Abstract
Based on the laboratory experiment of steel fiber reinforced concrete (SFRC), a total of 10 specimens have been designed according to the aggregate interface condition, steel fiber ratios and different-strength concrete. These specimens were computed by MFPA2D in micro-structure level. Comparing the result of SFRC with plain concrete beams, this paper validated the positive effect of steel fiber in crack-resistant and the flexural strength improvement of SFRC beam, analyzed the sensitivity of steel fiber to concrete with different strength, and provided the stress field and elastic modulus images. The numerical results gave the whole failure process of crack initiation, propagation, and interpenetrated. These results provide useful information toward understanding the flexural behavior of SFRC and have great significance to comprehend the flexural failure process of SFRC beam.
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