Shear performance analysis of grouted sleeve connection region in precast assembled columns

Grouted sleeves are widely used in precast assembled structures. Many experiments show that grouted sleeves enhance strength and stiffness in the Grouted Sleeve Connection Region (GSCR) of precast columns. However, measuring the GSCR’s shear strength is challenging in tests due to sleeve length, as it’s an inherent part of these columns. Firstly, the GSCR mechanics model was developed using Modified Compression Field Theory (MCFT). A shear strength calculation method for GSCR was also proposed by analyzing its cross-sectional strains. Subsequently, the logic of the calculation process was validated by calculating the shear strength of cast-in-place short columns and its accuracy was confirmed through finite element analysis. Finally, the effect of grouted sleeves on GSCR’s shear strength under varying axial compression and moment was analyzed using the established computational method. The analysis showed that the shear strength of GSCR was significantly higher than the shear strength normal concrete section. The grouted sleeves bore most of the shear force. The GSCR section’s shear strength increased with rising axial compression ratio but weakened as the bending moment grew. These findings offer valuable insights into the analysis of shear strength in regions with grouted sleeves.