Abstract
Recent theoretical investigations have shown that the rate of fatigue crack growth in fibre reinforced cement-based composites is strongly dependent on the cyclic crack bridging law of the materials. Thus, the basic understanding on crack bridging mechanics is very important and can provide a means of significant improvement of the fatigue performance of fibre reinforced concrete (FRC) structures. In this paper, a cyclic crack bridging model including bond between fibre and matrix degradation for FRC is developed. The model is based on the assumption that the frictional dependent bond strength is gradually reduced due to the interface degradation during fibre pull-out and slip-back. The model predictions are compared with the test results on FRC materials under uniaxial fatigue tension. Good correlation between experiments and theoretical calculations is found.
Published Version
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