Effect of Longitudinal Carbon Fiber-Reinforced Polymer Plates on Shear Strength of Reinforced Concrete Beams

Nawaz, Waleed; Hawileh, Rami A.; Saqan, Elias I.; Abdalla, Jamal A.

doi:10.14359/51688475

Cited by 35 publications

(15 citation statements)

References 13 publications

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“…Due to the advantages of high strength and stiffness to weight ratios as well as superior corrosion resistance, fibre reinforced polymer (FRP) has been extensively used in recent years to improve the compressive, flexural, and shear behaviours of concrete members [1][2][3][4][5][6]. One popular application of FRP is to provide confinement to concrete columns [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models

Wang

Sheikh

Al-Baali

et al. 2018

Construction and Building Materials

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This study provides new insight on the compressive behaviour of partially fibre reinforced polymer (FRP) confined concrete with either strain-hardening or strain-softening responses. Fully FRP confined concrete, partially FRP confined concrete with different strip gaps, and unconfined concrete were tested under axial compression. Four types of axial load-axial deformation behaviours were observed for specimens with different strip gaps. Even though a high volumetric ratio of FRP was applied, the confinement effectiveness was negligible when the strip gap exceeded the diameter of the specimens. Moreover, the axial stress-axial strain behaviours of wrapped and non-wrapped concrete were observed to be different, and significant strain localization was observed within the non-wrapped region. Based on the experimental observations and an extensive literature review, a confinement effectiveness coefficient was proposed for partially FRP confined concrete. A stress-strain model was then developed by considering the proposed confinement effectiveness coefficient. The developed stress-strain model provided better predictions than other existing stress-strain models.

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Section: Introductionmentioning

confidence: 99%

Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models

Wang

Sheikh

Al-Baali

et al. 2018

Construction and Building Materials

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“…The results showed that there is a considerable increase in the shear capacity of deficient beams exceeding 90% [29]. Hawileh et al [32,33] and Nawaz et al [34] investigated the effect of longitudinal flexural reinforcement of CFRP sheets and plates on shear capacity of RC beams.…”

Section: Shear Strengthening Using Frpmentioning

confidence: 99%

“…They concluded that the increase in the capacity of the specimens strengthened with longitudinal CFRP sheets was in the range of 10% to 70% [32] and for those strengthened with longitudinal CFRP plates was in the range of 13% to 138% [34] compared to the control specimens. The effect of U-jacketing or U-wrapping using CFRP and GFRP sheets on shear strengthening of RC beams was also studied by several investigators [2,6,11,12,16,[35][36][37].…”

Section: Shear Strengthening Using Frpmentioning

confidence: 99%

Shear strengthening of reinforced concrete beams using externally-bonded aluminum alloy plates: An experimental study

Abdalla

Abu-Obeidah

Hawileh

et al. 2016

Construction and Building Materials

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Recently developed high strength Aluminum Alloys (AA) have desirable characteristics that make them attractive as externally bonded strengthening materials. This paper investigates the potential of using AA plates for shear strengthening of reinforced concrete (RC) beams. Five shear deficient RC beams were externally strengthened using AA plates with different orientations. It is observed that the shear capacity of the strengthened beams has increased in the range of 24%-89% compared to the un-strengthened beam. Shear capacity of the strengthened beams was also predicted using the ACI440, FIB14, TR55 and SMCFT design guidelines with the later one giving the most accurate predictions.

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“…All reported significant increase in shear capacity due to use of anchors. Furthermore, contributions of externally bonded flexural CFRP laminates in the shear strengthening of RC beams have been investigated by several researchers [ 40 , 41 , 42 , 43 ]. Shear strengthening of RC beams is usually achieved by externally bonding CFRP sheets or plates to the vertical sides of the beam’s web with different orientation and spacing using epoxy adhesives.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, flexural reinforcement using CFRP sheets or plates, which are attached to the beam’s soffit, has been used to increase the shear capacity of RC beams. Hawileh et al [ 40 , 41 ] carried out an experimental study to assess the contributions of flexural CFRP sheets on the shear capacity of RC beams, while Nawaz et al [ 42 ] and Saqan et al [ 43 ] conducted experimental investigation to evaluate the contributions of flexural CFRP plates on the shear capacity of RC beams. They concluded that the shear capacity of RC beams strengthened with CFRP sheets as flexural reinforcement increased by about 10–70% over the control unstrengthened specimen and by about 13–138% for those strengthened with CFRP plates as flexural reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates

2020

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Reinforced concrete (RC) beams strengthened in shear with carbon fiber reinforced polymer (CFRP) laminates as externally bonded reinforcement (EBR) usually fail due to debonding. This paper presents an experimental and analytical investigation on the use of groove-epoxy as an anchorage system for CFRP plates and sheets bonded on both sides of shear deficient RC beams. The aim of this study is to assess the effectiveness of using groove-epoxy in enhancing the shear capacity of RC beams. Nine rectangular RC beams were strengthened with CFRP plates and sheets with groove-epoxy anchorage systems of different groove widths and tested under four point bending. It is observed that the RC beams strengthened with the groove-epoxy anchorage system showed an increase in the shear-strength over the unstrengthened control beam up to 112 and 141% for plates and sheets, respectively. Also, the increase of shear-strength contribution of the groove-epoxy system to that of CFRP without grooves ranged between 30–190% for CFRP plates and between 40–100% for CFRP sheets. Generally, the contributions of groove-epoxy on shear-strength decreased with the increase of groove width. Moreover, shear strength prediction models, based on modifications of the ACI440.2R-17 shear model, were developed by incorporating groove factors as a modifier to the FRP shear-strength contribution. The developed models predicted the experimental shear-strength of the tested RC beams with a good level of accuracy, with an average mean absolute percent error (MAPE) = 3.31% and 6.68%, normalized mean square error (NMSE) = 0.072, 0.523, and coefficient of determination R2 = 0.964, 0.691, for plates and sheets, respectively.

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Effect of Longitudinal Carbon Fiber-Reinforced Polymer Plates on Shear Strength of Reinforced Concrete Beams

Cited by 35 publications

References 13 publications

Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models

Compressive behaviour of partially FRP confined concrete: Experimental observations and assessment of the stress-strain models

Shear strengthening of reinforced concrete beams using externally-bonded aluminum alloy plates: An experimental study

Experimental and Analytical Investigations of the Use of Groove-Epoxy Anchorage System for Shear Strengthening of RC Beams Using CFRP Laminates

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