Abstract:

Fiber reinforced polymer (FRP) bars are currently used as an alternative to steel reinforcement. However, FRP bars are sensitive to high temperatures. For this reason, it is important to establish prediction models related to the change in tensile strength of these materials at high temperatures. In this study, the tensile strength losses of CFRP bars at elevated temperatures were investigated and the mathematical models presented by three researchers in the literature were compared with the experimental results through regression and correlation analyses. In order to present a new alternative model, the experimental data of CFRP (carbon fiber reinforced polymer) bars at high temperatures were analyzed As a result of the study, an alternative mathematical model was created by assuming that the 60°C temperature level does not damage the mechanical and physical properties of CFRP reinforcements, therefore there is no strength loss before this temperature level and there is a parabolic change after this temperature. As a result, it is thought that the proposed new model is compatible with experimental studies and can be an effective prediction tool in structural applications.

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