EXPERIMENTAL STUDY ON FLEXURAL FATIGUE PERFORMANCE OF STEEL FIBER REINFORCED CONCRETE

The flexural fatigue experiment of plain concrete (C) and Steel Fiber Reinforced Concrete (SFRC) were carried out to study the flexural fatigue performance and damage law under the cyclic loading. The size of specimen was 100mm X 100mm X 400mm and the design strength of concrete was C50. The strain gauges were pasted on the bottom of the specimen, and the strain was collected by dynamic acquisition instrument. The strain- fatigue life curves under cyclic loading at different stress levels were analyzed by comparing the results of fatigue experiment to research the fatigue resistance of SFRC. Regression analysis was applied to examine Weibull Distribution of fatigue life. The fatigue equation of the double logarithmic form was established for the practical engineering. The paper provides theoretical basis for research of flexural fatigue behavior of SFRC.