Self-Centering Precast RC Beam–Column Joints Incorporating SRC and UEDD: Theoretical and Parametric Investigations

This paper presents a novel precast self-centering energy-dissipating (PSC-ED) joint, which utilizes self-centering rebar couplers (SRCs) to provide restoring force and unidirectional energy-dissipating dampers (UEDDs) to enhance energy dissipation capacity. First, the structures and mechanical models of SRCs and UEDDs are elaborated, the design methods for key parameters are clarified, and on this basis, the configurations of the PSC-ED joint are illustrated. Subsequently, theoretical and finite-element models of the PSC-ED joint are established and validated against experimental results. Parametric studies are conducted to assess the effects of SRC preload, SRC maximum stroke, UEDD friction force, and concrete strength on seismic performance. The results show that increased SRC preload significantly improves self-centering performance and load-bearing capacity; a larger SRC maximum stroke enhances elastic deformation and delays the occurrence of peak load; properly designed UEDD friction can improve energy dissipation while restricting residual deformation; and higher-strength concrete is recommended in engineering applications to prevent crushing during joint rocking.