This study presents an approach to finite element (FE) modelling in Abaqus FEA for analysis of the nonlinear bending behavior of ultra-high-performance fiber-reinforced concrete (UHPC) beams. The Concrete Damaged Plasticity (CDP) model was utilized to capture UHPC’s distinctive mechanical properties, including high tensile strength, nearly linear compressive behavior up to peak stress, and unique failure modes of UHPC beams compared to normal strength reinforced concrete beams. Experimentally validated constitutive laws available in literature for plain and fiber-reinforced UHPC under compression and tension were incorporated, with tensile behavior calibrated through inverse modeling based on average strains in the tensile zone of beams. Other CDP parameters, such as eccentricity, viscosity, and dilation angle, were established based on prior research on standard UHPC specimens and simulations of beams. Three-dimensional FE models of UHPC beams, featuring fiber volume fractions 1–2 % and longitudinal reinforcement ratios 0.31–5.13 %, were developed and validated against experimental data from the authors and other researchers. The model accurately predicts load-deflection curves, moment capacities, cross-sectional strains, cracking pattern, and localization of cracks at all loading stages. This FE modeling approach provides a reliable tool for design of UHPC beams, enhancing the structural performance of critical infrastructure, including bridges, viaducts, and marine structures, under complex loading conditions.