New anchorage system of bars to improve the mechanical performance of post-heated FRP-reinforced concrete beams

• Published in: Construction & building materials 2019-12, Vol.229, p.117090, Article 117090
• Main Authors: Hamad, Rami J.A., Haddad, Rami H., Megat Johari, M.A.
• Format: Article
• Language: English
• Subjects: Anchorage; Bond; End cap; Enhancement; Fire; Flexural performance; FRP
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.117090

•The bond between FRP bars and concrete was improved upon the use of end steel caps.•Using end steel caps with FRP bars enhanced the pre-and-post fire flexural behavior of FRP beams.•The positive impact of using end steel caps was more pronounced for heat-damaged rather undamaged beams.•Cracking extent in FRP beams was reduced upon the use of end steel caps.•The overall ductility factor was increased upon the use of end steel caps. The contribution of using end-cap steel anchorage to enhance flexural behavior of concrete beams with FRP reinforcement was investigated. Concrete beam and pull-off specimens were cast using ordinary strength concrete and three different types of FRP bars without and with steel end cap anchorages attached to their ends. Specimens were exposed to elevated temperatures of up to 500 °C before mechanically tested along with undamaged ones. Results showed that use of the proposed technique has tangibly improved the bond strength between FRP bars and heat-damaged concrete and promoted the flexural response of corresponding beams.