; Bridge design; Bridge superstructures; Fabrication; Girders; Guidelines; Load and resistance factor design; Long span bridges; Optimization; Precast concrete; Pretensioning
• Identifier Terms: AASHTO LRFD Bridge Construction Specifications; AASHTO LRFD Bridge Design Specifications
• Subject Areas: Bridges and other structures; Construction; Design; Highways;

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