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<p>Ultra-high performance fiber reinforced concrete (UHPFRC) provides numerous advantages owing to its enhanced tensile strengths, increased ductility, high energy absorption capacity, and resistance to impact. In this study, UHPFRC mixtures were formulated using the particle packing method with a water-cement (w/c) ratio of 0.25. Alccofine (A) and ground granulated blast furnace slag (GGBS), along with polycarboxylic ether (PCE) based superplasticizer and crimped steel fibers (volume fractions (V<sub>f</sub>): 0%, 0.5%, 1%, 1.5%, 2%, and 2.5%), were employed as constituent materials of UHPFRC. Experimental testing was conducted to investigate the flexural behavior of UHPFRC beams, while finite element method (FEM) numerical modeling was employed for further analysis. Evaluation of ductility parameters such as deflection ductility and energy ductility were carried out based on the load–deflection response of the UHPFRC beams. The inclusion of steel fibers resulted in a significant improvement in ductility indices. Specifically, the maximum deflection ductility ratio achieved in UHPFRC beams at V<sub>f</sub> = 2.5% was 41% higher than that of control RC beams, while the maximum energy ductility ratio achieved at the same volume fraction was 71.34% higher. Additionally, crack propagation in RC beams at first crack and ultimate loads was examined. Numerical modeling of the load–deflection behavior of RC beams yielded results that were in good agreement with the experimental load–deflection response.</p>

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Assessment of Flexural Behavior and Numerical Simulation of UHPFRC Beams with Steel Fibers

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • G. Gautham Kishore Reddy,
  • A. Narender Reddy,
  • B. Sankar,
  • P. Narasimha Reddy

摘要

Ultra-high performance fiber reinforced concrete (UHPFRC) provides numerous advantages owing to its enhanced tensile strengths, increased ductility, high energy absorption capacity, and resistance to impact. In this study, UHPFRC mixtures were formulated using the particle packing method with a water-cement (w/c) ratio of 0.25. Alccofine (A) and ground granulated blast furnace slag (GGBS), along with polycarboxylic ether (PCE) based superplasticizer and crimped steel fibers (volume fractions (Vf): 0%, 0.5%, 1%, 1.5%, 2%, and 2.5%), were employed as constituent materials of UHPFRC. Experimental testing was conducted to investigate the flexural behavior of UHPFRC beams, while finite element method (FEM) numerical modeling was employed for further analysis. Evaluation of ductility parameters such as deflection ductility and energy ductility were carried out based on the load–deflection response of the UHPFRC beams. The inclusion of steel fibers resulted in a significant improvement in ductility indices. Specifically, the maximum deflection ductility ratio achieved in UHPFRC beams at Vf = 2.5% was 41% higher than that of control RC beams, while the maximum energy ductility ratio achieved at the same volume fraction was 71.34% higher. Additionally, crack propagation in RC beams at first crack and ultimate loads was examined. Numerical modeling of the load–deflection behavior of RC beams yielded results that were in good agreement with the experimental load–deflection response.