Debonding in RC Beams Shear Strengthened with Complete FRP Wraps

Cao, Shuangyin; Chen, J. F.; Teng, Jinguang; Zhang, Hao; Chen, J.

doi:10.1061/(asce)1090-0268(2005)9:5(417)

Cited by 143 publications

(59 citation statements)

References 26 publications

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“…By evaluating the development of shear resistance contributed by both external shear-strengthening FRP (based on the solution of Chen et al (2012)) and internal steel shear reinforcements as the critical shear crack widens, Chen et al (2013) In RC beams shear strengthened using EB FRP and failing due to FRP rupture, the adverse shear interaction exists mainly between the external FRP (V f ) and concrete (V c ), which can be qualitatively explained as follows. As debonding of FRP strips on ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T the beam sides generally precedes the eventual FRP rupture failure as experimentally observed by Cao et al (2005) and , it can be reasonably assumed that the average strain developed in the FRP along the critical shear crack is proportional to the maximum shear crack width. Based on this assumption, it can be easily inferred that the average strain in FRP is also affected by the beam size: the larger the beam size the larger the shear crack width at the FRP rupture failure, and thus the larger degradation of concrete shear resistance mechanism (i.e.…”

Section: Introductionmentioning

confidence: 86%

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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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Section: Introductionmentioning

confidence: 86%

“…However, often the failure of RC beams shear strengthened with FRP wraps (Jirawattanasomkul et al, 2013; and in some cases with FRP U-jackets [e.g. FRP U-jackets with anchorage (Chen et al, 2016;Kim et al, 2014;Mofidi et al, 2012)], are due to the rupture of FRP, usually preceded by FRP debonding (Cao et al, 2005;.…”

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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“…Pellegrino y Modena (12) recomendaron un factor de reducción para la relación entre la deformación efectiva y la deformación última, y desarrollaron un modelo siguiendo un acercamiento al modelo de la celosía. Una cantidad importante de trabajos han sido publicados en los últimos años (13)(14)(15)(16)(17)(18)(19)(20)(21), algunos de los cuales han servido de base para guías de cálculo y normativas.…”

Section: Shear Strengthunclassified

“…Pellegrino and Modena (12) recommended a reduction factor for the ratio between the effective and ultimate strain and developed a model based on the truss analogy approach. A significant number of papers have been published on the subject in recent years (13)(14)(15)(16)(17)(18)(19)(20)(21), some of which have served as a basis for engineering guides and codes.…”

Section: Introductionmentioning

confidence: 99%

Refuerzo externo a cortante con láminas de CFRP en elementos de hormigón armado

Alzate¹,

Arteaga²,

Diego³

et al. 2012

Mater. construcc.

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In light of their excellent mechanical properties and other advantages over conventional systems for repairing and rehabilitating structures, fibre-reinforced polymers (FRPs) are commonly used to enhance the shear strength of RC members. Because of the relatively recent application of the technique in civil engineering, however, it is addressed in very few recommendations or guides. While the design guides in place contain a single, well defined and generally accepted procedure for calculating bending moments, they collectively propose a wide variety of numerical models for shear, none of which is universally acknowledged. The present article focuses on the calculation of ultimate shear strength and describes an experimental study in that context conducted on reinforced concrete beams retrofitted with unidirectional carbon fibre reinforced polymer (CFRP) fabric.Keywords: fibre-reinforced polymers (FRP); concrete; shear strengthening; experimental study. RESUMENLa técnica de refuerzo externo a cortante en elementos de HA con polímeros armados con fibra, conocida como EBR-FRP por sus siglas en inglés, se ha ganado un puesto importante en el área de reparación y rehabilitación de estructuras gracias a las excelentes propiedades mecáni-cas de estos materiales, y sus enormes ventajas respecto a otras técnicas. Sin embargo, debido a que su uso es relativamente reciente en la ingeniería civil, existen pocas recomendaciones o guías que consideren esta técnica. Las guías de cálculo existentes muestran un procedimiento bien definido y aceptado con respecto al cálculo a flexión, sin embargo, los modelos de cálculo a cortante resultan ser altamente variados y controvertidos. Este documento muestra el enfoque actual para el cálculo de esfuerzos cortantes y sus limitaciones, así como el proceso de una investigación experimental sobre vigas de hormigón armado reforzadas externamente con tejido unidireccional de CFRP.Palabras clave: polímeros armados con fibras (FRP); hormigón; refuerzo a cortante; estudio experimental.

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“…Strengthening is often the most viable choice since rebuilding it usually more costly and time consuming. Structures can be strengthened with a variety of conventional techniques such as steel plate bonding, ferro-cement and increasing the cross-section but experimental studies [1] have shown that the use of Fibre Reinforced Polymers (FRP) has many advantages over conventional methods. CFRP composites are the most commonly used of the various types of FRP since they offer many benefits including ease of handling, light weight, durability, strength, corrosion resistance and field-workability.…”

Section: Introductionmentioning

confidence: 99%

Shear Strengthening of Short Span Reinforced Concrete Beams with CFRP Sheets

et al. 2012

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This paper presents the results of a series of tests on short span reinforced concrete beams which were strengthened in shear with various arrangements of externally bonded Carbon Fibre Reinforced Polymer (CFRP) sheets. The objective of the tests was to determine the effect of changing the area and location of the CFRP sheet within the shear span. A total of fifteen 150 mm x 300 mm x 1,675 mm concrete beams were tested of which four were un-strengthened control specimens. The remaining eleven beams were strengthened with varying configurations of CFRP sheets. Parameters varied in the tests included the area of CFRP sheet, its anchorage length and the distance of the CFRP sheet from the support. The experimental results revealed that the CFRP is more effective when it is placed close to the supports and even small areas of CFRP can give significant increases in shear strength. The experimental results were compared with the three different existing shear prediction models for estimating shear contribution of CFRP sheets. A simple strut-and-tie model (STM) is presented which gives reasonable predictions of shear strength for the beam specimens, which were strengthened with CFRP over the full depth of the beam. The superposition method of design is replaced in EC2 by the variable angle truss model in which all the shear is assumed to be resisted by the truss mechanism. A simple regression equation is proposed for the calculation of effective stress in FRP to be used in EC2 . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 1 Shear strengthening of short span reinforced concrete beams with CFRP sheets ABSTRACT This paper presents the results of a series of tests on short span reinforced concrete beams which were strengthened in shear with various arrangements of externally bonded Carbon Fibre Reinforced Polymer (CFRP) sheets. The objective of the tests was to determine the effect of changing the area and location of the CFRP sheet within the shear span. A total of fifteen 150 mm x 300 mm x 1,675 mm concrete beams were tested of which four were unstrengthened control specimens. The remaining eleven beams were strengthened with varying configurations of CFRP sheets. Parameters varied in the tests included the area of CFRP sheet, its anchorage length and the distance of the CFRP sheet from the support. The experimental results revealed that the CFRP is more effective when it is placed close to the supports and even small areas of CFRP can give significant increases in shear strength. The experimental results were compared with the three different existing shear prediction models for estimating shear contribution of CFRP sheets. A simple strut-and-tie model (STM) is presented which gives reasonable predictions of shear strength for the beam specimens, which were strengthened with CFRP over the full depth of the...

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Debonding in RC Beams Shear Strengthened with Complete FRP Wraps

Cited by 143 publications

References 26 publications

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

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

Refuerzo externo a cortante con láminas de CFRP en elementos de hormigón armado

Shear Strengthening of Short Span Reinforced Concrete Beams with CFRP Sheets

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