Research on the Mechanical Properties of a Reverse-Rotation Locking Sleeve Connection Method

This is the authors' abstract. We don't add key points for this paper.

In recent years， prefabricated construction has demonstrated significant development potential. The grouted sleeve method， as the most commonly used technique for connecting prefabricated components， often encounters issues such as incomplete grout filling at joints， low grout strength， and the cutoff of embedded rebars， all of which compromise structural safety. To address these challenges， a novel connection method for prefabricated components was proposed， and its mechanical properties were validated through flexural and shear tests. The following conclusions were derived from this study： 1） In terms of flexural performance， the ultimate bending load of the sleeve-connected prefabricated beam was reduced by 8.8% compared to that of the monolithic beam， while the ultimate load of the sleeve-connected reinforced prefabricated beam was increased by 23%. Regarding shear performance， the sleeve-connected reinforced prefabricated beam exhibited the highest shear capacity， with differences among the three beams within 5%. 2） The strain values of longitudinal reinforcement at different positions along the beam showed minimal variation. These values exhibited a non-linear pattern at the initial load stage， transitioned to a linear relationship， and reverted to non-linear behavior with further load increase. 3） Under loading， the deflection of the sleeve-connected prefabricated beam increased the fastest， followed by the monolithic beam， while the sleeve-connected reinforced prefabricated beam showed the slowest increase. The analysis demonstrated that the reverse-rotation locking sleeve connection method meets all engineering requirements for both flexural and shear performance as a prefabricated beam joint solution. Furthermore， this method significantly simplifies construction， enhances operational efficiency， and holds substantial practical value.