Short-Term Flexural Stiffness Prediction of CFRP Bars Reinforced Coral Concrete Beams

• Main Authors: Lei Wang, Jin Yi, Jiwang Zhang, Wu Chen, Feng Fu
• Format: Article
• Language: English
• Published: MDPI AG 2021-01-01
• Series: Materials
• Subjects: coral concrete beams; CFRP bars; strain inhomogeneity coefficient; flexural stiffness; relative slip
• Online Access: https://www.mdpi.com/1996-1944/14/2/467

<b>Abstract: </b>FRP (Fiber Reinforced Polymer) Bar reinforced coral concrete beam is a new type of structural member that has been used more and more widely in marine engineering in recent years. In order to study and predict the flexural performance of CFRP reinforced coral concrete beams, the flexural rigidity, crack morphology and failure mode of concrete were studied in detail. The results show that under the condition of similar reinforcement ratio, the flexural rigidity of CFRP reinforced coral concrete beam is significantly lower than that of ordinary reinforced concrete beam. Increasing the cross-section reinforcement ratio within a certain range can increase the bending stiffness of the test beam or reduce the deflection, but the strength utilization rate of CFRP reinforcement is greatly reduced. The short-term bending stiffness of the CFRP reinforced coral concrete beam calculated by the existing standard formula is obviously higher. This paper proposes a modified formula for introducing the strain inhomogeneity coefficient (<em>Ψ</em><span style="position: relative; top: 5.0pt;"></span>) of CFRP bars and considers the relative slip between CFRP bars and coral concrete to predict the short-term flexural stiffness of coral concrete beams reinforced by CFRP bars. The formula was verified with the test results, and it was proved that the formula has a good consistency with the test results.