Bond Splitting Behavior of Continuous Fiber Reinforced Concrete Members

For the purpose of investigating the bond splitting behavior of continuous fiber reinforced concrete (CFRC) members, two series of investigations were conducted. The first series was performed in order to obtain the local bond behavior in the case of splitting failure of the concrete over members with or without lateral reinforcements. For specimens without lateral reinforcement, test results show that the bond splitting strength is not influenced by the Young's nodulus of reinforcement and that it is approximately proportional to the thickness of the cover concrete. On the other hand, for specimens with lateral reinforcement, the local bond splitting strength is greater than the case where there is no lateral reinforcement. The strength is also dependent of the mechanical property of the lateral reinforcement and is determined solely by the thickness of concrete cover. For both types, a new relationship between the bond stress and the slip reinforcements is proposed. The second series was an analytical study to investigate the average bond behavior of CFRC members, which had several bond lengths and Young's moduli. Analytical results show that in the case of large bond lengths, the analytical bond splitting strength is inversely proportional to the bond length and is clearly influenced by the Young's modulus of the reinforcement. It is considered that continuous bond failure from the loaded end causes a remarkable decrease in the bond strength especially for large bond lengths and low Young's moduli.