“…Based on the above results, this study chose the ultimate shear bond stress, the slip value corresponding to the ultimate shear bond stress, and the interfacial fracture energy as eigenvalues, and proposed a simplified bond–slip constitutive relationship model, as shown in Equations (3)–(7) [ 2 ]. τ u = ατ u 1 τ u 2 τ u 3 τ u 4 τ u 5 τ u 6 S u = βS u 1 S u 2 S u 3 S u 4 S u 5 S u 6 G f = γG f 1 G f 2 G f 3 G f 4 G f 5 G f 6 where τ c is the calculated shear bond stress; τ u is the ultimate shear bond stress; S u is the slip value corresponding to the ultimate shear bond stress; G f is the interfacial fracture energy; S f is the ultimate slip value; α , β , and γ are fitting coefficients; τ u 1 , S u 1 , and G f 1 are influence coefficients of fiber volume fraction on τ u , S u , and G f , respectively; τ u 2 , S u 2 , and G f 2 are influence coefficients of borax content on τ u , S u , and G f , respectively; τ u 3 , S u 3 , and G f 3 are influence coefficients of M / P on τ u , S u , and G f , respectively; τ u 4 , S u 4 , and G f 4 are influence coefficients of W / S on τ u , S u , and G f , respectively; τ u 5 , S u 5 , and G f 5 are influence coefficients of S / B on τ u , S u , and G f , respectively; τ u 6 , S u 6 , and G f 6 are influence coefficients of fly ash content on τ u , S u , and G f , respectively.…”