Study on the influence of grouted sleeve enhancement effect on the seismic performance of joint core region in precast beam‐column member

Abstract The grouted sleeves can effectively connect the steels, but the connection section of the grouted sleeves will increase the local stiffness, which has an impact on the overall seismic performance of the specimen. How to effectively utilize grouted sleeves to circumvent the drawbacks and improve the seismic performance of precast joints has become a research focus. This paper introduces a novel precast assembled beam‐column joint based on the reinforcement effect of grouted sleeves and studies the influence of grouted sleeves reinforcement on the seismic performance of beam‐column joints through experiments. Three interior beam‐column assemblies representing a portion of a frame subjected to low cyclic loading were tested, including one monolithic cast‐in‐place specimen (RC1) and two precast specimens (PC2, PC1). The seismic performance of each specimen under low cyclic loading was studied. Results indicate that the incorporation of grouted sleeves improves the failure mode of the beam‐column joints. Compared with the monolithic cast‐in‐place specimen, the precast assembled specimens exhibit enhanced load‐carrying capacity, energy dissipation capacity, and deformation capacity. However, due to the obvious stiffness mismatch between the concrete, grouted sleeves, and stirrups, the shear resistance of the sleeves and stirrups could not be fully mobilized. Furthermore, based on the diagonal strut model and integrated the reinforcing effects of stirrups and grouted sleeves, a novel method for calculating the shear capacity of beam‐column joints was presented. This method considers the shear resistance of grouted sleeves. The calculated values obtained using this method show close agreement with the experimental results and are more accurate than those predicted by codes GB 50010‐2010 and ACI 318‐19.