دراسة عددية لتحديد تأثير خصائص التصدع على سلوك الجوائز البيتونية المسلحة الحاوية على ألياف فولاذية عند تغير عدة بارامترات

Abstract

    Fracture properties are considered as one of the main factors that control the nonlinear behavior of concrete elements, as they directly affect the bearing capacity, ductility, and response of the structural element under different loads. Accurate representation of these properties in numerical models is essential for obtaining realistic results that reflect the actual behavior of the studied element. This study aims to determine the effect of fracture properties on the structural behavior of steel fiber-reinforced concrete (SFRC) beams through numerical simulation using the finite element program Abaqus. The numerical model was validated by calibrating it with the results of several published experimental research and studies, providing a reliable basis for analysis. The effect of fracture properties was studied with changes in volumetric ratio of steel fibers, the characteristic compressive strength of concrete, and the longitudinal reinforcement ratio. The results showed that introducing the effect of fracture properties with changes in the volumetric ratio of fibers did not show a direct linear response in the behavior of the studied beams, as the improvement in performance was not directly proportional to its increase, making its effect less clear compared to the rest of the factors. In contrast, the characteristic concrete strength had the most prominent effect, as the bearing capacity of the beams increased by up to 8.6%, while the deflection at failure increased by 18.9% when fracture properties were introduced. As for the fracture properties with an increase in the longitudinal reinforcement ratio, it contributed to improving the performance by 7.7% in terms of bearing capacity and 11.9% in terms of deflection at failure. These results highlight the vital role of accurately representing fracture properties in numerical modeling to achieve realistic structural behavior.