Rehabilitation of rectangular simply supported RC beams with shear deficiencies using CFRP composites

Khalifa, Ayman M.; Nanni, Antonio

doi:10.1016/s0950-0618(02)00002-8

Cited by 250 publications

(103 citation statements)

References 2 publications

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“…Khalifa et al's (1998) Equation 4a gives an upper bound to R, which is frequently overridden by Equation 4b, which is based on bond failure. Equation 11 of Zhang and Hsu (2005) also gives an upper bound to R. Figure 4 shows that the relationship between the effective strain in the FRP and its axial rigidity is also evident in data from tests carried out by Khalifa and Nanni (2002) and the current authors in which the sheet thickness and the width of the beam were not varied. The authors consider there to be a genuine relationship between the axial rigidity of CFRP and å fe which should be accounted for in design.…”

Section: Assessment and Development Of Existing Design Recommendationsmentioning

confidence: 76%

Shear strengthening of reinforced concrete beams with CFRP

Bukhari

Vollum

Ahmad

et al. 2010

Magazine of Concrete Research

101

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The current paper reviews existing design guidelines for strengthening beams in shear with carbon fibre reinforced polymer (CFRP) sheets and proposes a modification to Concrete Society Technical Report TR55. It goes on to present the results of an experimental programme which evaluated the contribution of CFRP sheets towards the shear strength of continuous reinforced concrete (RC) beams. A total of seven, two-span concrete continuous beams with rectangular cross-sections were tested. The control beam was not strengthened, and the remaining six were strengthened with different arrangements of CFRP sheets. The experimental results show that the shear strength of the beams was significantly increased by the CFRP sheet and that it is beneficial to orientate the FRP at 458 to the axis of the beam. The shear strength of FRP strengthened beams is usually calculated by adding individual components of shear resistance from the concrete, steel stirrups and FRP. The superposition method of design is replaced in Eurocode 2 by the variable angle truss model in which all the shear is assumed to be resisted by the truss mechanism. The current paper proposes a methodology for strengthening beams with FRP that is consistent with Eurocode 2.

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Section: Assessment and Development Of Existing Design Recommendationsmentioning

confidence: 76%

Shear strengthening of reinforced concrete beams with CFRP

Bukhari

Vollum

Ahmad

et al. 2010

Magazine of Concrete Research

101

View full text Add to dashboard Cite

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“…Other major characteristics of FRP include its high strength to weight ratio, it has non-conductive, non-corrosive and nonmagnetic properties and is resistant to chemical attack [3,4]. It has also been reported by Alferjani et al [5], Ali et al [6] and Shahidan et al [7] that the application of the FRP composites has been proven to increase the service life contributing to the structures longevity.…”

Section: Introductionmentioning

confidence: 94%

Sustainable Shear Behaviour of 2-Span Continuous Reinforced Concrete T-Beams with CFRP Strips

et al. 2017

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Abstract. Reinforced concrete (RC) structures are generally subjected to various load conditions and are susceptible to environmental impact. With time, most of these structures will be subjected to change in their usage. Unexpected increase in load changes may cause severe damage to the structural components, and eventual leading to various types of structural failure. It is noted that shear failure in nature is a sudden failure and should be avoided at all times. To increase its service life due to shear, structures can be strengthened or repaired using CFRP strips wrapped within the shear span (a v ) of the beam. Hence, this paper presents an investigation on the sustainable behaviour of two span continuous RC T-beams strengthened and repaired by wrapping Carbon Fibre Reinforced Polymer (CFRP) strips at intervals along the shear span (a v ) of the beam. The CFRP strips will be orientated in two directions either at 0°/90° or 45°/35°. Five beams, one control beam, two initially strengthened beams and two precracked and repaired beams were cast and cured in room temperature before testing. All T-beams were designed to fail in shear and are subjected to four-point bending test until failure. Upon completion of the test, all beam specimens shows good sustainable behaviour as the ultimate load and shear load shows an increase in capacity by up to 23% with improve ductile behaviour.

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“…Trianafillou (1998) tested beams with a length of 1000 mm, width of 70 mm and height of 110 mm and the shear reinforcement of which is not used by adhering their surfaces GFRP plate with different angle in the study performed. Khalifa and Nanni (2002) increased the shear strength of beams using GFRP in the different angle in the test specimens with T cross-section in the study they performed. Kachlakev and McCurry (2000) tested 4 beams with insufficient shear strength in the study they performed.…”

Section: Introductionmentioning

confidence: 97%

Effect of Anchorage Number on Behavior of Reinforced Concrete Beams Strengthened with Glass Fiber Plates

Kaya

Kankal

2015

International Journal of Concrete Structures and Materials

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Reinforced concrete beams with insufficient shear reinforcement were strengthened using glass fiber reinforced polymer (GFRP) plates. In the study, the effect of the number of bolts on the load capacity, energy dissipation, and stiffness of reinforced concrete beams were investigated by using anchor bolt of different numbers. Three strengthened with GFRP specimens, one flexural reference specimen designed in accordance to Regulation on Buildings Constructed in Disaster Areas rules, and one shear reinforcement insufficient reference specimen was tested. Anchorage was made on the surfaces of the beams in strengthened specimens using 2, 3 and 4 bolts respectively. All beams were tested under monotonic loads. Results obtained from the tests of strengthened concrete beams were compared with the result of good flexural reference specimen. The beam in which 4 bolts were used in adhering GFRP plates on beam surfaces carried approximately equal loads with the beam named as a flexural reference. The amount of energy dissipated by strengthened DE5 specimen was 96 % of the amount of energy dissipated by DE1 reference specimen. Strengthened DE5 specimen initial stiffness equal to DE1 reference specimen initial stiffness, but strengthened DE5 specimen yield stiffness about 4 % lower than DE1 reference specimen yield stiffness. Also, DE5 specimen exhibited ductile behavior and was fractured due to bending fracture. Upon the increase of the number of anchorages used in a strengthening collapsing manner of test specimens changed and load capacity and ductility thereof increased.

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Rehabilitation of rectangular simply supported RC beams with shear deficiencies using CFRP composites

Cited by 250 publications

References 2 publications

Shear strengthening of reinforced concrete beams with CFRP

Shear strengthening of reinforced concrete beams with CFRP

Sustainable Shear Behaviour of 2-Span Continuous Reinforced Concrete T-Beams with CFRP Strips

Effect of Anchorage Number on Behavior of Reinforced Concrete Beams Strengthened with Glass Fiber Plates

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