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Strengthening with near surface mounted reinforcement: structural and fire behavior

Aniello Palmieri (UGent) , Stijn Matthys (UGent) and Luc Taerwe (UGent)
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Abstract
Since half a decade, an increasing number of applications are based on near surface mounted fiber reinforced polymer reinforcement (FRP NSM). This technique is based on the concept of embedding FRP bars into grooves made in the concrete cover of the elements to be strengthened. Compared to externally bonded FRP reinforcement (FRP EBR), the NSM system generally presents better bond characteristics, a more ductile behaviour, better resistance to mechanical damage, fire and accidental impact. Though the fibres used for FRPs generally exhibit a good fire resistance, this is not the case for the polymer binder of these composites. Hence, concrete structures strengthened with FRPs perform weak under fire conditions. In the case of NSM the FRP reinforcement is not longer externally bonded, but in slits. This offers extra opportunities for fire protection. The paper presents a literature review with respect to the influence of high temperature on the mechanical properties of FRP and filling mortar. Furthermore the flexural behaviour of FRP NSM strengthened beams (at room temperature) is investigated. The structural performance and modes of failure of the tested beams are presented and discussed. Furthermore preliminary fire test results on concrete blocks protected by different fire board insulation systems are presented. The fire resistance of the different insulation system and the proper thickness of insulation are investigated and discussed. Finally the scheduled large scale tests are discussed.
Keywords
NSM, fire tests, strengthening, FRP, Fire, concrete

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MLA
Palmieri, Aniello, et al. “Strengthening with near Surface Mounted Reinforcement: Structural and Fire Behavior.” Proceedings of the Third International Congress and Exhibition Fib “Think Globally, Build Locally,” Ghent University, Department of Structural engineering, 2010, pp. 1–10.
APA
Palmieri, A., Matthys, S., & Taerwe, L. (2010). Strengthening with near surface mounted reinforcement: structural and fire behavior. Proceedings of the Third International Congress and Exhibition Fib “Think Globally, Build Locally,” 1–10. Ghent, Belgium: Ghent University, Department of Structural engineering.
Chicago author-date
Palmieri, Aniello, Stijn Matthys, and Luc Taerwe. 2010. “Strengthening with near Surface Mounted Reinforcement: Structural and Fire Behavior.” In Proceedings of the Third International Congress and Exhibition Fib “Think Globally, Build Locally,” 1–10. Ghent, Belgium: Ghent University, Department of Structural engineering.
Chicago author-date (all authors)
Palmieri, Aniello, Stijn Matthys, and Luc Taerwe. 2010. “Strengthening with near Surface Mounted Reinforcement: Structural and Fire Behavior.” In Proceedings of the Third International Congress and Exhibition Fib “Think Globally, Build Locally,” 1–10. Ghent, Belgium: Ghent University, Department of Structural engineering.
Vancouver
1.
Palmieri A, Matthys S, Taerwe L. Strengthening with near surface mounted reinforcement: structural and fire behavior. In: Proceedings of the Third International Congress and Exhibition Fib “Think Globally, Build locally.” Ghent, Belgium: Ghent University, Department of Structural engineering; 2010. p. 1–10.
IEEE
[1]
A. Palmieri, S. Matthys, and L. Taerwe, “Strengthening with near surface mounted reinforcement: structural and fire behavior,” in Proceedings of the Third International Congress and Exhibition Fib “Think Globally, Build locally,” Washington, WA, USA, 2010, pp. 1–10.
@inproceedings{1843188,
  abstract     = {{Since half a decade, an increasing number of applications are based on near surface mounted fiber reinforced polymer reinforcement (FRP NSM). This technique is based on the concept of embedding FRP bars into grooves made in the concrete cover of the elements to be strengthened. Compared to externally bonded FRP reinforcement (FRP EBR), the NSM system generally presents better bond characteristics, a more ductile behaviour, better resistance to mechanical damage, fire and accidental impact. Though the fibres used for FRPs generally exhibit a good fire resistance, this is not the case for the polymer binder of these composites. Hence, concrete structures strengthened with FRPs perform weak under fire conditions. In the case of NSM the FRP reinforcement is not longer externally bonded, but in slits. This offers extra opportunities for fire protection. The paper presents a literature review with respect to the influence of high temperature on the mechanical properties of FRP and filling mortar. Furthermore the flexural behaviour of FRP NSM strengthened beams (at room temperature) is investigated. The structural performance and modes of failure of the tested beams are presented and discussed. Furthermore preliminary fire test results on concrete blocks protected by different fire board insulation systems are presented. The fire resistance of the different insulation system and the proper thickness of insulation are investigated and discussed. Finally the scheduled large scale tests are discussed.}},
  author       = {{Palmieri, Aniello and Matthys, Stijn and Taerwe, Luc}},
  booktitle    = {{Proceedings of the Third International Congress and Exhibition Fib 'Think Globally, Build locally'}},
  keywords     = {{NSM,fire tests,strengthening,FRP,Fire,concrete}},
  language     = {{eng}},
  location     = {{Washington, WA, USA}},
  pages        = {{1--10}},
  publisher    = {{Ghent University, Department of Structural engineering}},
  title        = {{Strengthening with near surface mounted reinforcement: structural and fire behavior}},
  year         = {{2010}},
}