Shear strengthening effect by bonded composite fabrics on RC beams

Li, A; Diagana, Cheikhna; Delmas, Yves

doi:10.1016/s1359-8368(02)00003-3

Cited by 48 publications

(10 citation statements)

References 6 publications

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“…As a result, at the instance of debonding failure, the component of shear resistance from concrete is likely to be well maintained (e.g. Bousselham and Chaallal 2008), but the component of shear resistance from steel may be significantly below what is expected in a conventional RC beam because not all steel stirrups in an FRP-strengthened RC beam intersected by the critical shear crack can reach yielding at the shear failure of the beam (Ali et al 2006;Chen et al 2010;Deniaud and Cheng 2001;Li et al 2002;Monti and Liotta 2007;Pellegrino and Modena 2008;Teng et al 2002;Teng et al 2004). It may be noted that this adverse shear interaction effect has not been duly considered in any of the existing design guidelines (Chen 2010).…”

Section: Introductionmentioning

confidence: 99%

Shear Strength Model for FRP-Strengthened RC Beams with Adverse FRP-Steel Interaction

2013

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RC beams shear-strengthened with externally-bonded FRP U-strips or side strips usually fail due to debonding of the bonded FRP shear reinforcement. Because such debonding usually occurs in a brittle manner at relatively small shear crack widths, some of the internal steel stirrups intersected by the critical shear crack may not have reached yielding at beam shear failure. Consequently, the yield strength of internal steel stirrups in such a strengthened RC beam cannot be fully utilized. This adverse shear interaction between the internal steel shear reinforcement and the external FRP shear reinforcement may significantly reduce the benefit of the shear-strengthening FRP but has not been considered explicitly by any of the shear strength models in the existing design guidelines. This paper presents a new shear strength model considering this adverse shear interaction through the introduction of a shear interaction factor. A comprehensive evaluation of the proposed model, as well as three other shear strength models, is conducted using a large test database. It is shown that the proposed shear strength model performs the best among the models compared, and the performance of the other shear strength models can be significantly improved by including the proposed shear interaction factor. Finally, a design recommendation is presented. This is the Pre-Published Version. CE Database subject headings: 2 INTRODUCTIONThe external bonding of fiber-reinforced polymer (FRP) to reinforced concrete (RC) structures has become a popular strengthening technique in the past decade; the technique has also received much research attention (Bank 2006; Hollaway and Teng 2008; Oehlers and Seracino 2004; Teng et al. 2002). In particular, the shear resistance of RC beams can be enhanced by bonding FRP shear reinforcement in the forms of complete wraps, U-jackets and side strips (Chen and Teng 2003a, b; Teng et al. 2002). Without loss of generality, the FRP shear reinforcement is assumed herein to be in the form of discrete strips for ease of discussion; a continuous sheet with fibres oriented in a single direction can be treated as discrete strips in the fibre direction with a zero net gap between strips.Existing research has established a general picture of the structural behaviour of RC beams shear-strengthened with FRP and led to a number of shear strength models for them (Chen and Teng 2003a, b; Khalifa et al. 1998; Monti and Liotta 2007; Triantafillou 1998; Triantafillou and Antonopoulos 2000); the more reliable of these shear strength models have been adopted by design guidelines (ACI-440.2R 2008; CNR-DT200 2004; fib 2001; HB305 2008). A comprehensive review of existing work (Chen 2010), however, reveals that several aspects of the behaviour of such strengthened beams are still not well understood. In particular, the adverse interaction between the different components of shear resistance (Ali et al. 2006; Chen et al. 2010; Pellegrino and Modena 2002, 2006, 2008 has been identified as a major issue that requires furt...

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Section: Introductionmentioning

confidence: 99%

Shear Strength Model for FRP-Strengthened RC Beams with Adverse FRP-Steel Interaction

2013

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“…An extensive literature review has been carried out to collect test data of RC beams strengthened with anchoraged FRP composites. Seventy-three RC beams strengthened with anchoraged FRP reinforcements were collected from the literature (Sato et al, 1997;Mitsui et al, 1998;Khalifa et al, 1999;Nanni, 2000, 2002;Chaallal et al, 2002a;Li et al, 2002;Adhikary et al, 2004;Xuesong and Zhongfan, 2004;Anil, 2006Anil, , 2008Bousselham and Chaallal, 2006;Monti and Liotta, 2007;Sakar, 2008Sakar, , 2009Quinn, 2009;Altin et al, 2010;Chaallal et al, 2002). Subsequently, six sheardeficient RC beams strengthened with different CFRP configurations were tested in the laboratory by the author (Tanarslan et al, 2008;Tanarslan, 2010a).…”

Section: Experimental Datamentioning

confidence: 99%

An anticipated shear design method for reinforced concrete beams strengthened with anchoraged carbon fiber‐reinforced polymer by using neural network

Tanarslan

Kumanlıoğlu

Şakar

2014

Structural Design Tall Build

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SUMMARY Using externally bonded carbon fiber‐reinforced polymer (FRP) for strengthening has been turned into a popular decision owing to its mechanical leads. Consequently, design guidelines and researchers have established several analytical equations to predict the contribution of FRP to ultimate shear capacity. The developed analytical equations projected the influence of FRP reinforcements within certain limits. However, not mentioned parameters such as the shear span‐to‐depth ratio and anchorage application influence the ultimate behavior of strengthened specimens. Accordingly, distant predictions between test results and code predictions are observed for the specimens in whom anchorage is applied. As an alternative method, artificial neural network (NN) can be used to predict the contribution of anchoraged carbon FRP to shear strength of deficient reinforced concrete beams. Accordingly, two NN models with back‐propagation are developed in this study. Unlike the existing design codes, the model considers the effect of anchorage and the shear span‐to‐depth ratio at the ultimate state. Artificial NN model is trained, validated and tested using the literature of 79 reinforced concrete beams. Then, NN results are compared with those ‘theoretical’ predictions calculated directly from International Federation for Structural Concrete, the American guideline (ACI 440.2R) and the Australian guideline. Within all theoretical predictions of design guidelines, fib14 provided the best predictions according to experimental results. Consequently, 25% of fib14 predictions are within ±10% of the experimental results, and also, 65% of the fib14 predictions are within ±25% of the measured values. Besides, executed comparisons indicated that the NN model is more exact than the guideline equations with respect to the experimental results and can be applied effectively within the range of parameters covered in this study. Copyright © 2014 John Wiley & Sons, Ltd.

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“…V u = V c + V s + V f ). However, all three components may not reach their peak values (V c , V s , V f ) simultaneously and adverse shear interaction may exist among them during the failure process of the strengthened beam, thus resulting in a shear strength less than the summation of the maximum shear contribution of each component (Ali et al, 2006;Bousselham and Chaallal, 2004, 2006a, b, 2008Chen, 2010;Chen et al, 2012Chen et al, , 2013Chen et al, 2010;Denton et al, 2004;Nanni, 2000, 2002;Li et al, 2001Li et al, , 2002Park et al, 2001;Pellegrino and Modena, 2002Teng et al, 2002;Teng et al, 2004).…”

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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Shear strengthening effect by bonded composite fabrics on RC beams

Cited by 48 publications

References 6 publications

Shear Strength Model for FRP-Strengthened RC Beams with Adverse FRP-Steel Interaction

Shear Strength Model for FRP-Strengthened RC Beams with Adverse FRP-Steel Interaction

An anticipated shear design method for reinforced concrete beams strengthened with anchoraged carbon fiber‐reinforced polymer by using neural network

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

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