Abstract
This study investigated the shear behaviors of reinforced concrete (RC) short columns retrofitted with a new textile-reinforced mortar (TRM) system made of carbon fiber-reinforced polymer (CFRP) grid-reinforced short-fiber-reinforced concrete (FRC) (referred to as “TR-FRC”). Six RC specimens, including two control specimens and four specimens strengthened with TR-FRC jacket, were tested under the combined action of constant axial load and cyclic horizontal load. The experimental parameters were the reinforcement ratios of CFRP grid and shear span-to-depth ratios. The test results indicated that the shear capacity, deformability, ductility and energy dissipation capacity of the strengthened columns were superior to those of as-built counterparts. The stiffness degradation of the strengthened columns was further delayed as the reinforcement ratio of the CFRP grid in composites overlay increased. Under smaller shear span-to-depth ratio, the TR-FRC system was still very effective in increasing the shear capacity of the RC columns. Moreover, based on the current code and superposition principle, considering the effective strain of the fiber grid, a design equation was proposed to predict the shear capacity of strengthened members.
Published Version
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