Cyclic response and failure mode of mid-splice replaceable link constructed of LYP160 steel

Abstract

To enhance the seismic performance of traditional eccentrically braced frame structures, this study introduces an innovative mid-splice replaceable link. Compared to conventional welded links, this novel link uses high-strength bolted splices to effectively prevent the premature loss of energy dissipation capacity caused by weld tearing. The replaceable link is available in two variations, distinguished by the types of holes in the web and web splicing plates: standard holes and slotted holes. Cyclic loading tests indicate that the detailed splicing of the replaceable link results in full hysteretic curves and robust energy dissipation capacities. Additionally, this design minimizes deformation of the end plates, allowing for easy disassembly. The high-strength bolts in the web and web splicing plates dissipate energy through slipping, which is the primary mechanism in slotted hole specimens and differs from conventional link methods. Using low-yield-point steel (LYP160), the replaceable link achieves a plastic rotation range from 0.19 to 0.21 rad, which significantly surpasses the 0.08 rad required by AISC 341–16, indicating superior plastic deformation capacity. Furthermore, the overstrength factor of the replaceable link ranges from 3.33 to 5.22, showcasing excellent overstrength performance.