FATIGUE TESTS OF FULL-SIZE-PRESTRESSED GIRDER

An experimental investigation was carried out to determine the effect of repetitive loading on the behavior and strength of girders with draped and blanketed strands. Six full-size Type II AASHTO-PCI girders were tested. Two griders contained draped strands. The other girders had straight strands with four tendons blanketed at each end. Controlled variables in the test program were load level, development length, and use of ties to confine the concrete in the stress transfer region of the blanketed strands. The test program called for 5-million cycles of loading between dead load and dead load plus live load. Static tests to full dead load plus live load were performed before cyclic loading and after 1, 2-1/2 and 5-million cycles. At the completion of 5-million cycles, the girders were tested to destruction under static load. The report presents results of the investigation and shows that blanketed strands can be used successfully if adequate strand development length is provided. Fatigue fracture of strands was observed in precracked beams where load level produced tensile stress in the precompressed concrete. /FHWA/

  • Supplemental Notes:
    • Sponsored by Louisiana Department of Transportation and Development in cooperation with U.S. Department of Transportation, Federal Highway Administration.
  • Corporate Authors:

    Portland Cement Association

    5420 Old Orchard Road
    Skokie, IL  USA  60077
  • Authors:
    • Rabbat, B G
    • Kaar, P H
    • Russell, H G
    • Bruce Jr, R N
  • Publication Date: 1978-6

Media Info

  • Pagination: n.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00193734
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-LA-78-206P Final Rpt., FCP 45F3-152
  • Contract Numbers: 736-03-41
  • Files: TRIS, USDOT
  • Created Date: Aug 15 1979 12:00AM