Reducing residual displacements and maintaining structural serviceability after an earthquake are critical indicators in performance-based seismic design. The core innovation of this research lies in the synergy between the lateral stiffness of the chevron-shaped mega-brace system and the superelasticity of Shape Memory Alloys (SMAs), evaluated for the first time through detailed 3D modeling and explicit dynamic analysis. In this study, the seismic behavior of 2-, 3-, and 6-story configurations is simulated using ABAQUS software to analyze the impact of SMA elements on permanent damage indices. The results demonstrated that the integration of SMA elements significantly reduces damage concentration in primary structural members, with plastic strain reductions of 7%, 50%, and 55% in the 2-, 3-, and 6-story models, respectively. The most significant finding of this research is the nearly complete elimination of residual displacements (a 99/9% reduction) across all models, leading to highly effective self-centering behavior within the mega-brace system. Furthermore, capacity curve analysis revealed that the 6-story model featuring 2-story mega-brace units outperformed the 3-story unit configuration, indicating a substantial enhancement in ductility and energy dissipation capacity compared to conventional systems. This innovation proves that integrating SMAs with mega-brace systems, beyond traditional approaches, can guarantee hysteresis cycle stability through precise control of inelastic strains. Consequently, this hybrid system offers a practical solution for high-importance structures to return to immediate serviceability after seismic events, establishing itself as a next-generation self-centering bracing system for the construction industry.