SOME OBSERVATIONS ON THE PRESTRESS LOSS BEHAVIOR OF BEAMS IN AN EXPERIMENTAL BRIDGE

This report presents the description and preliminary results through the first year of the work conducted under the research project entitled 'Evaluation of Prestress Loss Characteristics of In-Service Bridge Beams', (PennDOT Research Project 71-9, Lehigh University Project No. 382). By strain measurements on field stored specimens as well as control specimens stored in the laboratory, it was found that indoor specimens suffer somewhat higher shrinkage and creep strains than their outdoor counterpart. Little difference was observed between the members containing stabilized strands and those containing stress-relieved strands. The transfer length for 1/2 inch strands was observed to be approximately 30 inches. Also, preliminary examination indicated that the thermal prestress loss due to elevated curing temperature was completely recovered after the end of curing.

• Supplemental Notes:
  • Prepared in cooperation with Pennsylvania Dept. of Transportation, Harrisburg.
• Corporate Authors:

  Lehigh University

  Fritz Engineering Laboratory
  Bethlehem, PA  United States  18015

  Pennsylvania Department of Transportation

  Commonwealth and Forster Streets
  Harrisburg, PA  United States  17120

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Huang, T
  • Tansu, J
• Publication Date: 1975-7

Media Info

• Pagination: 75 p.

Subject/Index Terms

• TRT Terms: Beams; Bridge construction; Bridge foundations; Bridges; Concrete curing; Construction; Creep; Deflection; Field tests; Highway bridges; Prestressed concrete; Prestressing; Pretensioning; Relaxation (Mechanics); Shrinkage; Strain measurement
• Uncontrolled Terms: Prestress loss
• Old TRIS Terms: Beams (Support)
• Subject Areas: Bridges and other structures; Construction; Highways;

Filing Info

• Accession Number: 00143031
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: FEL-382.2 Intrm Rpt., FHWA/RD-76-S0503
• Files: NTIS, TRIS, USDOT, STATEDOT
• Created Date: Oct 6 1976 12:00AM