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Anchorage Strength Models for End-debonding Predictions in RC Beams Strengthened with FRP Composites (bibtex)
by Viviana Nardini, Maurizio Guadagnini, Maria Rosa Valluzzi
Abstract:
The increase in the flexural capacity of RC beams obtained by externally bonding FRP composites to their tension side is often limited by the premature and brittle debonding of the external reinforcement. An in-depth understanding of this complex failure mechanism, however, has not yet been achieved. With specific regard to end-debonding failure modes, extensive experimental observations reported in the literature highlight the important distinction, often neglected in strength models proposed by researchers, between the peel-off and rip-off end-debonding types of failure. The peel-off failure is generally characterized by a failure plane located within the first few millimetres of the concrete cover, whilst the rip-off failure penetrates deeper into the concrete cover and propagates along the tensile steel reinforcement. A new rip-off strength model is described in this paper. The model proposed is based on the Chen and Teng peel-off model and relies upon additional theoretical considerations. The influence of the amount of the internal tensile steel reinforcement and the effective anchorage length of FRP are considered and discussed. The validity of the new model is analyzed further through comparisons with test results, findings of a numerical investigation, and a parametric study. The new rip-off strength model is assessed against a database comprising results from 62 beams tested by various researchers and is shown to yield less conservative results.
Reference:
Anchorage Strength Models for End-debonding Predictions in RC Beams Strengthened with FRP Composites (Viviana Nardini, Maurizio Guadagnini, Maria Rosa Valluzzi), In Mechanics of Composite Materials, volume 44, 2008. (Special issue)
Bibtex Entry:
@ARTICLE{Nardini-etal:2008,
  author = {Viviana Nardini and Maurizio Guadagnini and {Maria Rosa} Valluzzi},
  title = {Anchorage Strength Models for End-debonding Predictions in RC Beams
	Strengthened with FRP Composites},
  journal = {Mechanics of Composite Materials},
  year = {2008},
  volume = {44},
  pages = {257--268},
  number = {3},
  note = {Special issue},
  abstract = {The increase in the flexural capacity of RC beams obtained by externally
	bonding FRP composites to their tension side is often limited by
	the premature and brittle debonding of the external reinforcement.
	An in-depth understanding of this complex failure mechanism, however,
	has not yet been achieved. With specific regard to end-debonding
	failure modes, extensive experimental observations reported in the
	literature highlight the important distinction, often neglected in
	strength models proposed by researchers, between the peel-off and
	rip-off end-debonding types of failure. The peel-off failure is generally
	characterized by a failure plane located within the first few millimetres
	of the concrete cover, whilst the rip-off failure penetrates deeper
	into the concrete cover and propagates along the tensile steel reinforcement.
	A new rip-off strength model is described in this paper. The model
	proposed is based on the Chen and Teng peel-off model and relies
	upon additional theoretical considerations. The influence of the
	amount of the internal tensile steel reinforcement and the effective
	anchorage length of FRP are considered and discussed. The validity
	of the new model is analyzed further through comparisons with test
	results, findings of a numerical investigation, and a parametric
	study. The new rip-off strength model is assessed against a database
	comprising results from 62 beams tested by various researchers and
	is shown to yield less conservative results.},
  doi = {10.1007/s11029-008-9018-9},
  issn = {0191-5665},
  url = {http://dx.doi.org/10.1007/s11029-008-9018-9}
}
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