Experimental Research on Concrete Beam-Column Joints Using a Novel Non-Porous Grouting Sleeve Connection

With its advantages of high efficiency， ease of construction， energy savings， and environmental benefits， prefabricated concrete structures have become increasingly prevalent in modern construction. Currently， beam-column connections in such structures are predominantly achieved using grouting sleeves. However， traditional grouting sleeve methods are often associated with issues such as insufficient grout compactness and blockage， which can compromise the seismic performance of the overall structure. In response to these challenges， this study introduces a novel non-porous grouting sleeve connection. The mechanical properties of this novel connection were assessed through pull-out tests， which confirmed that the non-porous grouting sleeve met the required standards for structural joints. Further， a comparative experimental analysis was conducted on both the assembled concrete beam-column joints using the novel grouting sleeve and cast-in-place concrete joints. This analysis examined various performance metrics， including damage modes， hysteresis curves， skeleton curves， ductility， cumulative energy dissipation capacity， and stress development. The results demonstrate that the seismic performance of the prefabricated joints with the novel grouting sleeve is comparable to that of the cast-in-place joints. This indicates that the connection using a novel grouting sleeve not only simplifies construction procedures but also reduces the incidence of joint defects while meeting the required mechanical property criteria.