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Shear Behaviour and Design of FRP RC Beams (bibtex)
by Maurizio Guadagnini
Abstract:
This thesis investigates the shear behaviour of concrete beams reinforced with Fibre Reinforced Polymer (FRP) reinforcement. Current design approaches, which are based on modifications of equations derived for steel reinforcement, underestimate the contribution of concrete and shear reinforcement to the total shear capacity. The main aim of this study was to identify the shear resisting mechanisms for FRP RC and to develop less conservative design recommendations. Six beams were subjected to two successive phases of testing. Half of the beams were reinforced in flexure with conventional steel reinforcement, while the other half were reinforced with glass fibre (GFRP) bars. Different shear span to depth ratios were used, ranging from 1 to 3, in order to study differences in the shear transfer mechanisms. No shear reinforcement was provided in the first phase of testing, while in the second phase, just enough glass and carbon shear reinforcement was provided to enable failure due to shear. The results of the tests confirm the very conservative nature of existing shear design code recommendations for deep beams and FRP RC. Experimental techniques that allow the decomposition of the various components of deformations were attempted and an analytical study was conducted in order to examine, in detail, the deformation characteristics of the beams. It was concluded that the experimental techniques that are currently used have severe limitations, particularly when discrete shear cracking takes place. Accordingly, recommendations for improvements are made. Non-linear numerical analysis techniques were used to further enhance the understanding of shear behaviour of steel RC and FRP RC beams. Although this study shows that satisfactory results can be obtained in terms of load deflection response, significant problems arise when shear is the dominant action and localised cracks occur. New and less conservative recommendations are proposed for the shear design of FRP RC beams, recommendations that were validated by the findings of the experimental work. Concrete shear resistance, the resistance of links, minimum shear reinforcement ratios and maximum shear link spacing are discussed in detail and new equations are proposed. It is estimated that the new recommendations will reduce the shear reinforcement demand by 50 to 70% and the cost of FRP RC beam design by up to 50%.
Reference:
Shear Behaviour and Design of FRP RC Beams (Maurizio Guadagnini), PhD thesis, The University of Sheffield, 2002.
Bibtex Entry:
@PHDTHESIS{Guadagnini2002,
  author = {Maurizio Guadagnini},
  title = {Shear Behaviour and Design of FRP RC Beams},
  school = {The University of Sheffield},
  year = {2002},
  address = {Sheffield, UK},
  month = {February},
  abstract = {This thesis investigates the shear behaviour of concrete beams reinforced
	with Fibre Reinforced Polymer (FRP) reinforcement. Current design
	approaches, which are based on modifications of equations derived
	for steel reinforcement, underestimate the contribution of concrete
	and shear reinforcement to the total shear capacity. The main aim
	of this study was to identify the shear resisting mechanisms for
	FRP RC and to develop less conservative design recommendations.
	
	Six beams were subjected to two successive phases of testing. Half
	of the beams were reinforced in flexure with conventional steel reinforcement,
	while the other half were reinforced with glass fibre (GFRP) bars.
	Different shear span to depth ratios were used, ranging from 1 to
	3, in order to study differences in the shear transfer mechanisms.
	No shear reinforcement was provided in the first phase of testing,
	while in the second phase, just enough glass and carbon shear reinforcement
	was provided to enable failure due to shear. The results of the tests
	confirm the very conservative nature of existing shear design code
	recommendations for deep beams and FRP RC.
	
	Experimental techniques that allow the decomposition of the various
	components of deformations were attempted and an analytical study
	was conducted in order to examine, in detail, the deformation characteristics
	of the beams. It was concluded that the experimental techniques that
	are currently used have severe limitations, particularly when discrete
	shear cracking takes place. Accordingly, recommendations for improvements
	are made.
	
	Non-linear numerical analysis techniques were used to further enhance
	the understanding of shear behaviour of steel RC and FRP RC beams.
	Although this study shows that satisfactory results can be obtained
	in terms of load  deflection response, significant problems arise
	when shear is the dominant action and localised cracks occur.
	
	New and less conservative recommendations are proposed for the shear
	design of FRP RC beams, recommendations that were validated by the
	findings of the experimental work. Concrete shear resistance, the
	resistance of links, minimum shear reinforcement ratios and maximum
	shear link spacing are discussed in detail and new equations are
	proposed.
	
	It is estimated that the new recommendations will reduce the shear
	reinforcement demand by 50 to 70% and the cost of FRP RC beam design
	by up to 50%.},
  owner = {Maurizio},
  timestamp = {2010.06.20}
}
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