Full-range analysis and life prediction of steel fiber reinforced concrete beam subjected to fatigue loading
This paper explore the fatigue damage evolution process and predict the fatigue life of steel fiber reinforced concrete(SFRC)beam.Based on the fatigue damage evolution characteristics of SFRC in compression zone and the tensile zone and tensile reinforcement of beam,combined with the fatigue test results of SFRC beam,the full-range analysis and life prediction model of SFRC beam subjected to fatigue loading was established by the method of segment linearization.Subsequently,the results were compared to the test results for validation.Based on the proposed model,the degradation law of concrete and tensile reinforcement strains,and cross-sectional area of tensile reinforcement of SFRC beams with the fatigue cycles were analyzed,and the residual ultimate capacity of SFRC beam after different fatigue cycles was obtained.The results show that steel fibers can significantly improve the fatigue performance of beams.The cross-sectional area of tensile steel bars in the beam shows a two-stage decreasing trend with increasing fatigue cycles,while the strains of concrete in the compression zone and tensile steel bars,as well as the remaining capacity of the beam,exhibit a three-stage development pattern.The average ratio of experimental fatigue life to predicted fatigue life of 42 SFRC beams is 0.953,with a coefficient of variation of 0.284,indicating good overall agreement.
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