Seismic performance of a novel bracing system including cable-ring-arc together with MR damper in a steel frame

This study introduces an innovative bracing system that combines cables, a ring-arc mechanism, and magnetorheological (MR) dampers. Several steel frame models, including the new system, were analyzed using SAP2000 software under both static and dynamic loading conditions. The optimal configuration was tested against conventional cross-cable bracing and moment-resisting frame (MRF) systems. Results demonstrated superior seismic performance for the proposed system, particularly in reducing horizontal displacements and enhancing overall frame stability. Parametric analyses indicate that increasing the cable diameter and positioning dampers near the frame corners significantly reduce lateral displacements; however, these modifications also lead to higher internal axial forces. Among these factors, cable diameter had the greatest effect. Although the stiffness of the MR dampers had a limited effect on reducing displacements, proper calibration in relation to the axial forces in the cables is crucial for achieving optimal system performance. Also, prestressing the cables made them less likely to move when there were static loads, but it had the opposite effect when there were dynamic loads. The findings emphasize the new system's effectiveness in improving seismic performance and provide design understanding for optimizing its implementation in steel frame structures. The optimal configuration of the proposed system exhibits markedly enhanced seismic performance compared to both cross-cable bracing and moment-resisting frame systems.