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The proposal of the flexural tensile strength formula combines the material test results of steel fiber reinforced concrete conducted by existing researchers at domestic and foreign and the material test results conducted in this study, analyzes the relationship between compressive strength, flexural tensile strength, and the mixing ratio of steel fiber, and An expression for the flexural tensile strength of reinforced concrete was proposed. The proposed formula was theoretically evaluated by applying the mixing ratio of 0.5% obtained through material tests to the formula for drying shrinkage that occurs in concrete.