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Journal ArticleDOI

Failure Mode Analyses of Reinforced Concrete Beams Strengthened in Flexure with Externally Bonded Fiber-Reinforced Polymers

TLDR
In this paper, a nonlinear RC beam element model with bond-slip between the concrete and the fiber-reinforced polymer plate is used to study how the failure mechanism of simply supported strength-ened RC beams is affected by the following parameters: plate length, plate width, plate stiffness, and loading type.
Abstract
As existing structures age or are required to meet the changing demands on our civil infrastructure, poststrengthening and retrofitting are inevitable. A relatively recent technique to strengthen reinforced concrete ~RC! beams in flexure uses fiber-reinforced polymer ~FRP! strips or sheets glued to the tension side of the beam. A number of researchers have reported that the failure mode of an FRP-strengthened RC beam can change from the desired ductile mode of an underreinforced beam to a brittle one. This paper analyzes the effects of this strengthening technique on the response and failure modes of a reference RC beam. A nonlinear RC beam element model with bond-slip between the concrete and the FRP plate is used to study how the failure mechanism of simply supported strength- ened RC beams is affected by the following parameters: plate length, plate width, plate stiffness, and loading type. The beam geometry is kept constant. The parametric studies confirm the experimentally observed results according to which the most commonly observed failure modes due to loss of composite actions are affected by the plate geometric and material properties. In addition, distributed loads ~difficult to apply in an experimental test! may not be as sensitive to plate debonding in the region of maximum bending moment as are beams subjected to point loads.

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Journal Article

Flexural testing of high strength reinforced concrete beams strengthened with cfrp sheets

TL;DR: In this article, the authors investigated the effectiveness of externally bonded CFRP sheets to increase the flexural strength of reinforced high strength concrete (HSC) beams, and the ductility characteristics of the test beams were evaluated in terms of the displacement, curvature and energy ductility index.
Journal ArticleDOI

Ductility Enhancement of Sustainable Fibrous-Reinforced High-Strength Lightweight Concrete

TL;DR: In this article , steel fibers from 0.50% to 1.5% were used in the concrete mix to improve the ductility of high-strength, lightweight concrete by incorporating steel fibers.

Modelling of debonding phenomena in frp-strengthened concrete beams and slabs

Ahmed Godat
TL;DR: In this paper, the authors deal with the finite element modelling of the bond behaviour of concrete beams and slabs strengthened with externally bonded FRPs and assess the appropriate constitutive models for the FRP/concrete interface.
Journal ArticleDOI

Evaluation of debonding failure of reinforced concrete girders strengthened in flexure with FRP laminates using finite element modeling

TL;DR: In this article, a nonlinear RC beam element with bond-slip between the concrete and the FRP laminates is developed and used to analyze several test specimens and to investigate their corresponding failure mode.
Journal ArticleDOI

Influence of width and thickness of composite laminates on the flexural behavior of reinforced concrete beams and slabs

TL;DR: In this paper, an experimental study on 10 reinforced concrete members externally reinforced with different architectures of carbon fiber reinforced polymer (CFRP) laminates is presented to investigate the influence of the composite configurations on the structural behavior of RC members.
References
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Journal ArticleDOI

Significance of midspan debonding failure in frp-plated concrete beams

TL;DR: In this paper, it is shown that mid-pan debond action is triggered by high shear stresses transmitted from the plates through the adhesive to the cover concrete and corrosion of the embedded steel.
Journal ArticleDOI

Behavioral trends of rc beams strengthened with externally bonded frp

TL;DR: The performance of conventionally reinforced concrete (RC) beams strengthened in flexure with externally bonded fiber-reinforced polymers (EB-FRP) was studied by compiling and analyzing an experimental database.
Journal ArticleDOI

Ultimate Response of RC Beams Strengthened with CFRP Plates

TL;DR: In this article, the authors present the results of flexural tests on ten reinforced concrete beams strengthened with different plate configurations, and a strain compatibility and force equilibrium method of analysis, coupled with an empirical rule derived from the test data, is demonstrated to be effective in predicting the ultimate response of simply supported beams in bending with and without end plate anchorages and irrespective of plate length.
Journal ArticleDOI

Parametric Study of Beams with Externally Bonded FRP Reinforcement

TL;DR: In this paper, a parametric analysis is conducted to investigate the effects of FRP reinforcement on serviceability, strength, and failure mechanisms of repaired RC beams, and the results of the analysis are shown in terms of repaired-to-unrepaired strength and deflection ratios.
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