Abstract: The nonlinear fracture mechanics (NLFM) method is employed to investigate the interfacial behavior between the embedded steel and concrete for SRC composite structural members. Considering the stress equilibrium, the interfacial governing differential equation is derived based on some basic assumptions. By introducing 5 different bond stress-slip constitutive models, the closed-form solutions for the distribution of bond stress, relative slip and steel stress are obtained. Accordingly, the expression for the anchorange force between steel and concrete is developed. Using bond stress-slip constitutive models, the distributions of the interfacial shear stress are not identical, but the anchorange forces converge to the same expression. From the closed-form solutions, the interfacial nonlinear behavior is determined, and the effective anchorge length for SRC composite structure is proposed on the basis of the analytical results. All these may be helpful for the design and finite element analysis of SRC composite structure.