Shear strengthening of RC deep beams using externally bonded FRP systems

Islam, Md. Rashedul; Mansur, M. A.; Maalej, Mohamed

doi:10.1016/j.cemconcomp.2004.04.002

Cited by 108 publications

(47 citation statements)

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“…The values of increase in the ultimate strength ranged between 45% and 52% for the beams strengthened with CFRP fabrics, whereas by using CFRP laminates, these values reached to 42% and 66% depending on the arrangement of laminates. A similar study explored the potential use of three various types of CFRP systems for shear strengthening of rectangular deep beams (Islam et al, 2005). In general, although the use of CFRP grids in normal orientation was adopted as the most effective system concerning the amount of material consumed, other systems of CFRP wrap and strips were also found to be equally effective with a total enhancement reached to about 43%.…”

Section: Introductionmentioning

confidence: 99%

“…Up to date, the behavior of RC deep beams strengthened with CFRP composites has received little consideration in the literature and the experimental investigations conducted have been found to be very limited (Zhang et al, 2004, Islam et al, 2005, Lee et al, 2011. Therefore, further experimental investigations are still needed to evaluate the performance of the strengthened deep beams under various strengthening schemes, and hence better understanding of shear and flexural resistance mechanisms associated with the use of CFRP systems could be achieved (NCHRP Report 678, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…In such members, shear is the dominative mode for failures and the shear strength of deep beams is; therefore, a major consideration in their design (Yang et al, 2003, Zhang et al, 2004, Nawy, 2009. In practice, RC deep beams have many useful structural applications in high-rise buildings, offshore structures and in foundation systems (Islam et al, 2005, Lee et al, 2011. Commonly, RC deep beams are used as load transferring structural elements such as transfer girders, supporting the load from one or more columns and transferring it laterally to other columns (Wight & MacGregor, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Shear and Flexural Behavior of Reinforced Concrete Deep Beams Strengthened with CFRP Composites

Al-Ghanem¹,

Al-Asi²,

Abdel-Jaber³

et al. 2017

MAS

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The current research studies the shear and flexural behavior of reinforced concrete (RC) deep beams strengthened with externally bonded carbon fiber-reinforced polymers (CFRP). Using two types of CFRP composites including sheets and laminates, different configurations for shear and flexural strengthening of deep beams were experimentally investigated. In total, twenty specimens of deep beams with cross-sectional dimensions of 190 mm width, 400 mm depth and an overall length of 1 900 mm were casted and tested to failure. Concerning the cracks' formation, failure's modes, ultimate strength and overall stiffness, the performance of the strengthened beams compared to the control beams were evaluated. From the test results, the effectiveness of CFRP technique on enhancing both the shear and flexural capacity of deep beams is verified; however, the efficiency differs variedly depending on the material and the strengthening scheme. Regarding the shear strengthening, using the continuous wrap of two sheets records the highest increase in the ultimate strength with a value exceeds 86% compared only to 36% with the inclined laminates. On the other hand, an enhancement of about 51% is achieved through the flexural strengthening with two layers of sheets and 26% when the laminates are used; both are accompanied by a divergent in the failure mode from flexure to shear.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shear and Flexural Behavior of Reinforced Concrete Deep Beams Strengthened with CFRP Composites

Al-Ghanem¹,

Al-Asi²,

Abdel-Jaber³

et al. 2017

MAS

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“…Extensive studies carried out over the past two decades on RC beams ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T shear-strengthened with EB FRP (Bousselham and Chaallal, 2004, 2006a, b, 2008Carolin and Taljsten, 2005a;Islam et al, 2005;Khalifa et al, 1998;Nanni, 2000, 2002;Leung et al, 2007;Matthys, 2000;Monti and Liotta, 2007;Pellegrino and Modena, 2002Taljsten, 2003;Triantafillou, 1998) have led to many design models (Carolin and Taljsten, 2005b;Chaallal et al, 1998;Chajes et al, 1995;Chen and Teng, 2003a, b;Khalifa et al, 1998;Mofidi and Chaallal, 2011;Monti and Liotta, 2007;Pellegrino and Modena, 2002Taljsten, 2003;Triantafillou, 1998;Triantafillou and Antonopoulos, 2000;Ye et al, 2005), some of which have been adopted in design guidelines (ACI-440.2R, 2008;CNR-DT-200R1, 2013;Concrete-Society, 2012;fib, 2001;GB50608-2010GB50608- , 2010HB305, 2008;JSCE, 2001). The majority of these existing design models have assumed that the shear capacity of the EB FRP shear-strengthened beam (V u ) is a sum of the shear contributions of concrete (V c ), steel shear reinforcements (V s ) and shear strengthening FRP (V f ) based on simple superposition (i.e.…”

Section: Introductionmentioning

confidence: 99%

Full-range FRP failure behaviour in RC beams shear-strengthened with FRP wraps

Chen

Fernando

et al. 2017

International Journal of Solids and Structures

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, Full-range FRP failure behaviour in RC beams shear-strengthened with FRP wraps, International Journal of Solids and Structures (2017), doi: 10.1016/j.ijsolstr.2017 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Many effective shear strengthening procedures [1][2][3][4][5] by externally bonding steel plates or high strength non-metallic fiber laminates to concrete surfaces were developed. However, few drawbacks were also identified in the bonded type strengthening technique [6][7] , such as debonding of external laminates from concrete surface due to interface shear stress concentration at the laminate end, and the long term behavior of the system owing to different coefficients of thermal expansion of concrete, adhesive, and non-metallic fiber laminates.…”

Section: Introductionmentioning

confidence: 99%

Shear strengthening of continuous reinforced concrete T-beams using wire rope units

Yang¹,

Byun²,

Ashour³

2009

Engineering Structures

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A simple unbonded-type shear strengthening technique for reinforced concrete beams using wire rope units is presented. Ten two-span reinforced concrete T-beams externally strengthened with wire rope units and an unstrengthened control beam were tested to failure to explore the significance and shortcomings of the developed unbonded-type shear strengthening technique. The main parameters investigated were the type, amount and prestressing force of wire rope units. All beams tested failed owing to significant diagonal cracks within the interior shear span. However, beams strengthened with closed type wire rope units exhibited more ductile failure than the unstrengthened, control beam or those strengthened with U-type wire rope units. The diagonal cracking load and ultimate shear capacity of beams with closed-type wire rope units were linearly increased with the increase of vertical confinement stresses in concrete owing to the prestressing force in wire rope units, while those of beams with U-type wire rope units were little influenced. It was also observed that average stresses in closed-type wire ropes crossing diagonal cracks at ultimate strength of beams tested were far much higher than those in U-type wire rope units, showing better utilization in case of closedtype wire ropes. The shear capacity of beams with closed-type wire rope units is conservatively predicted using the equations of ACI 318-05 for shear modified to account for the external wire rope units. A numerical formula based on the upper bound analysis of the plasticity theory is also developed to assess the load capacity of continuous T-beams strengthened with wire rope units.Comparisons between measured and predicted shear capacities showed that the coefficient of variation obtained from the mechanism analysis is less than that from the modified ACI 318-05 equations. In addition, the predictions by the mechanism analysis for beams with closed-type wire rope units are in good agreement with test results, regardless of the value of stresses used for the calculation of energy dissipated in wire ropes.

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Shear strengthening of RC deep beams using externally bonded FRP systems

Cited by 108 publications

References 4 publications

Shear and Flexural Behavior of Reinforced Concrete Deep Beams Strengthened with CFRP Composites

Shear and Flexural Behavior of Reinforced Concrete Deep Beams Strengthened with CFRP Composites

Full-range FRP failure behaviour in RC beams shear-strengthened with FRP wraps

Shear strengthening of continuous reinforced concrete T-beams using wire rope units

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