Investigation of the fatigue behavior of diagonally-cracked CRC deck-girders repaired with CFRP Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8p58pg271

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  • Fiber reinforced polymers (FRP) are becoming more widely used for repair and strengthening of conventionally reinforced concrete (CRC) bridge members. Once installed, the repair may be exposed to millions of load cycles during 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 CRC deck-girders were performed to evaluate high-cycle fatigue behavior. An in-service 1950's vintage CRC deck-girder bridge repaired with externally bonded carbon fiber laminates for shear strengthening was inspected and instrumented. FRP strain data were collected under ambient traffic conditions. In addition, eight full-size girder specimens repaired with bonded carbon fiber laminate for shear strengthening were tested in the laboratory under repeated loads. Results indicated relatively small in-situ FRP strains, laboratory fatigue loading produced localized debonding along the FRP termination locations at the stem-deck interface, the fatigue loading did not significantly alter the ultimate capacity of the specimens.
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