This study presents an enhanced version of the concrete damage plasticity (CDP) model, widely used in the nonlinear analysis of concrete structures and implemented in ABAQUS software. Among the various models developed in this domain, the formulation proposed by Koh et al. has gained notable attention due to its use of arbitrary tensile and compressive input curves to characterize damage behavior. Building upon the foundation of the Koh et al. model, the current study introduces two key modifications: (1) replacing the original damage formulation with the Mazars damage model, and (2) incorporating energy-based stress-strain curves to define the constitutive behavior of concrete under tension and compression. The modified model is implemented as a user-defined material subroutine in ABAQUS. The model's performance is evaluated under both monotonic and cyclic loading conditions. Results demonstrate improved accuracy in capturing stiffness degradation and damage evolution, confirming the reliability and effectiveness of the proposed approach for advanced structural simulations.