DURABILITY OF FRP-CONCRETE INTERFACE UNDER FATIGUE LOADING

none4The topic of this research work is the fatigue behavior of externally strengthened concrete beams with fiber-reinforced polymers. An increase of the fatigue life after strengthening is generally reported in literature and is attributed to the reduced stress level in the steel reinforcement due to the presence of FRP. This paper presents an experimental analysis devoted to investigate the fatigue-induced properties of the FRP-concrete interface. Strain patterns along the bonded length and the surrounding concrete were measured using digital image correlation. A decrease of the effective length during cycling is observed, indicating a different debonding mechanism during fatigue. Post-fatigue response of the FRP-concrete interface appears to be qualitatively similar to the monotonic one.mixedC. Carloni; K.V. Subramaniam; M. Savoia; C. MazzottiC. Carloni; K.V. Subramaniam; M. Savoia; C. Mazzott