Abstract
The use of carbon fiber-reinforced polymer (CFRP) composites has been identified as a viable technique for use in strengthening deteriorating or structurally deficient reinforced concrete bridges. This article presents the results of a study that consisted of repeated-load fatigue testing 10 reinforced concrete beams strengthened using two different types of externally-bonded CFRP composites. The results indicate that the bond between the composite laminates and surface of the concrete can degrade at load amplitudes corresponding to extreme load conditions for a bridge. The stress range applied to the reinforcing steel and maximum stress applied to the composite laminates were the controlling parameters that limited the fatigue life of the specimens under study. The authors conclude that an upper limit on stresses generated along the composite-concrete interface may have to be set during design to avoid premature debonding after a limited number of load cycles.
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