ABSTRACT A finite element (FE) model is carried out to study the bending behavior of concrete beams constructed of high and ultra-high strength concrete (HSC/UHSC) under three-point bending. The simulated beams are reinforced with longitudinal reinforcement bars from fiber reinforced polymer (FRP) material. The ABAQUS FE software is used in the modeling. The FE model was calibrated using the experimental data of the specimens carried out by M.W. Goldston et al. (2017). Twenty-eight validated FE models were performed to study the effects of concrete compressive strength (high and ultra-high), type of FRP longitudinal bars (AFRP, BFRP, CFRP and GFRP), main FRP reinforcement ratio (0.74%, 1.16% and 1.67%), compression FRP reinforcement ratio (As’ %; 25%, 40%, 100%), and both of beam width and depth (b and d). From the results; it is found that the concrete strength has a small effect on the ultimate capacity. However, the deflection is higher for beams with lesser strength. For all the cases, CFRP reinforced beams showed higher capacity and lesser ductility, while GFRP reinforced beams showed lesser capacity and higher ductility. As’ ratio has insignificant effect on load capacity, but it can improve deflection; it is recommended that As’ did not exceed 40% from AFRP. The beam width has insignificant effect on carrying capacity, but it decreases the corresponding deflection, while increasing the beam depth led to increase the maximum load and decrease the corresponding deflection. Comparable error is generally obtained when using the both equations of Issa and Issa (2017) and ACI440.1 (2015).