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Double Shear Tests for Characterisation of Bond Between FRP EBR and Concrete (bibtex)
by Andreea Serbescu, Maurizio Guadagnini, Kypros Pilakoutas
Abstract:
The strengthening potential of FRP Externally Bonded Reinforcement (EBR) is already well established. However, the optimum design of FRP systems cannot yet be achieved due to premature debonding. Despite the large amount of research efforts, existing bond capacity models still lead to either uneconomic or unsafe predictions with large scatter. Valuable input for many models is provided by the interfacial bond-slip relationship determined from various simplified bond tests, especially the double shear test. A Round Robin Test exercise was carried out at 7 international laboratories in order to assess the feasibility of the double shear test as a potential standardised procedure. The present paper describes the methodology followed and reports the findings of the tests performed at The University of Sheffield on 6 different types of EBR systems. The discussion of the results includes the influence of various parameters on the bond-slip development as well as the effect of roughness of the substrate surface on bond capacity. The paper also offers a critical view on the drawbacks and limitations that this type of test can have in reproducing the actual stress state existing in RC beams. Suggestions for further improvements of the testing procedure are also proposed.
Reference:
Double Shear Tests for Characterisation of Bond Between FRP EBR and Concrete (Andreea Serbescu, Maurizio Guadagnini, Kypros Pilakoutas), In Proceedings of the Third Asia-Pacific Conference on FRP in Structures (APFIS 2012), 2012.
Bibtex Entry:
@INPROCEEDINGS{Serbescu-etal:2012,
  author = {Andreea Serbescu and Maurizio Guadagnini and Kypros Pilakoutas},
  title = {Double Shear Tests for Characterisation of Bond Between FRP EBR and
	Concrete},
  booktitle = {Proceedings of the Third Asia-Pacific Conference on FRP in Structures
	(APFIS 2012)},
  year = {2012},
  address = {Hokkaido University, Sapporo, Japan},
  month = {2-4 February 2012},
  abstract = {The strengthening potential of FRP Externally Bonded Reinforcement
	(EBR) is already well established. However, the optimum design of
	FRP systems cannot yet be achieved due to premature debonding. Despite
	the large amount of research efforts, existing bond capacity models
	still lead to either uneconomic or unsafe predictions with large
	scatter. Valuable input for many models is provided by the interfacial
	bond-slip relationship determined from various simplified bond tests,
	especially the double shear test. A Round Robin Test exercise was
	carried out at 7 international laboratories in order to assess the
	feasibility of the double shear test as a potential standardised
	procedure. The present paper describes the methodology followed and
	reports the findings of the tests performed at The University of
	Sheffield on 6 different types of EBR systems. The discussion of
	the results includes the influence of various parameters on the bond-slip
	development as well as the effect of roughness of the substrate surface
	on bond capacity. The paper also offers a critical view on the drawbacks
	and limitations that this type of test can have in reproducing the
	actual stress state existing in RC beams. Suggestions for further
	improvements of the testing procedure are also proposed.},
  keywords = {bond stress, EBR, double shear test, concrete surface roughness, interfacial
	bond law},
  owner = {Maurizio},
  timestamp = {2012.02.22}
}
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