Pre-Stress Losses in FRP Pre-Stressed Reinforced Concrete – Subject Overview

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Fiber reinforced polymers (FRPs) due to their specific high-strength properties become more and more popular and replace traditional structural materials like conventional steel in prestressed concrete structures. FRP reinforced structures are relatively new when compared to structures prestressed with steel tendons. For that reason only several studies and applications of pre-tensioned FRP reinforcement have been conducted until now. Moreover, researchers only considered short-term behavior of FRP reinforced concrete members. The precise information about long-term behavior of FRP reinforcement is necessary to evaluate the prestress losses, which should be taken into account in the design of prestressed RC structures. One of the most important factor influencing long term behavior of FRP reinforcement is stress relaxation. The overview of experimental tests results described in the available literature considering the prestress losses obtained in FRP prestressed concrete members is presented herein.

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  • 1. ACI440.4R-04 (2004). “Prestressing Concrete Structures with FRP Tendons American Concrete Institute Committee Report.

  • 2. CSA-S807-10 Specification for Fibre-Reinforced Polymers. Canadian Standards Association Mississauga Canada 2010.

  • 3. Fib Model Code for Concrete Structures 2010. The International Federation for Structural Concrete 2013.

  • 4. Fib Federation International de beton fib 2007. Bulletin 40: FRP reinforcement in RC structures. The International Federation for Structural Concrete Lausanne Switzerland 2007.

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  • 6. I. Sasaki I. Nishizaki (2012). “Tensile load relaxation of FRP cable system during long-term exposure tests” Proceedings of 6th International Conference on FRRP Composites in Civil Engineering (CICE2012) June 2012.

  • 7. W.-W. Wang J.-G. Dai K.A. Harries Q.-H. Bao (2012). “Prestress losses and Flexural Behavior of Reinforced Concrete Beams Strengthened with Posttensioned CFRP Sheets” Journal of Composites for Construction 207-216.

  • 8. J. Shi X. Wang H. Huang Z. Wu (2016). “Relaxation behavior of prestressing basalt fiber-reinforced polymer tendons considering anchorage slippage” Journal of Composite Materials 0(0) 1-10.

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