Abstract
This investigation focuses on the moment resistance of a composite beam with high-performance synergized fiber-reinforced concrete (HPFRC) by performing analytical and experimental works. At first, the HPFRC containing 1.0 vol% long hooked steel fibers blended with 0.5 vol% short smooth steel fibers was explored to produce an important synergy in direct tension. The synergy coefficients according to tensile parameters of the HPFRC were ranked as follows: strain capacity < peak tensile stress < peak toughness. Next, six composite beams consisting of normal concrete and HPFRC were tested under three-point bending. The HPFRC placed at an extreme compressive/tensile zone generated a favorable effect on enhancing moment capacity. Finally, an analytical model using section analysis was proposed to estimate the moment resistance of the composite beam with HPFRC.
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