BEHAVIOR OF UNTENSIONED-BONDED PRESTRESSING STRAND

The fatigue resistance of the untensioned-bonded prestressing strand in a configuration consistent with the bent strand connection for a precast I-Beam bridge was examined. Two specimen types were tested. The first specimen type (single specimen) had two overlapping strands bent at 90 degrees over a reinforcing bar and cast in a single block of concrete. The opposing strands were gripped and loaded in a near axial condition. The second specimen type (double specimen) consisted of a single strand bent into a U shape with opposing sections of the strand cast in two separate concrete blocks. The load was transferred to the strand through the concrete portion of the specimen. The failure mode for all specimens was determined to be fracture of the strand, therefore test variables were limited to stress range in the strand. An S-N curve was developed for stress range variation from 68.8% to 12.5%. Design recommendations were developed for the bent strand reinforcement in the end connection for resistance to volume change forces in I-Beam bridges. (FHWA)

  • Record URL:
  • Corporate Authors:

    University of Missouri, Columbia

    Department of Civil Engineering, 2509 Engineering Building East
    Columbia, MO  United States  65211

    Missouri Highway and Transportation Department

    Highway and Transportation Building
    Jefferson City, MO  United States  65101

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Salmons, J R
  • Publication Date: 1980-6

Media Info

  • Pagination: 73 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00345086
  • Record Type: Publication
  • Report/Paper Numbers: FHWA-RD-77- 1 Final Rpt., FCP 45F3-732
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Jan 29 1982 12:00AM