Effectiveness of externally bonded CFRP strips for strengthening flanged beams under torsion: An experimental study

Deifalla, Ahmed Farouk; Awad, Ahmed; Elgarhy, M.

doi:10.1016/j.engstruct.2013.08.027

Cited by 68 publications

(28 citation statements)

References 19 publications

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“…Alabdulhady et al (2017) used PBO-FRCM composites to improve torsional resistance of reinforced concrete beams. Zhang et al (2001), Hii and Al-Mahaidi (2006), Jing et al (2007), Mohammadizadeh and Fadeel (2009) and Deifalla et al (2013) worked on the torsional behavior of different types of reinforced concrete beam externally strengthened with carbon fiber reinforced polymer (CFRP).…”

Section: Torsional Strengthening Of Beamsmentioning

confidence: 99%

Study of torsional behavior of reinforced concrete beams strengthened with aramid fiber strips

Kandekar¹,

Talikoti

2018

Int J Adv Struct Eng

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This paper investigates the strengthening of reinforced concrete (RC) beams for its torsional behavior using aramid fiber strips. Most of the time aramid fiber is used as an externally bonded reinforcement to increase flexural and shear strength of RC beams. An attempt is made to use it for improving torsional moment carrying capacity of RC beam. Torsional failure mostly occurs in earthquake prone areas subjected to rapid failure. Brittle failure of structures occurs due to torsional moment. Different patterns of aramid fiber strips are selected to wrap around RC beams and torsional behavior of these strengthened beams is studied. RC beam of M30 grade of concrete is strengthened with aramid fiber strips and tested for torsional failure using lever arms subjected to torque. The beam size is 150 mm × 300 mm and of 1.3 m in length, designed as per IS456-2000. A total of 21 numbers of reinforced concrete rectangular beams were cast for the experimental study. Three are taken as controlled beams with normal reinforcement, 3 beams are designed with torsional reinforcement and other 15 beams with normal reinforcement have grouped in five sets. These five sets are strengthened using aramid fiber strips of 150 mm width with variable spacing of 100, 125, 150, 175 and 200 mm, respectively. The effect of different configuration of aramid fiber on torsional moment carrying capacity, angle of twist and failure mode of the beams is studied.

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Section: Torsional Strengthening Of Beamsmentioning

confidence: 99%

Study of torsional behavior of reinforced concrete beams strengthened with aramid fiber strips

Kandekar¹,

Talikoti

2018

Int J Adv Struct Eng

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“…But inaccessibility and extension of flanges over the web has necessitated strengthening the beams by "U" wrap rather than full wrap (Behera et al, 2008). For quantification of torsional strength of "U" wrapped beams very few attempts have been made by (Panchacharam and Belarbi, 2002;Deifalla et al, 2013). U-jacketed flanged beams exhibited premature debonding failure at the concrete and the FRP sheet adhesive interface Chalioris (2008).…”

Section: Significance Of Present Investigationmentioning

confidence: 99%

Torsional behaviour of normal strength RCC beams with ferrocement “U” wraps

Behera

Dhal²

2018

FACTA U SERIES ARCHI

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Wrapping technology is one of the effective ways of strengthening concrete elements. Several researchers reported the effectiveness of Glass fiber reinforced polymers and carbon fiber reinforced polymers for improving the strength of the concrete elements. Wrapping on three sides is one of the effective methods for strengthening the beams supporting slabs. Scant literature is available on the strength enhancement of ?U? wrapped concrete elements subjected to torsional loads. In this investigation an attempt is made to quantify the improvement in the behaviour of ?U? wrapped rectangular concrete members subjected to torsional loads ?U? wraps. Ferrocement is taken here as wrapping material. Beams were cast with different number of mesh layers with different torsional reinforcement. The beams were analyzed with MARS. The predictions are in good agreement with experimental test results.

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“…Research on torsional strengthening is quite limited in comparison with shear and flexural strengthening and it is only limited to the use of EBR-FRP [5], [6], [7], [8], [9], [10], [11], [12], [13] and [14]. This previous research has explored the influence on the torsional strengthening effectiveness of the following main parameters: FRP strengthening ratio, number of the strengthened sides of the member (four-and three-sides), strengthening configuration (full wrapping versus discrete strips), interaction between flexure and shear strengthening.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of torsional strengthening on thin walled tubular reinforced concrete structures using NSM-CFRP laminates

Gowda

Barros

Guadagnini

2019

Composite Structures

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Although the use of near surface mounted (NSM) reinforcement for shear and flexural strengthening of reinforced concrete (RC) structures has been examined extensively in the past twenty years, its performance as torsional strengthening solution has never been assessed. This paper presents an experimental program on the use of NSM carbon fibre reinforced polymer (CFRP) laminates to enhance the torsional behaviour of RC thin walled tubular elements. Six specimens were tested as part of this work, including two reference specimens and the remaining four strengthened with different configurations of longitudinal and transverse CFRP laminates. The research shows that the addition of NSM CFRP laminates is very effective in increasing the torsional moment carrying capacity, stiffness and torsional deformability, and arresting the crack propagation, with imperceptible alteration of the geometry of the strengthened element.

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Effectiveness of externally bonded CFRP strips for strengthening flanged beams under torsion: An experimental study

Cited by 68 publications

References 19 publications

Study of torsional behavior of reinforced concrete beams strengthened with aramid fiber strips

Study of torsional behavior of reinforced concrete beams strengthened with aramid fiber strips

Torsional behaviour of normal strength RCC beams with ferrocement “U” wraps

Experimental study of torsional strengthening on thin walled tubular reinforced concrete structures using NSM-CFRP laminates

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