Fatigue defect of layer steel fiber reinforced concrete

An experimental study is carried out on fatigue defect of layer steel fiber reinforced concrete (LSFRC). Based on experimental data, the various relation curves are given corresponding to different, stress levels 0.9, 0.85, and 0.8. Furthermore, the fatigue defect degree is defined, aim] the strain-cycle ratio. equations and defect-cycle ratio equations with the correlation coefficients very close to I, are regressed in terms of the cubic polynomial, of which the fittings are preferable. In addition, the results show that the fatigue defect of LSFRC presents three-phase development regularity too. And in comparison with the plain concrete, the third phase of the fatigue defect of LSFRC is longer, therefore the fatigue failure of LSFRC is more ductile. The mechanism of the fatigue defect is discussed too.