An Analysis of Flexural Bond Length and Anchorage Length of Prestressed Fiber Reinforced Polymer Reinforcement

Abstract

The main aim of this paper is to provide a broader analysis of the flexural bond length andanchorage length of different types of prestressed Fiber Reinforced Polymer (FRP) reinforcement and to providecorrections to the existing theoretical models. Therefore, this paper presents a description of the mainparameters that influence the flexural bond length and anchorage length of different types of FRP reinforcementbased on experimental results found in the literature. The database of more than 70 specimens was compiledwith the results of the transfer length, flexural bond length, and anchorage length of FRP reinforcement and themain influencing parameters. The analysis of a larger database of flexural bond length revealed that propositionsof coefficients αfb = 2.8 and αfb = 1.0 found in the literature for Carbon Fiber Composite Cable (CFCC) strandsand Carbon Fiber Reinforced Polymer (CFRP) bars, respectively, should be corrected. Therefore, correctedvalues of coefficient αfb are proposed in this article for CFCC strands (αfb = 3.0) and CFRP bars (αfb = 0.9).Additionally, the new value of αfb = 1.4 is proposed for flexural bond length of Aramid Fiber ReinforcedPolymer (AFRP) bars. Moreover, the main existing theoretical models are presented, and the comparison oftheoretical and experimental flexural bond length and anchorage length results is discussed. Additionally, theanalysis of the flexural bond length and anchorage length and the proposed new values of the coefficient αfbprovides possibilities for adapting it to design codes for engineering applications and performing additionalresearch that fills the missing gaps in the field.