FATIGUE TESTS OF PRESTRESSED GIRDERS WITH BLANKETED AND DRAPED STRANDS

In pretensioned girders, draping of strands can be avoided by using straight tendons having unbonded "blanketed" lengths at the ends of girders. 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 girders contained draped strands. The other girders had straight strands with four tendons blanketed at each end. The effects of load level, development length, and confining ties were investigated. The test program called for 5-million cycles of loading followed by a static test to destruction. The paper 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 pre-cracked beams where load level produced tensile stress in the precompressed concrete. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 13-21
  • Monograph Title: Bridge Engineering. Volume 2
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183775
  • Record Type: Publication
  • ISBN: 0309026970
  • Files: TRIS, TRB
  • Created Date: Dec 12 1978 12:00AM