Design of Concrete Flexural Members Strengthened in Shear with FRP

Triantafillou, Thanasis; Antonopoulos, Costas P.

doi:10.1061/(asce)1090-0268(2000)4:4(198)

Cited by 333 publications

(182 citation statements)

References 6 publications

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“…Current American Concrete Institute (ACI 2002 andInternational Federation for Concrete 2001) design guidelines for strengthening RC beams in shear with CFRP are based on empirical design equations derived by Khalifa et al (1998) and Triantafillou and Antonopoulos (2000) respectively. The nominal shear strength 'V n ' is calculated by adding individual contributions calculated for the concrete 'V c ', internal steel stirrups 'V s ', and external FRP composites 'V f ' resulting in the general equation…”

Section: Review Of Current Design Methods For Frp Strengthening In Shearmentioning

confidence: 99%

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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: Review Of Current Design Methods For Frp Strengthening In Shearmentioning

confidence: 99%

“…70 for V f . Triantafillou and Antonopoulos (2000) presented equations for å fe which were derived from a regression analysis of data from 75 beam tests. The characteristic effective strain (å fke ¼ 0 .…”

Section: Calculation Of Effective Stress In Frpmentioning

confidence: 99%

Shear strengthening of reinforced concrete beams with CFRP

Bukhari

Vollum

Ahmad

et al. 2010

Magazine of Concrete Research

101

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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%

“…Note that the average strain in FRP is usually termed the effective FRP strain following Chen and Teng (2003a,b). Given the relatively large failure strain of FRP composites compared to the yield strain of normal steel (Teng et al 2002), the crack width at FRP rupture failure may be large enough to cause the yielding of steel shear reinforcements but compromise the shear resistance mechanism in concrete including the friction along the cracked concrete surfaces, concrete aggregate interlock and dowel action, and thus cause a degradation in c V (Teng et al, 2002;Triantafillou and Antonopoulos, 2000). This phenomenon was first observed in FRP-wrapped columns under cyclic loading (Priestley et al, 1996;Priestley and Seible, 1995).…”

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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“…Most researchers have paid much attention to flexural and shear strengthening beams bonded with FRP by experimental and numerical studies [2][3][4], and the investigated achievements have made significant progress. However, few types of research were involved in the torsional behavior of the beams strengthened with FRP.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Reinforced Concrete Box Beam Strengthened with CFRP U-Wrap Strips Under Torsion

Bunnori

Choong

2016

MATEC Web of Conferences

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Abstract. The present study focuses on the torsional strengthening behavior of reinforced concrete (RC) box section beams that are widely used in bridges. Four RC box beams were fabricated, and three of them were wrapped by carbon fiber-reinforced polymer (CFRP) U-wrap strips with or without longitudinal strips. The different wrapping configuration, cracking angle, failure pattern, and tensile strain of fibers were investigated and discussed accordingly. The experimental results addressed that U-wrap strips strengthening also can upgrade the ultimate torque of beams moderately. In particular, using U-wrap and longitudinal strips to bond the box beams increased the torsional stiffness slightly. The same equation from different codes for calculating RC specimens can accurately predict the ultimate strength of the control beam, but the calculation of the fib model overestimated the torsional strengthening improvement of the wrapped specimens. However, Ghobarah et al. assumed approximately 3000με of the average ultimate fiber strain in calculating the ultimate strength of the wrapped box beams which shows in relatively appropriate agreement with testing results.

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Design of Concrete Flexural Members Strengthened in Shear with FRP

Cited by 333 publications

References 6 publications

Shear strengthening of reinforced concrete beams with CFRP

Shear strengthening of reinforced concrete beams with CFRP

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

Behavior of Reinforced Concrete Box Beam Strengthened with CFRP U-Wrap Strips Under Torsion

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