Fatigue of Diagonally Cracked RC Girders Repaired with CFRP
Publication: Journal of Bridge Engineering
Volume 13, Issue 1
Abstract
Fiber-reinforced polymers (FRP) are becoming more widely used for repair and strengthening of conventionally reinforced concrete (RC) bridge members. Once repaired, the member may be exposed to millions of load cycles during its service life. The anticipated life of FRP repairs for shear strengthening of bridge members under repeated service loads is uncertain. Field and laboratory tests of FRP-repaired RC deck girders were performed to evaluate high-cycle fatigue behavior. An in-service 1950s vintage RC deck-girder bridge repaired with externally bonded carbon fiber laminates for shear strengthening was inspected and instrumented, and FRP strain data were collected under ambient traffic conditions. In addition, three full-size girder specimens repaired with bonded carbon fiber laminate for shear strengthening were tested in the laboratory under repeated loads and compared with two unfatigued specimens. Results indicated relatively small in situ FRP strains, laboratory fatigue loading produced localized debonding along the FRP termination locations at the stem-deck interface, and the fatigue loading did not significantly alter the ultimate shear capacity of the specimens.
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Acknowledgments
This research was funded by the Oregon Department of Transportation and the Federal Highway Administration and overseen by research coordinator Mr. Steven Soltesz. All CFRP materials and installation were donated by MBrace of Cleveland and Pioneer Waterproofing of Portland, Oregon, with the help of Mr. Neil Antonini. Reinforcing steel and fabrication were donated by Cascade Steel Rolling Mills of McMinnville, Oregon, and Farwest Steel of Eugene, Oregon, respectively. The writers would also like to thank Dr. Tanarat Potisuk, Mr. Richard Forrest, Mr. Thomas Schumacher, Ms. Michelle Chavez, and Ms. Angela Rogge for their assistance in experimental testing and data reduction. The findings and conclusions are those of the authors and do not necessarily reflect those of the project sponsors or the individuals acknowledged.
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Published In
Journal of Bridge Engineering
Volume 13 • Issue 1 • January 2008
Pages: 24 - 33
Copyright
© 2008 ASCE.
History
Received: Apr 7, 2006
Accepted: May 25, 2006
Published online: Jan 1, 2008
Published in print: Jan 2008
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