Concrete beams reinforced with longitudinal glass fiber-reinforced polymer (GFRP) rebars exhibit lower shear capacity than those reinforced with steel rebars. Combining steel fiber-reinforced concrete (SFRC) with GFRP rebars offers a promising solution for enhancing the shear capacity of these beams. Based on an experimental study conducted on eight concrete beams, measuring 150 x 300 x 2050 mm, reinforced with longitudinal GFRP bars and without stirrups, incorporating different steel fiber volumes (0.5%, 0.75%, and 1.0%), simulation models were developed using ABAQUS software. The beams had a shear span-to-depth ratio (a/d) of 3.0, a longitudinal reinforcement ratio of 0.58%, and a characteristic average compressive strength of concrete of 55 MPa at 28 days. An inverse analysis was employed to determine the tensile behavior of all SFRC compositions. The numerical model, validated by the experimental results, adequately reproduced the behavior of the beams. The numerical model of the beam incorporating 0.75% fibers showed the best alignment with the experimental results, yielding an average experimental-to-numerical ratio of 0.90 for the peak load and 0.96 for the deflection. Consequently, this model was chosen for parametric analysis. This model captures experimental behavior and reflects the influence of GFRP and steel properties (stiffness and strength), the a/d ratio on shear response, and the SFRC content, enabling quantification of their effects.