Constitutive Relations of Cracked Reinforced Concrete with Steel Fibers

摘要

Eight full-scale panels were tested to study the constitutive relationships of elements (panels) made of reinforced concrete with steel fibers (RCSF). The RCSF panels were subjected to biaxial tensile-compressive loadings. The principal variables of the testing program were: (a) percent of steel fibers by volume, V_(f') (b) length-to-diameter ratio of steel fibers, L_f/D_(f') (c) reinforcing bar ratio in the tensile direction, p, and (d) the tensile strain, ε_(T') in the direction of the principal applied tensile stress.rnBased on the test results, analytical expressions are proposed for the smeared stress-strain curves of cracked steel fiber concrete (SFC) in tension and compression, as well as the smeared tensile stress-strain curves of mild steel embedded in SFC. The proposed analytical expressions take into account the effect of the steel fiber index, W_f (W_f=V_fL_f/D_f).