Cyclic experiments on novel self-centering beam-column connections with replaceable reduced steel plate energy dissipation

This study presents an experimental investigation into the seismic performance of a novel self-centering steel moment connection known as the reduced steel plate-energy dissipation (RSP-ED) connection. The design integrates post-tensioned (PT) strands and replaceable energy-dissipating fuse plates with radial cuts (RSP) or drilled configurations (DSP-1 and DSP-2) to achieve both effective energy dissipation and self-centering behavior. Three full-scale connection specimens were subjected to quasi-static cyclic loading to assess hysteresis behavior, moment-rotation response, strain distribution, failure modes, and repairability. The RSP-ED system demonstrated stable and symmetric hysteresis loops, minimal residual drift, and reliable restoration to the original position after loading, validating its self-centering capability. Strain measurements confirmed that inelastic deformation was confined to the fuse plates, ensuring that the beams and columns remained largely elastic. The RSP specimen showed slightly lower performance but maintained excellent structural integrity and repairability. Failure modes were limited to tearing and buckling of the energy-dissipating plates, which are easily replaceable. The initial stiffness across specimens was consistent, and equivalent viscous damping ratios ranged from 17.8% to 18.9%, significantly exceeding standard design assumptions. PT strand force monitoring revealed predictable prestress losses (∼20–29%), remaining within acceptable limits. This study contributes to advancing the implementation of self-centering technologies in seismic design, emphasizing practicality, sustainability, and structural integrity. Future research should focus on dynamic loading, fatigue performance, and scalability to multi-story applications.