To study the seismic performance of L-shaped precast shear walls with grouted sleeve lapping connection

we carried out quasi-static test on a cast-in-place shear wall and two different precast shear walls in which vertical reinforcements were spliced by type I and type II grouted sleeve lapping connectors named APC connectors (all vertical members precasted in concrete structures). The failure modes

hysteretic properties

characteristic loads

deformations

reinforcement strains

and sleeve strains of the specimens were investigated. Results showed that the crack development of the precast wall was basically the same as that of the cast-in-place wall

and the failure mode was bending shear failure. The failure of the cast-in-place wall occurred at the root of the wall

while the weak section of the precast wall moved upwards due to the restraint of the sleeve. The concrete above the sleeve of the precast wall was crushed and the rebars were buckled at the ultimate failure state. The cracking load

yield load

peak load

stiffness

ductility

and energy dissipation capacity of the precast wall connected by type I connectors were comparable to those of the cast-in-place wall when the bottom stirrups and horizontally distributed reinforcements of cast-in-place wall and precast walls were densified

while the above indicators of the precast wall connected by type II connectors were superior to the cast-in-place wall. The two types of connectors could effectively transmit the stress of reinforcements in the precast wall

and the sleeves were basically in an elastic state during the loading process. Due to the high stiffness of the APC connectors

the absolute value of the maximum out-of-plane displacement of the precast wall was less than that of the cast-in-place wall. However

accumulated damage deformation in out-of-plane torsion appeared in the precast specimens due to the influence of horizontal grouting joint.