This research investigates the seismic performance of a novel cable bracing system incorporating a central steel plate for retrofitting reinforced concrete (RC) and steel frames. Cable bracing systems, with their high strength-to-weight ratio and flexibility, offer a promising solution but face challenges like low ductility and buckling potential. To enhance the performance of these systems, a central steel plate is introduced to mitigate these issues. The methodology includes reproducing and validating three reference models: steel frames with and without X-bracing, and an RC frame with cable bracing and a central steel plate. These models are subjected to cyclic loading in SAP2000, using non-linear elastoplastic behavior for beams and columns, and nonlinear catenary behavior for the cables. A 2D RC frame is then retrofitted with the cable bracing system and tested under nonlinear time-history analysis to assess its hysteretic behavior and seismic performance. Key findings demonstrate that the addition of cable bracing significantly improves yielding strength, stiffness, and energy dissipation, enhancing overall structural performance under lateral loads. The introduction of the central steel plate further enhances ductility and strength. Sensitivity analyses reveal that plate size, thickness, and cable diameter significantly influence seismic response, with larger and thicker plates, as well as increased cable pre-tensioning, improving performance. This research provides a foundation for future studies, emphasizing the need for experimental validation and exploring the system's performance under diverse seismic conditions and configurations.