Study of Effects of Grouting Defects on the Seismic Performance of Precast Concrete Shear Walls with Different Structural Characteristics

Precast concrete structure is the trend of intelligent construction of green buildings in the future. Grouting sleeve connection has the advantages of convenient construction and connection performance equivalent to cast-in-place, and is widely used in steel bar connection of precast concrete structures. Controlling the compactness of sleeve grouting is the key to ensure the construction quality and structural reliability of precast structures. In order to analyze the influence of grouting defects on the seismic performance of assembled shear walls, the finite element simulation was carried out based on OpenSees with the location of grouting defects, the length of defects and the number of grouting defect sleeves as variables. Considering the diversity of the grouting sleeve shear walls, the sensitivity of the characteristic parameters such as sleeve spacing and edge constraint area to grouting defects was studied. The results show that the precast concrete shear walls with grouting defects will have different degrees of loss in bearing capacity, energy dissipation capacity and ductility. The bearing capacity and energy dissipation capacity of the shear wall connected by grouting sleeve are greatly affected by grouting defects. The sensitivity of equivalent stiffness and ductility coefficient to grouting defects is lower than that of bearing capacity and energy dissipation capacity. The grouting defects in the embedded column of the shear wall connected by grouting sleeve have a significant effect on the seismic performance.