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Fatigue analysis of Steel fibrous Concrete in flexure

The paper presents a study on the fatigue strength of Steel Fiber Reinforced Concrete (SFRC) for various stress levels and stress ratios. Eighty two SFRC beam specimens ofsize 500 mm x 100 mm x 100 mm were tested under four-point flexural fatigue loading. The specimens incorporated 1.0% volume fraction of corrugated xerox type steel fibers ofsize 0.6 mm x 2.0 mm x 30 mm. First, fatigue-life distribution of SFRC for various stress levels is studied and then the concept of equivalent fatiguelife, reported for plain concrete in literature, is applied to SFRC to incorporate the effects of stress level, stress ratio and survival probability (reliability) using the fatigue equation S = f max /f, = A N -B(I-R) . The results indicated that the distribution offatigue-life as well as equivalent fatigue-life of SFRC approximately follows the two-parameter Weibull distribution. The graphical method as well as method ofmoments have been used to obtain the distribution parameters of the Weibull distribution. The coefficients A and B of the above equation have been obtained corresponding to different survival probabilities.