Structural Behavior of Composite RC Beams with Externally Bonded CFRP

Spadea, Giuseppe; Bencardino, Francesco; Swamy, R.N.

doi:10.1061/(asce)1090-0268(1998)2:3(132)

Cited by 240 publications

(94 citation statements)

References 3 publications

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“…Thus, the CMAS effectiveness is more pronounced in RC beams strengthened with CFRP fabric. The findings in this paper concerning the improvement of strength and increase of ductility in strengthened RC beams, due to applied CMAS anchorages on bonded FRPs, are in agreement with results reported in other studies, where RC beams have been strengthened with FRPs anchored by another way [13,17,41,42]. Thus, the tests executed for this investigation demonstrated the beneficial role of anchoring the U-strips by glass fibre bolts especially on the noticeable increase of ductility levels of RC beams strengthened either with CFRP or GFRP fabrics.…”

Section: Effect Of Cmas Anchoragesupporting

confidence: 92%

“…However, the effectiveness of the FRP strengthening is reduced due to the likelihood of debonding at strains considerably lower than the strain capacity of the FRP. Further studies [13] have shown that properly designed external anchorages of FRP sheets applied to RC beams can lead to increase of the load capacity accompanied with substantial regain of the beam's lost structural ductility. Specifically, it has been shown that the CFRP post-strengthening can lead to a catastrophic brittle failure in the form of plate or sheet peeling in the absence of end sheet anchorages [7], [14] and [15].…”

Section: Introductionmentioning

confidence: 99%

“…The ratio of the length of bonded plate within the shear span of the beam to the length of shear span has been considered as a parameter affecting the plate anchorage of strengthened RC beams with CFRP plates [16]. Some researchers have recommended that, to prevent a catastrophic brittle failure mode of strengthened beams by strip detachment, mechanical anchorage should be provided at the strip ends [13]. It seems that plate or sheet end anchorages have a greater effect in beams that are shorter, with a high ratio of shear force to bending moment, than in longer beams.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Structural Response of Reinforced Concrete Beams Strengthened with Anchored FRPs

Demakos¹,

Repapis²,

Drivas³

2013

TOBCTJ

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Abstract:The beneficial effect of a composite material anchorage system (CMAS) upon the ductility and load capacity of reinforced concrete (RC) beams strengthened either with glass (GFRP) or carbon (CFRP) fabrics was investigated. The anchorage system consisted of U-shaped GFRP or CFRP strip (U-strip) at end of FRP. The U-strips were bonded around the beam section and further anchored by two tufts of glass fibres, each of them embedded at the opposite beam face and specifically in the region of compression zone of the beam web. Experimental evaluations in simply supported lightly reinforced concrete (RC) beams strengthened with one GFRP or a CFRP sheet anchored at its ends by the composite anchorage have shown that their bending capacity has increased by 8% and 17%, respectively, in relation to the capacity attained in similar RC strengthened beams without anchorage. On the other hand, their ductility was improved by an amount of 94% and 37%, respectively. ANSYS finite element program was also used to numerically verify the response of strengthened RC beams obtained experimentally. The numerical results obtained are in good agreement with the experimental, thus, the calibrated model could now be used to extend the experimental results at lower cost.

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Section: Effect Of Cmas Anchoragesupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Structural Response of Reinforced Concrete Beams Strengthened with Anchored FRPs

Demakos¹,

Repapis²,

Drivas³

2013

TOBCTJ

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“…Two measures for the ductility of strengthened beams with FRP composites, namely deflection and energy ductility indices were adopted in the current investigation [11][12][13] as follows: Table 5 gives these two ductility indices for the beams tested calculated at yielding of both sagging and hogging reinforcement. Although all the strengthened beams tested showed higher beam capacity than that of the control beam, the ductility of the strengthened beams was less than that calculated for the control beam.…”

Section: Beam Ductilitymentioning

confidence: 99%

CFRP strengthened continuous concrete beams

El-Refaie¹,

Ashour²,

Garrity³

2003

Structures Bu

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This paper reports the testing of five reinforced concrete continuous beams strengthened in flexure with externally bonded carbon fibre reinforced polymer (CFRP) laminates. All beams had the same geometrical dimensions and internal steel reinforcement. The main parameters studied were the position and form of the CFRP laminates. Three of the beams were strengthened using different arrangements of CFRP plate reinforcement and one was strengthened using CFRP sheets. The performance of the CFRP strengthened beams was compared with that of an unstrengthened control beam. Peeling failure was the dominant mode of failure for all the strengthened beams tested. The beam strengthened with both top and bottom CFRP plates produced the highest load capacity. It was found that the longitudinal elastic shear stresses at the adhesive/concrete interface calculated at beam failure were close to the limiting value recommended in the Concrete Society Technical Report 55.

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“…Consequently, many studies have been carried out in order to understand the failure mechanism of plated or connected beams [1][2][3][4][5][6][7][8][9][10][11][12][13][14] or laminated glass [15]. These studies converge to an important aspect: the presence of shear and normal stresses at the plate-core interface.…”

Section: Introductionmentioning

confidence: 99%

Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical–numerical investigation

Krour

Bernard

Tounsi

2013

Engineering Structures

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Important failure mode of such plated beams is the debonding of the FRP plates from the concrete due to high level of stress concentration in the adhesive at the ends of the FRP plate. This paper presents a new method for reducing interfacial stresses in a concrete beam bonded with the FRP plate by including the effect of the fiber orientation in the FRP plate. This work is divided into two parts; the first one is based on the laminates theory for the analytical solution where a minimization method is used to directly determine the fiber orientation reducing the interfacial stresses. The second part consists into a Finite Element modeling where the analytical solution and different fibers orientation combinations are tested for improving strengthening quality. Numerical results from the present analysis are presented in order to show the advantages of the present solution over existing ones and to reconcile debonding stresses with strengthening quality.

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Structural Behavior of Composite RC Beams with Externally Bonded CFRP

Cited by 240 publications

References 3 publications

Investigation of Structural Response of Reinforced Concrete Beams Strengthened with Anchored FRPs

Investigation of Structural Response of Reinforced Concrete Beams Strengthened with Anchored FRPs

CFRP strengthened continuous concrete beams

Fibers orientation optimization for concrete beam strengthened with a CFRP bonded plate: A coupled analytical–numerical investigation

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