In this paper, the structural resistance of an existing reinforced concrete frame structure is analyzed. The initial geometry was selected to represent a typical frame structure built during the second half of the 20th century. The calculations take into account assumed input data, including the quality of concrete and reinforcement, as well as the quantity and arrangement of reinforcement. The structural analysis was performed using the Abaqus software package, where the concrete was modeled with solid finite elements, while the reinforcement was represented using beam elements. To accurately simulate the plasticization behavior of the frame elements, nonlinear material models were applied. The behavior of concrete was modeled using the Concrete Damaged Plasticity (CDP) model, which allows for a more precise simulation of the nonlinear behavior of concrete under loading, including crack formation and strength degradation. Based on the obtained results, capacity curves of plastic hinges were defined at critical sections of the structure. Further calculations were carried out using the nonlinear static pushover method with concentrated plasticity, utilizing the ETABS software package. Two analyses were performed according to the HRN EN-1998 standard, and two analysis were conducted following the American ASCE 41 standard for seismic assessment and retrofitting of existing buildings. In the final part of the study, the results were compared, a critical review was provided, and conclusions and guidelines for future research were presented.