CONCRETE BEAMS PRESTRESSED WITH CFRP

Carbon fiber reinforced polymers (CFRPs) show potential for use as reinforcing elements in concrete structures. This study examines the shear responses of box beams with CFRP reinforcement. The shear cracking load and ultimate load-carrying capacity of six tested box beams are presented. The beams, except for one control beam, were fitted with steel or CFRP stirrups at different spacing intervals. Results showed that shear strength of box beams reinforced with CFRP stirrups was slightly higher than the one reinforced with steel stirrups due to higher values of induced effective stresses in the CFRP stirrups. However, shear cracking occurred at higher loads with the steel stirrups. Stirrups with greater center-to-center spacing experienced higher strains at beam failure. Shear cracking force for the beam with steel stirrups was significantly higher than the cracking forces for beams with CFRP stirrups at the same spacing. The shear failure of each box beam was accompanied by widening of the shear cracks, followed by rupture of the pretensioning tendons.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 60-64
  • Serial:
    • Concrete International
    • Volume: 27
    • Issue Number: 2
    • Publisher: American Concrete Institute (ACI)
    • ISSN: 0162-4075

Subject/Index Terms

Filing Info

  • Accession Number: 00986648
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 15 2005 12:00AM