Cyclic behavior of concrete shear wall with CFRP grid-steel reinforcement

Abstract

Carbon fiber reinforced polymer (CFRP) grid possesses not only the characteristic of FRP material, but the property of grid form with good integrity and bond behavior. It has been applied in structural reinforcement, and recently in new constructions. In this study, thirteen pieces of concrete shear walls, including two reinforced concrete (RC) specimens and eleven CFRP grid specimens with aspect ratios from 1.0 to 2.2, were tested under reversed loading. A new reinforcement configuration with CFRP grid was proposed in specimen design for partial and fully replacing steel bar. Parameters of reinforcement configuration, reinforcement ratio, and aspect ratio were considered in this investigation of cyclic behavior. The mechanical property of CFRP grid shear wall was revealed based on the evaluation of cyclic behavior. A comprehensive perspective of analysis from shear failure to flexural failure was compared and summarized. In general, the experimental results showed that specimens with CFRP grid performed higher load and displacement capacity and lower residual deformation. CFRP grid specimen showed smaller width of main cracks, surrounded by a large number of hairlike cracks, indicating a better stress distribution.