Design against premature peeling failure of RC beams with externally bonded steel or FRP plates

Hassanen, M.A.H.; Raoof, Mohammed

doi:10.1680/macr.2001.53.4.251

Cited by 11 publications

(3 citation statements)

References 12 publications

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“…Recently, because of increased vehicle loads and carrying capacities, much construction work has been performed to improve the grades of bridge structures from grade 2 bridges to grade 1 bridges. In addition, with the development of new construction materials (Malek and Saadatmanesh, 1996), such as carbon fibre composite sheets (CFS), aramid fibre composites and glass fibre composites, the repair and strengthening of aged concrete structures have been increasingly studied in recent years (Arduini and Nanni, 1997;Hassanen and Raoof, 2001;Jin et al, 1994;Karabinis and Rousakis, 2002;Kim and Sebastian, 2002;Lees and Burgoyne, 1999;Sen et al, 1993Sen et al, , 1994Triantafillou and Plevris, 1992). It has been increasingly noted that, not only for general RC structures, but also for concrete structures of nuclear power plants (NPP), strengthening methods using fibre reinforcement are very useful and effective in terms of improving the structural capacity against external missile impact.…”

Section: Introductionmentioning

confidence: 99%

Effect of hybrid fibre reinforcement on capacity of reinforced concrete beams

Cho²

2013

Proceedings of the Institution of Civil Engineers - Structures

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This study evaluates the flexural behaviour of reinforced concrete beams strengthened by hybrid fibre reinforcement.Hybrid fibre reinforcement prepared in two ways is considered: using a hybrid fibre sheet and a hybrid fibre plate.Experimental research on the feasibility and applicability of strengthening effects due to hybrid fibre plate and hybrid fibre sheet in reinforced concrete beams has been carried out. Each of control and seven specimens strengthened by hybrid fibre sheet and hybrid fibre plate was tested by four-point bending tests using a hydraulic universal testing machine. For hybrid fibre sheet specimens, debonding between the adhesive and the beam that propagates from the end of the plate has been observed in experiments. According to the test results, reinforced concrete beams strengthened by hybrid fibre reinforcement showed approximately 60-200% higher load capacities and strengths relative to unreinforced specimens. In addition, all reinforced beams showed an ideal failure pattern, with the presentation of ductile behaviour after yielding of the reinforcing bar. More specifically, in the cases of reinforced concrete beams reinforced with hybrid fibre plate, no difference according to the puttying method was apparent, since the hybrid fibre plate-retrofitted reinforced concrete beams reinforced using epoxy injection and adhesive bonding showed similar failure patterns.

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Section: Introductionmentioning

confidence: 99%

Effect of hybrid fibre reinforcement on capacity of reinforced concrete beams

Cho²

2013

Proceedings of the Institution of Civil Engineers - Structures

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“…Extensive theoretical and experimental studies focused on end-anchorage of the additional steel reinforcement; e.g. [1][2][3][4][5][6][7] . These studies led to suitable guidelines for the post-strengthening of slabs and beams.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on the Bonding Failure between CFRP and Concrete in RC Two-Way Slabs Strengthened with CFRP Strips

Sun

Zhao

Jiang

2012

AMM

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It is well known that the bonding failure between concrete and externally bonded CFRP strips sets in where high shear forces and high bending moments occur. Despite this knowledge, experimental and theoretical studies had been exclusively focused on the bonding failure modes at the end of the CFRP-strip. This paper deals with strengthening of RC two-way slabs with CFRP strips bonded to the tensile face. It focuses on the bonding failure by dealing with an experimental study. The CFRP-strips strengthened slab test presents a failure mode with debonding of the external CFRP strips from the slab.

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“…Where external FRP reinforcement is used, loss of ductility can be attributed to separation of the FRP from the concrete owing to brittle failure of the FRP-to-concrete connection as reported primarily in the conference proceedings edited by Burgoyne 2 and in other work. [3][4][5][6] Alternatively, if appropriate FRP-to-concrete anchorage is provided, section failure occurs by concrete crushing or by rupture of the FRP. Even so, reduced ductility exists owing to the linear constitutive behaviour of the FRP up to failure.…”

Section: Introductionmentioning

confidence: 99%

Analysis of concrete structures across the ductility spectrum

Sebastian¹,

Zhang²

2008

Magazine of Concrete Research

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This paper presents a computational technique for time-efficient prediction of the ultimate loads of indeterminate reinforced concrete (RC) structures of different ductility levels. The method is based on the submission of section flexural stiffnesses for the structure into linear structural analysis. An iterative approach is employed, which eventually harmonises the stiffness input to the analysis with the moments output from the analysis, while also activating the failure stress resultant(s) at the critical location(s) of the structure. Softening of stiffness distributions owing to factors such as fracture of reinforcement-to-concrete connections is discussed. The technique is illustrated by way of examples including a ductility-compromised frame and multi-span continuous beams, which possess varying levels of ductility. Uncertainties in quantifying initial stress resultants in structures targeted for strengthening are discussed. It is concluded that the method shows promise for rapid ultimate analysis of highly indeterminate RC structures.

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Design against premature peeling failure of RC beams with externally bonded steel or FRP plates

Cited by 11 publications

References 12 publications

Effect of hybrid fibre reinforcement on capacity of reinforced concrete beams

Effect of hybrid fibre reinforcement on capacity of reinforced concrete beams

Experimental Studies on the Bonding Failure between CFRP and Concrete in RC Two-Way Slabs Strengthened with CFRP Strips

Analysis of concrete structures across the ductility spectrum

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