An innovative dual-level energy dissipation system with friction/yielding dampers: numerical and theoretical approaches

In this paper, an innovative configuration for steel braced frames, incorporating an energy absorption system proposed. The proposed bracing system features a dual-level slotted bolted connection (SBC) dampers with slipping performance and a horizontal shear panel system (H-SPS) integrated into eccentrically braced frames (EBF), referred to as CS-EBF. Consequently, the fuses within this system, allowing controlled slip in the first fuse and inelastic deformation in the second fuse. Hence, the proposed system concentrate damage within the fuses, preventing harm to other components. Numerical results demonstrate that the CS-EBF system exhibits greater ductility and energy dissipation compared to similar single-level systems. Additionally, the slip of the SBC fuse at low earthquake levels initiates the energy absorption process earlier than in other comparable dual-level systems, ultimately leading to smaller dimensions for the bracing frame sections.