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Strengthening of RC Beams with an Innovative Timber-FRP Composite System (bibtex)
by Nicola Mazzon, Maurizio Guadagnini, Maria Rosa Valluzzi
Abstract:
The results of a theoretical and experimental research project on the use of an innovative technique for strengthening concrete beams are presented. A spacer element is inserted between the tension side of a beam and the composite material to increase its lever arm and to enhance the over all stiffness of the strengthened beam. The main aim of this exploratory project was to increase the ultimate failure load of strengthened beam specimens, whilst guaranteeing acceptable over all deflections at the serviceability limit states. This resulted into a significant reduction in the amount of FPR required and in a better utilization of the materials employed. A preliminary theoretical study was carried out to investigate the effect of Young’s modulus, failure strain, and thickness of the element to be used as a spacer in order to determine the best possible candidate material. Three tests on 2.5-m-long beams were carried out, and different anchorage techniques were used to try and prevent the debonding of the strengthening system. The results from this pilot study are very promising, as the strengthening system ensures an adequate initial stiffness along with an improved ultimate flexural capacity.
Reference:
Strengthening of RC Beams with an Innovative Timber-FRP Composite System (Nicola Mazzon, Maurizio Guadagnini, Maria Rosa Valluzzi), In Mechanics of Composite Materials, volume 44, 2008. (Special issue)
Bibtex Entry:
@ARTICLE{Mazzon-etal:2008,
  author = {Nicola Mazzon and Maurizio Guadagnini and {Maria Rosa} Valluzzi},
  title = {Strengthening of RC Beams with an Innovative Timber-FRP Composite
	System},
  journal = {Mechanics of Composite Materials},
  year = {2008},
  volume = {44},
  pages = {279--288},
  number = {3},
  month = {May},
  note = {Special issue},
  abstract = {The results of a theoretical and experimental research project on
	the use of an innovative technique for strengthening concrete beams
	are presented. A spacer element is inserted between the tension side
	of a beam and the composite material to increase its lever arm and
	to enhance the over all stiffness of the strengthened beam. The main
	aim of this exploratory project was to increase the ultimate failure
	load of strengthened beam specimens, whilst guaranteeing acceptable
	over all deflections at the serviceability limit states. This resulted
	into a significant reduction in the amount of FPR required and in
	a better utilization of the materials employed. A preliminary theoretical
	study was carried out to investigate the effect of Young’s modulus,
	failure strain, and thickness of the element to be used as a spacer
	in order to determine the best possible candidate material. Three
	tests on 2.5-m-long beams were carried out, and different anchorage
	techniques were used to try and prevent the debonding of the strengthening
	system. The results from this pilot study are very promising, as
	the strengthening system ensures an adequate initial stiffness along
	with an improved ultimate flexural capacity.},
  doi = {10.1007/s11029-008-9020-2},
  issn = {0191-5665},
  url = {http://dx.doi.org/10.1007/s11029-008-9020-2}
}
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