Experiment and numerical analysis on seismic performance of resilient shear walls using high strength recycled aggregate concrete

Abstract

In this paper, ultra-high strength bars (UHSB) was innovatively applied to the high-strength recycled aggregate concrete (RAC) shear walls to achieve resilient performance. In order to explore the resilient and seismic performance of the shear wall, five specimens with shear span ratio of 2.2 were tested under cyclic loading. The variables also included the type of longitudinal reinforcement in boundary elements, the presence of anti-corrosion coating in UHSB and the replacement ratio of recycled coarse aggregate (RCA). The results showed that the use of UHSB in the boundary elements significantly improved secondary stiffness and reduced the residual displacement and residual crack width of the shear walls. The anti-corrosion coating decreased bond strength between UHSB and RAC, but it had negligible effect on the seismic and resilient performance of the specimens before 2% drift ratio. Increasing replacement ratio of RCA slightly decreased the lateral force of the specimens under the same drift ratio, but the walls represented satisfactory resilient performance. In addition, finite element models were established in ABAQUS, and the effect of UHSB bond performance, the strength of longitudinal reinforcement with anti-corrosion coating, and the substitution rate of UHSB were analyzed. The results showed that the numerical analysis results were in good agreement with experiment results.