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Curved FRP As Concrete Reinforcement (bibtex)
by Thanongsak Imjai, Maurizio Guadagnini, Kypros Pilakoutas
Abstract:
The increased use of fibre-reinforced polymers (FRPs) in reinforced concrete construction is largely driven by the requirement for improved durability, especially for those applications subjected to the most severe environmental conditions. However, the adoption of FRP as embedded reinforcement in new structures has been much slower than in repair and strengthening applications. This is owing to the limited availability of curved FRP reinforcing elements. In addition, the mechanical performance of the bent portions of FRP bars is significantly reduced under a multiaxial combination of stresses, and the tensile strength can be as low as 40% of the uniaxial tensile strength. This paper presents and discusses potential issues relating to the use of curved FRP bars as embedded reinforcement in concrete and uses as an example one of the case studies that was examined during the European funded project, CurvedNFR. A 6 m long concrete plank reinforced with thermosetting FRP bars as longitudinal reinforcement and thermoplastic FRP strips as shear reinforcement was manufactured and tested. The use of FRPs allowed the reduction in the required concrete cover without compromising durability. This study shows that current design recommendations for FRP concrete structures are effective in predicting deflections and crack widths at service load. It is also shown that in FRP concrete, serviceability limit state can control the design.
Reference:
Curved FRP As Concrete Reinforcement (Thanongsak Imjai, Maurizio Guadagnini, Kypros Pilakoutas), In Engineering and Computational Mechanics, volume 162, 2009. (Nominated as one of the best published by ICE technical journals in 2009.) (E-ISSN:1755-0785; Proceedings of the Institution of Civil Engineers)
Bibtex Entry:
@ARTICLE{Imjai-etal:2009,
  author = {Thanongsak Imjai and Maurizio Guadagnini and Kypros Pilakoutas},
  title = {Curved FRP As Concrete Reinforcement},
  journal = {Engineering and Computational Mechanics},
  year = {2009},
  volume = {162},
  pages = {171--178},
  number = {3},
  note = {E-ISSN:1755-0785; Proceedings of the Institution of Civil Engineers},
  abstract = {The increased use of fibre-reinforced polymers (FRPs) in reinforced
	concrete construction is largely driven by the requirement for improved
	durability, especially for those applications subjected to the most
	severe environmental conditions. However, the adoption of FRP as
	embedded reinforcement in new structures has been much slower than
	in repair and strengthening applications. This is owing to the limited
	availability of curved FRP reinforcing elements. In addition, the
	mechanical performance of the bent portions of FRP bars is significantly
	reduced under a multiaxial combination of stresses, and the tensile
	strength can be as low as 40% of the uniaxial tensile strength. This
	paper presents and discusses potential issues relating to the use
	of curved FRP bars as embedded reinforcement in concrete and uses
	as an example one of the case studies that was examined during the
	European funded project, CurvedNFR. A 6 m long concrete plank reinforced
	with thermosetting FRP bars as longitudinal reinforcement and thermoplastic
	FRP strips as shear reinforcement was manufactured and tested. The
	use of FRPs allowed the reduction in the required concrete cover
	without compromising durability. This study shows that current design
	recommendations for FRP concrete structures are effective in predicting
	deflections and crack widths at service load. It is also shown that
	in FRP concrete, serviceability limit state can control the design.},
  comment = {Nominated as one of the best published by ICE technical journals in
	2009.},
  doi = {10.1680/eacm.2009.162.3.171},
  issn = {1755-0777},
  keywords = {design methods & aids; concrete structures; strength and testing of
	materials},
  url = {http://www.icevirtuallibrary.com/getfulltext?linkid=/docserver/fulltext/eacm162-171.pdf&itemWebId=/content/article/10.1680/eacm.2009.162.3.171&mime=pdf}
}
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