Numerical modeling and failure analysis of steel fiber-reinforced concrete beams in a reformulated mesoscopic peridynamic model

This paper introduces a mesoscopic peridynamic model aimed at predicting and analyzing the failure of steel fiber-reinforced concrete within the framework of ordinary state-based peridynamics. This model incorporates additional interface force terms to handle substantial differences in component sizes between the fibers and concrete matrix, as well as the intricate behavior at the interface. These terms facilitate the representation of bond and frictional forces based on experimental data and empirical formulas. Additionally, it allows for nonuniform discretization of fiber-matrix interactions to improve computational efficiency. Several typical numerical examples performed by the proposed model closely align with experimental data in terms of bonding and slip behavior at the interface, crack patterns, and p-crack mouth open displacement (P-CMOD) curves, demonstrating the rationality and applicability of the model for numerical analysis on deformation and failure of steel fiber- reinforced concrete.