EXPERIMENTAL STUDY ON FLEXURAL BEHAVIOR OF MONOLITHIC PRECAST CONCRETE SHEAR WALLS WITH MORTISE-TENON JOINTS

Four monolithic precast concrete shear walls with mortise-tenon joints were designed, and the effect of axial load ratio on mechanical behavior has been investigated under cyclic loading. The results show that the flexural failure mode is exhibited in damaged walls in these tests. Due to the precast concrete spalling at the root of transverse protrusion of mortise-tenon joint, the crushing areas of concrete at the root of shear walls become smaller to avoid the abrupt bearing capacity loss. The mortise-tenon joints can ensure the reliable connection between different precast concrete slabs, and the cracking displacement angles of shear wall specimens are 1/780~1/560. With the increase of axial load ratio, the precast concrete spalling at the root of transverse protrusion of mortise-tenon joint is aggravated, but the crushing areas of concrete at the root of shear walls have no increase. Even though the experimental axial load ratio is 0.3 (design axial load ratio is 0.54), the concrete at the root of shear walls is not crushed in failure state and the specimen still has good deformation capacity under high axial load ratio. As a conclusion, with the increase of axial load ratio, the flexural capacity and stiffness will increase, but the stiffness degradation rate will accelerate after peak load, and the displacement ductility will decrease.