FATIGUE BEHAVIOR OF CFRP-CONCRETE JOINTS UNDER VARYING LOAD FREQUENCY

Reinforced concrete structures are frequently subjected to fatigue loadings. At the interface between FRP and concrete, cyclic loading may induce the formation and coalescence of micro-cracks that result in the interface debonding. The stress transfer mechanism of the FRP-concrete bonded interface is critical to the performance of strengthened elements. This paper reports the preliminary results of an experimental investigation into the static and fatigue behavior of the interfacial bond between carbon fiber-reinforced polymer (CFRP) composite and a concrete substrate. Fatigue and post-fatigue loading curves were obtained to investigate the effect of the load frequency on the specimen response.