Experimental study on seismic performance of two-segment replaceable link with channel splicing plate

The study introduces an innovative design for enhancing the energy -dissipating capacity and replaceability of eccentrically braced steel frames using a two -segment replaceable shear link. This design features a 10 mm gap in the mid -length, providing an installation tolerance for easy disassembly. The two segments are connected through channel splicing plates and side plates, emphasizing concentrated plastic deformation in the energydissipating region. Fully bolted connections involve non -energy -dissipating components, allowing efficient elastic design and focused plastic behavior. To evaluate seismic performance, two types of replaceable links were designed for cyclic loading tests: one with standard holes and the other with slotted holes in the side plate and channel splicing plate. Test results highlight localized plastic deformation in the energy -dissipating region, with failures such as broken welds, severe flange buckling, and web plate tearing. Stable hysteresis curves exhibit good ductility, energy dissipation, and plastic deformation. The ultimate plastic angle exceeds 0.13 rad, surpassing the AISC 341-16 limit of 0.08 rad. Ductility coefficients range from 6.10 to 7.99, and overstrength coefficients range from 1.82 to 2.09, exceeding the AISC 341-16 limit of 1.5. Furthermore, a two -stage design method for bolted connections, accounting for bolt slip, is proposed. This method enhances the overall understanding and utilization of these innovative replaceable shear links, providing a comprehensive solution for improving the seismic performance of eccentrically braced steel frames.