UDOT's Calibration of AASHTO's New Prestress Loss Design Equations

In the next edition of the AASHTO LRFD Bridge Design Specifications the procedure to calculate prestress losses will change dramatically. The new equations are empirically based on high performance concrete from four states (Nebraska, New Hampshire, Texas and Washington). The material testing resulted in modified equations to predict elastic shortening, shrinkage and creep. Because high performance concrete has traditionally resulted in smaller prestress losses these new equations also estimate lower losses in comparison to the existing equations. Many of the bridges built in Utah do not use specifically high performance concrete, but a self consolidating concrete that is different than the mixes that were used to develop the new AASHTO equations. Appropriate design parameters need to be established in order to apply them in the new AASHTO LRFD prestress loss calculations. This report summarizes the calibration of the AASHTO prestress loss equations for the Utah Department of Transportation.

• Record URL:
  https://drive.google.com/file/d/1KAX22MqQWFc7yfZNyuojh-ZeAMUvXV52/view?usp=sharing
• 
• Corporate Authors:

  Utah State University, Logan

  Department of Civil and Environmental Engineering, 4110 Old Main Hill
  Logan, UT  United States  84322-4110

  Utah Department of Transportation

  4501 South 2700 West
  Salt Lake City, UT  United States  84114-8410

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Barr, Paul J
  • Halling, Marvin W
  • Boone, Shane D
  • Toca, Raul
  • Angomas, Franklin
• Publication Date: 2009-7

Language

• English

Media Info

• Media Type: Web
• Edition: Final Report
• Features: Figures; Photos; References; Tables;
• Pagination: 66p

Subject/Index Terms

• TRT Terms: Calibration; Equations; High performance concrete; Self compacting concrete
• Identifier Terms: AASHTO LRFD Bridge Design Specifications
• Uncontrolled Terms: Prestress losses
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01139405
• Record Type: Publication
• Report/Paper Numbers: UT-09.10, UTCM 09-10
• Contract Numbers: 079114
• Files: TRIS, USDOT, STATEDOT
• Created Date: Sep 1 2009 8:29AM