Single-sided slotted precast concrete joints with friction dissipation devices: Seismic performance and parametric analysis

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To overcome the brittle shear failure and repair difficulties of conventional precast concrete beam–column joints, this study proposes a novel precast beam–column connection featuring a single-sided slotted beam end and a bottom-embedded replaceable sliding friction damper, rooted in the design philosophies of damage control and equivalent monolithic performance. Quasi-static tests show that the joint achieves the ”strong-joint–weak-member” failure mode, and the beam-end damage of the joint is significantly alleviated compared with the monolithic joint. However, its initial stiffness and cumulative energy dissipation decrease by approximately 62% and 30%, respectively. A numerical model was developed in OpenSees and validated against the experimental data, based on which parametric analyses were conducted to investigate the effects of beam depth and damper slip force on seismic performance. The parametric analysis indicated that, With the other geometric and mechanical parameters kept unchanged, beam depth primarily affected the initial stiffness, load-carrying capacity and energy dissipation of the joint, whereas an excessive beam depth reduced the ultimate displacement. The damper slip force significantly influenced the load-carrying capacity, energy-dissipation performance and displacement ductility. Therefore, the beam depth and damper slip force should be coordinated according to the required load-carrying capacity, deformation capacity and energy-dissipation performance of the joint.