Abstract Steel fiber reinforced recycled aggregate concrete (SFRRAC) has been widely accepted as a novel composite material due to its superior mechanical properties and environmental benefits. However, the incorporation of steel fibers can reduce the flowability of recycled aggregate concrete (RAC), which hinders its placement in structural elements, particularly in columns with substantial transverse reinforcement. Therefore, experiment and analysis were conducted to investigate the compressive behaviors of SFRRAC columns with a low volumetric tie ratio. The variables considered included the spacing and configuration of transverse ties, as well as the use of steel fibers and recycled aggregate (RA). The test results indicate that steel fibers can improve the strength and ductility of RAC columns. Specifically, for RAC columns with a RA replacement ratio of 50% and a tie spacing of 100 mm, the addition of 1.0% volume fraction steel fibers increased the strength and ductility by 27% and 40%, respectively. However, the beneficial effect of reduced tie spacing diminishes with the presence of steel fibers for RAC columns. The increase in RA replacement ratio results in improved core confinement, while the toughness and ductility of SFRRAC columns are slightly influenced by RA replacement ratio. In addition, an equation for quantifying the ductility of SFRRAC columns was proposed, and ductility design recommendation for SFRRAC columns under severe seismic actions was given based on this equation. Finally, a confinement model for predicting the stress strain response of core concrete in SFRRAC columns was formulated by modification of a previous model, accounting for the effect of RA replacement ratio. The predicted results showed a good agreement with the test ones.
Wang et al. (Wed,) studied this question.
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