Prestress Losses In UHPC And Hybrid Precast, Prestressed Bridge Girders

Precast, prestressed concrete bridge girders are used extensively in conventional and accelerated bridge construction. As longer span girders are desired to reduce the number of supports and improve speed of construction the impacts of high prestressing force on the end regions of the beams become more significant. End region behavior of prestressed concrete girders has been a significant concern warranting numerous studies over the years focused on stress limits, prestress transfer length, cracking caused by the prestress, and shear capacity. Ultra-high performance concrete (UHPC) is a relatively recent advancement in cementitious composite materials with mechanical and durability properties far exceeding those of conventional concrete. These improved mechanical properties have the potential to mitigate the impacts of high stresses in prestressed girder end regions and to provide greater overall girder capacity. In addition, UHPC has the potential to increase the overall durability of these prestressed girders if used in areas of high exposure. However, little research has been conducted on the behavior of hybrid girders using UHPC in the end region or as a stay-in-place formwork shell. The proposed project will leverage results obtained through Oklahoma DOT support on long term behavior of full UHPC prestressed girders to design and evaluate time dependent behavior and strength of hybrid conventional self-consolidating concrete and UHPC girders. A total of 10 prestressed girders will be cast, instrumented, and tested and the results used to develop predictions for prestress loss behavior and recommendations for girder detailing.

Language

• English

Project

• Status: Active
• Funding: $90000
• Sponsor Organizations:

  Accelerated Bridge Construction University Transportation Center (ABC-UTC)

  Florida International University
  10555 W. Flagler Street
  Miami, FL  United States  33174

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Performing Organizations:

  University of Oklahoma, Norman

  School of Civil Engineering and Environmental Science
  202 West Boyd Street, Room 334
  Norman, OK  United States  73019
• Start Date: 20240102
• Expected Completion Date: 20241231
• Actual Completion Date: 0
• USDOT Program: University Transportation Centers

Subject/Index Terms

• TRT Terms: Concrete bridges; Girders; Prestressed concrete; Ultra high performance concrete
• Subject Areas: Bridges and other structures; Construction; Highways; Materials;

Filing Info

• Accession Number: 01924835
• Record Type: Research project
• Source Agency: Accelerated Bridge Construction University Transportation Center (ABC-UTC)
• Files: UTC, RIP
• Created Date: Jul 21 2024 2:56PM