Shape Memory Alloys (SMAs) as novel materials have attracted significant attention from engineers due to their unique behavior. One of the most important characteristics of these materials is their superelastic behavior, which allows them to return to their original shape after considerable deformation. In this type of behavior, shape memory alloys can also dissipate significant amounts of energy while returning to their initial state. In this research, superelastic Nitinol alloy is used to enhance the performance of knee dampers. To this end, a frame with knee dampers was selected as the reference model and was modeled and validated using the numerical software Abaqus. After confirming the correct behavior of the numerical model, the SMA damper was installed perpendicularly to the knee damper and in the space between the knee damper and the connection of the beam to the column. This paper examines two parameters: the cross-section and the length of the SMA damper. The results indicate that increasing the length of the SMA increases the system's resistance, and the impact of the SMA length on the system resistance becomes more pronounced with an increase in the cross-section of the SMA damper. Additionally, the increase in the cross-section of the SMA damper significantly enhances the system's recovery. Furthermore, due to the considerable recovery that the SMA damper provides in the structure, the amount of energy dissipation in the system is reduced compared to the reference model. The amount of energy dissipation is dependent on the length and cross-section of the SMA damper, such that a longer SMA leads to greater energy dissipation and a smaller cross-section results in less energy dissipation in the system.