The influence of two main characteristics of steel fiber, the aspect ratio (D_f) and volume fraction (ρ_f), on the bending strength of Layered Steel Fiber Reinforced Concrete (LSFRC) is investigated by using orthogonal test. Via the variance analysis on the experimental results and trend analysis on the two characteristics, D_f is found significantly related to the bending strength of LSFRC. The influence ratio is 63.3%. The bending strength of LSFRC increases if D_f increases, makes better when D_f reaches 100. ρ_f has ordinary influence on the bending strength of LSFRC. The influence ratio is 29.2%. Other characteristics, such as the shape of steel fiber and the mix proportion, have less influence. The best ρ_f contributing to the bending strength of LSFRC is 1.5%. If ρ_f is greater than 1.5%, it has negative influence on the bending strength of LSFRC. So, ρ_f makes a limited contribution to the bending strength of LSFRC.
展开▼
