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Advances in Concrete Construction
  Volume 14, Number 1, July 2022 , pages 45-55

Experimental investigation on UHPC beams reinforced with GFRP and steel rebars and comparison with prediction equations
Yousef Abbasi Parvin, Taleb Moradi Shaghaghi, Masoud Pourbaba, Seyyed Saeed Mirrezaei and Yousef Zandi

    In this article, the flexural and shear capacity of ultra-high-performance fiber-reinforced concrete beams (UHPFRC) using two kinds of rebars, including GFRP and steel rebars, are experimentally investigated. For this purpose, six UHPFRC beams (250 × 300 × 1650 mm) with three reinforcement ratios (ρ) of 0.64, 1.05, and 1.45 were constructed using 2% steel fibers by volume. Half of the specimens were made of UHPFRC reinforced with GFRP rebars, while the other half were reinforced with conventional steel rebars. All specimens were tested to failure in four-point bending. Both the load-deformation at mid-span and the failure pattern were studied. The results showed that utilizing GFRP bars increases the flexural strength of UHPFRC beams in comparison to those made of steel bars, but at the same time, it reduces the post-cracking strain hardening. Furthermore, by increasing the percentage of longitudinal bars, both the post-cracking strain hardening and load-bearing capacity increase. Comparing the experiment results with some of the available equations and provisions cited in the valid design codes reveals that some of the equations to predict the flexural strength of UHPFRC beams reinforced with conventional steel and GFRP bars are reasonably conservative, while Khalil and Tayfur model is un-conservative. This issue makes it essential to modify the presented equations in this research for predicting the flexural strength of UHPFRC beams using GFRP bars.
Key Words
    flexural behavior; GFRP bar; steel rebar; Ultra-high-performance fiber-reinforced concrete (UHPFRC)
(1) Yousef Abbasi Parvin, Taleb Moradi Shaghaghi, Seyyed Saeed Mirrezaei, Yousef Zandi:
Department of Civil Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran;
(2) Masoud Pourbaba:
Department of Civil Engineering, Maragheh Branch, Islamic Azad University, Maragheh, Iran.

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