Abstract
A cumulative damage theory, which can model the effects of the magnitude and sequence of variable amplitude fatigue loadings, was examined. The concrete beam reinforced with GFRP Rebar specimens was prepared and tested in four-point flexural loading con- ditions. The variable-amplitude fatigue loadings in two and three stages are considered. The present experimental study indicates that the fatigue failure of concrete is greatly influenced by the magnitude and sequence of applied, variable-amplitude fatigue loading. The sum of the cumulative damage is found to be greater then 1.0 when the magnitude of fatigue loading is gradually increased and less than 1 when the magnitude of fatigue loading is gradually decreased. It is seen that the linear damage theory proposed by Palmagren and Miner is not directly applicable to the concrete reinforced with GFRP Rebar under such loading cases. The proposed nonlinear damage theory, which includes the effects of the magnitude and sequence of applied fatigue loadings, allows more realistic fatigue analysis of concrete structures.
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