Abstract
This study investigates the flexural performance of hybrid reinforced concrete (HRC) beams with steel and basalt fiber-reinforced polymer (BFRP) bars at two levels considering the concrete cover, bond-slip model of BFRP bars, and hybrid reinforcement ratio of the BFRP to steel areas (Af/As). First, five experimental specimens with different concrete covers representing an experimental reference were tested. Subsequently, the study was extended using a finite element model to investigate the effects of bond characteristics of BFRP bars, ratio Af/As, and concrete compressive strength on the HRC-beam performance. The results demonstrate that adding BFRP bars at the side with the highest tension can significantly improve the structural performance of the beam after steel yielding. Furthermore, the flexural capacity and post-yielding stiffness of the HRC beams are governed by the bond characteristics of the FRP bars used. Finally, recommendations are suggested to tune Af/As to fulfil the requirements of deflections and deformability.
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