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Bond behaviour of substandard splices in RC beams externally confined with CFRP (bibtex)
by Reyes Garcia, Yasser Helal, Kypros Pilakoutas, Maurizio Guadagnini
Abstract:
Bond splitting failures of substandard lap-spliced columns have led to collapse of many RC buildings during recent earthquakes in developing countries. The strengthening of lap-spliced regions with CFRP confinement can reduce the seismic vulnerability of such buildings. This paper investigates bond splitting using flexural tests on twelve RC beams with substandard lap splices (25 bar diameters) at midspan. Different confinement configurations (no confinement, internal stirrups or CFRP sheets), concrete covers and bar sizes are examined at the splice region. The results show that light CFRP confinement enhances the splice bond strength by up to 65% compared to unconfined specimens. Predictive equations from the literature are shown to yield a large scatter in results and to overestimate the strain developed in the CFRP confinement. An alternative approach to calculate the confinement strain and the additional bond strength provided by CFRP confinement is proposed and validated.
Reference:
Bond behaviour of substandard splices in RC beams externally confined with CFRP (Reyes Garcia, Yasser Helal, Kypros Pilakoutas, Maurizio Guadagnini), In Construction and Building Materials, volume 50, 2014.
Bibtex Entry:
@ARTICLE{Garcia2014340,
  author = {Reyes Garcia and Yasser Helal and Kypros Pilakoutas and Maurizio
	Guadagnini},
  title = {Bond behaviour of substandard splices in RC beams externally confined
	with CFRP},
  journal = {Construction and Building Materials },
  year = {2014},
  volume = {50},
  pages = {340 - 351},
  number = {0},
  abstract = {Bond splitting failures of substandard lap-spliced columns have led
	to collapse of many RC buildings during recent earthquakes in developing
	countries. The strengthening of lap-spliced regions with CFRP confinement
	can reduce the seismic vulnerability of such buildings. This paper
	investigates bond splitting using flexural tests on twelve RC beams
	with substandard lap splices (25 bar diameters) at midspan. Different
	confinement configurations (no confinement, internal stirrups or
	CFRP sheets), concrete covers and bar sizes are examined at the splice
	region. The results show that light CFRP confinement enhances the
	splice bond strength by up to 65% compared to unconfined specimens.
	Predictive equations from the literature are shown to yield a large
	scatter in results and to overestimate the strain developed in the
	CFRP confinement. An alternative approach to calculate the confinement
	strain and the additional bond strength provided by CFRP confinement
	is proposed and validated.},
  doi = {http://dx.doi.org/10.1016/j.conbuildmat.2013.09.021},
  issn = {0950-0618},
  keywords = {Substandard lap splices; Seismic strengthening; RC beams; CFRP confinement;
	Bond-splitting strength; Bar slip},
  url = {http://www.sciencedirect.com/science/article/pii/S0950061813008611}
}
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