SHEAR STRENGTHENING OF CONCRETE BRIDGE GIRDERS USING CARBON FIBER-REINFORCED PLASTIC SHEETS

Many older reinforced or prestressed concrete bridges designed in accordance with now obsolete design codes and for much lighter traffic loads have been found to be shear deficient. It is of great interest to develop rehabilitation techniques that are both structurally efficient and economically competitive. The main objective of the research program was to investigate the feasibility of strengthening concrete bridge girders for shear using carbon fiber-reinforced plastic (CFRP) sheets bonded externally to the webs of the girders. The advantages of such advanced composite materials include their high tensile strength, noncorrosive properties, light weight, and small sectional dimensions, all of which make them competitive with more traditional materials for use in rehabilitation applications. Three precast reinforced concrete bridge girders 9.1 m long, hat-shaped in section, were salvaged from a demolished bridge that had originally been constructed in the late 1950s. CFRP sheets were bonded to the vertical web faces in various arrangements, the members were tested to failure, and the results were compared with those associated with the unstrengthened condition. Shear failure was governed by the strength of the concrete rather than by the CFRP material, and the behavior indicated that anchorage of the sheets is a key consideration. The results showed an increase in shear capacity of between 21 and 55%. On the basis of the test results, mechanisms were proposed by which the bonded CFRP sheets contributed to the shear strength of the section, and a method was suggested for calculating this contribution.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 337-347
  • Monograph Title: FOURTH INTERNATIONAL BRIDGE ENGINEERING CONFERENCE, SAN FRANCISCO, CALIFORNIA, AUGUST 28-30, 1995. CONFERENCE PROCEEDINGS, 2 VOLUMES
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00711702
  • Record Type: Publication
  • ISBN: 0309061091
  • Files: TRIS, TRB
  • Created Date: Sep 5 1995 12:00AM