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Modelling of the flexural behaviour of FRP strengthened beams at elevated temperatures

Alessandro Proia (UGent) and Stijn Matthys (UGent)
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Abstract
Over the last decades, fibre reinforced polymer (FRP) materials have been successfully applied to new and existing structures, respectively, as internal and external reinforcement. In case of external reinforcement, FRP can be externally glued on the concrete surface or embedded in the concrete cover by means of an adhesive material (epoxy) in order to increase the bearing capacity of the beams. The mutual interaction between FRP and the concrete section can be described by temperature dependent bond shear stress-slip relationships. Fibres and concrete are usually able to withstand the elevated temperatures without considerable strength reduction, contrary to epoxy adhesive which is significantly influenced by the glass transition temperature (Tg  60°C for ambient cured epoxy adhesive). Above Tg, the mechanical properties of the epoxy tend to decrease, consequently, the bond behaviour between FRP and concrete can be significantly compromised. Because of the epoxy, application of FRP strengthening on concrete beams potentially exposed to elevated temperature needs a suitable thermal protection. Fire tests on insulated FRP strengthened concrete beams have been performed to investigate the response of different thermal insulation systems. In this work, a cross sectional 2D model has been developed to simulate the thermo-mechanical behaviour of the beams. The temperature field of the concrete beam has been modelled to take into account the external thermal insulation. The temperature dependent bond behaviour has been mechanically described by means of specific contact elements able to describes the shear transfer along the beam length. Finally, experimental and numerical results have been compared in order to study the influence of the thermal effects on the fire endurance of the FRP strengthened concrete beams.
Keywords
Concrete, fire, FRP, temperature, modelling

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MLA
Proia, Alessandro, and Stijn Matthys. “Modelling of the Flexural Behaviour of FRP Strengthened Beams at Elevated Temperatures.” Proceedings Int. Conf. Advanced Composites in Construction (ACIC2017). NetComposites Limited, 2017. 149–154. Print.
APA
Proia, A., & Matthys, S. (2017). Modelling of the flexural behaviour of FRP strengthened beams at elevated temperatures. Proceedings Int. Conf. Advanced Composites in Construction (ACIC2017) (pp. 149–154). Presented at the 8th Biennial Conference on Advanced Composites In Construction, NetComposites Limited.
Chicago author-date
Proia, Alessandro, and Stijn Matthys. 2017. “Modelling of the Flexural Behaviour of FRP Strengthened Beams at Elevated Temperatures.” In Proceedings Int. Conf. Advanced Composites in Construction (ACIC2017), 149–154. NetComposites Limited.
Chicago author-date (all authors)
Proia, Alessandro, and Stijn Matthys. 2017. “Modelling of the Flexural Behaviour of FRP Strengthened Beams at Elevated Temperatures.” In Proceedings Int. Conf. Advanced Composites in Construction (ACIC2017), 149–154. NetComposites Limited.
Vancouver
1.
Proia A, Matthys S. Modelling of the flexural behaviour of FRP strengthened beams at elevated temperatures. Proceedings Int. Conf. Advanced Composites in Construction (ACIC2017). NetComposites Limited; 2017. p. 149–54.
IEEE
[1]
A. Proia and S. Matthys, “Modelling of the flexural behaviour of FRP strengthened beams at elevated temperatures,” in Proceedings Int. Conf. Advanced Composites in Construction (ACIC2017), Sheffield, UK, 2017, pp. 149–154.
@inproceedings{8552424,
  abstract     = {Over the last decades, fibre reinforced polymer (FRP) materials have been successfully applied to new and existing structures, respectively, as internal and external reinforcement. In case of external reinforcement, FRP can be externally glued on the concrete surface or embedded in the concrete cover by means of an adhesive material (epoxy) in order to increase the bearing capacity of the beams. The mutual interaction between FRP and the concrete section can be described by temperature dependent bond shear stress-slip relationships. Fibres and concrete are usually able to withstand the elevated temperatures without considerable strength reduction, contrary to epoxy adhesive which is significantly influenced by the glass transition temperature (Tg  60°C for ambient cured epoxy adhesive). Above Tg, the mechanical properties of the epoxy tend to decrease, consequently, the bond behaviour between FRP and concrete can be significantly compromised. Because of the epoxy, application of FRP strengthening on concrete beams potentially exposed to elevated temperature needs a suitable thermal protection. Fire tests on insulated FRP strengthened concrete beams have been performed to investigate the response of different thermal insulation systems. In this work, a cross sectional 2D model has been developed to simulate the thermo-mechanical behaviour of the beams. The temperature field of the concrete beam has been modelled to take into account the external thermal insulation. The temperature dependent bond behaviour has been mechanically described by means of specific contact elements able to describes the shear transfer along the beam length. Finally, experimental and numerical results have been compared in order to study the influence of the thermal effects on the fire endurance of the FRP strengthened concrete beams.},
  author       = {Proia, Alessandro and Matthys, Stijn},
  booktitle    = {Proceedings Int. Conf. Advanced Composites in Construction (ACIC2017)},
  keywords     = {Concrete,fire,FRP,temperature,modelling},
  language     = {eng},
  location     = {Sheffield, UK},
  pages        = {149--154},
  publisher    = {NetComposites Limited},
  title        = {Modelling of the flexural behaviour of FRP strengthened beams at elevated temperatures},
  year         = {2017},
}