Experimental study on the seismic behaviour of a corroded T-shaped RC shear wall

The available research shows that the corrosion of reinforcement is the main reason for the decrease in durability of reinforced concrete (RC) structures. In this study, wet-dry cycles under constant current conditions were used to perform accelerated corrosion and quasi-static tests of five T-shaped RC shear wall specimens. The effects of corrosion and longitudinal reinforcement ratio of boundary elements on the seismic performance of the T-shaped shear walls were studied. The results showed that the bearing, deformation, and energy dissipation capacities of the specimens gradually decreased with increasing degree of corrosion, and the maximum decreases were 16.73%, 15.95%, and 21.06%, respectively. For the same degree of corrosion, the yield plateau of the T-shaped RC shear wall specimens lengthened with decreasing diameter of the longitudinal reinforcements. The bearing capacity gradually decreased, the longitudinal re-inforcements buckled more quickly, and the specimen failed sooner. In addition, increasing the longitudinal reinforcement ratio of the boundary element increased the bending capacity of the specimen, resulting in greater average shear deformation and ratio at different stages and less bending deformation. The maximum increases in the bearing, deformation, and energy dissipa-tion capacities of the specimens were 17.18%, 10.63%, and 61.22%, respectively. Finally, based on the experimental results, the current theoretical equation was modified, and a model was established for the calculation of the skeleton curve characteristic point parameters of the T-shaped RC shear wall. This model can account for damage caused by corrosion and the ratio of boundary element longitudinal reinforcement.