Given the prevalence of earthquakes globally, including those in Iran, it has become essential to recognize certain outdated and ineffective practices in the country, elevate the expertise of professionals, and develop updated versions of structural and earthquake codes. Additionally, due to the significant amount of construction in the nation and the frequency of earthquakes, structures equipped with steel flexural frame systems need seismic upgrades to comply with the latest versions of the Iranian Code 2800. In light of these observations, the current research aims to enhance medium-sized steel flexural frames by applying the technical standards set forth in the Iranian Code 2800 (Third edition) and using SAP2000 software. To achieve this, software models were created for buildings with 5 and 10 floors, respectively, with designs following the Iranian Code 2800 (Third edition) and the tenth topic of the National Building Regulations (Design and implementation of steel buildings). These structures were then subjected to seismic forces, and their desired improvements were realized through two methodologies: nonlinear static analysis and nonlinear time history dynamic analysis. Structures designed in accordance with the Iranian Code 2800 (Third edition) have shown a reduction in issues such as story drift, roof story displacement, and target displacement; the enhanced structures exhibit improved performance levels. Moreover, the type and positioning of plastic connections are now more effective and demonstrate superior behavior compared to their conditions prior to the enhancement.