SEISMIC PERFORMANCE EVALUATION OF CONCRETE SHORT-LEG SHEAR WALL WITH HIGH-STRENGTH STEEL BARS

To promote the development of resilient structures and encourage the application of low-bond high-strength steel bars in building structures, a concrete short-leg shear wall with high-strength steel bars for the concealed column longitudinal reinforcement is proposed. Four 1/3-scale short-leg shear wall specimens with a shear-span ratio of 2 were designed and subjected to the quasi-static tests. Analyzed and compared was the influence of parameters such as the type of concealed column longitudinal reinforcement, axial compression ratio, and the plastic hinge area reinforced by carbon fiber on the seismic performance of concrete short-leg shear walls, and explored were the bearing and deformation capacities of the specimens. The focus was primarily on the bearing capacity and deformation capacity of the specimens. The results show that: using high-strength steel bars as the longitudinal reinforcement of concealed columns in concrete short-leg shear walls can achieve an increase in the bearing capacity with an increase in lateral displacement under large deformations, with a small residual deformation and a bending failure mode. Under high axial compression ratios, when the plastic hinge area reinforced by carbon fiber, the bearing capacity was effectively improved. The bending capacity of reinforced concrete short-leg shear walls with high-strength steel bars calculated upon the NewRC model agrees well with experimental results. The ratio of bending deformation to overall deformation in the plastic hinge area of each specimen basically remained constant.