Shear strengthening of concrete members with TRM jackets: Effect of shear span-to-depth ratio, material and amount of external reinforcement

Tetta, Zoi; Koutas, Lampros N.; Bournas, Dionysios A.

doi:10.1016/j.compositesb.2017.10.041

Cited by 76 publications

(32 citation statements)

References 53 publications

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“…Based on the results presented in Awani et al (2016), in which all the strengthened beams failed due to diagonal shear, the contribution of the TRM jacket to the total shear resistance is not practically affected by the amount of stirrups. • Recently, Tetta et al (2018a) investigated the effect of shear span-to-depth ratio in RC beams strengthened in shear with U-shaped TRM jackets; they concluded that the shear spanto-depth ratio has no effect on the failure mode nor on the contribution of the jacket to the total shear resistance of the beams. • Regarding the geometry of the textile materials used in TRM, Tetta et al ( , 2018a concluded that different (dry/ uncoated) carbon fiber textile geometries having the same reinforcement ratio resulted in different load increases and failure modes.…”

Section: Effect Of Parameters On the Effectiveness Of Shear Strengthementioning

confidence: 99%

“…• Recently, Tetta et al (2018a) investigated the effect of shear span-to-depth ratio in RC beams strengthened in shear with U-shaped TRM jackets; they concluded that the shear spanto-depth ratio has no effect on the failure mode nor on the contribution of the jacket to the total shear resistance of the beams. • Regarding the geometry of the textile materials used in TRM, Tetta et al ( , 2018a concluded that different (dry/ uncoated) carbon fiber textile geometries having the same reinforcement ratio resulted in different load increases and failure modes. This effect of the geometry of the textile fiber material is drastically mitigated by increasing the reinforcement ratio.…”

Section: Effect Of Parameters On the Effectiveness Of Shear Strengthementioning

confidence: 99%

“…;Al-Salloum et al 2012;Jung et al 2015;Loreto et al 2015;Tetta et al 2015;Awani et al 2016;Tzoura and Triantafillou 2016;Tetta et al 2018a); (2) increasing the ratio of width over spacing (w f ∶s f ) of discontinuous TRM strips(Contamine et al 2013;Ombres 2015b); and (3) applying textile materials of different weights(Azam and Soudki 2014;Tzoura and Triantafillou 2016;Tetta et al 2018a…”

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confidence: 99%

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Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

et al. 2019

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Textile reinforced mortars (TRM), also known in the international literature as textile reinforced concrete (TRC) or fabric reinforced cementitious matrix (FRCM) materials, have been widely studied during the last two decades as they constitute a promising alternative to the fiber reinforced polymer (FRP) retrofitting solution for strengthening of reinforced concrete members. This paper presents a state-of-the-art review on the strengthening of concrete structures with TRM. First, the tensile and bond behavior of TRM is described. Next, an overview of studies on the use of TRM for flexural, shear, confinement, and seismic retrofitting of concrete or RC members is included, and the key parameters are investigated.

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Section: Effect Of Parameters On the Effectiveness Of Shear Strengthementioning

confidence: 99%

Section: Effect Of Parameters On the Effectiveness Of Shear Strengthementioning

confidence: 99%

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confidence: 99%

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Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

et al. 2019

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“…4b, d for TRM and FRP specimens, respectively. More details on these test set-ups are given by [37]. The mean values of ultimate tensile stress (f fu ), ultimate tensile strain (e fu ) and the modulus of elasticity of (E f ) for both TRM and FRP coupons are presented in Table 2 (the standard deviation is also given in parentheses).…”

Section: Ancillary Tensile Tests On Trm and Frp Couponsmentioning

confidence: 99%

Concrete confinement with TRM versus FRP jackets at elevated temperatures

et al. 2020

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Despite the clear cost, ease of installation, and construction schedule advantages of confinement of concrete structural elements with fibre-reinforced polymers (FRPs) for strength and deformability enhancement, concerns as to their performance at elevated temperature, or in fire, remain. The results of a series of elevated temperature experiments on FRP and textile reinforced mortar (TRM) strengthening systems for confinement of circular concrete columns are presented. The behaviour and effectiveness of the respective confining systems is studied up to temperatures of 400 °C. A total of 24 concrete cylinders were wrapped in the hoop direction with different amounts of FRP or TRM, heated to steady-state temperatures between 20 and 400 °C, and loaded to failure in concentric axial compression under a steady-state thermal regime. The results indicate that the effectiveness of the FRP confining system bonded with epoxy decreased considerably, but did not vanish, with increasing temperatures, in particular within the region of the glass transition temperature of the epoxy resin/adhesive. Conversely, the TRM confining system, bonded with inorganic mortar rather than epoxy, demonstrated superior performance than the FRP confining system at 400 °C as compared against tests performed at ambient temperature.

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“…In the existing literature, there are several existing experimental programs on shear strengthened beams [7,8,[13][14][15][16], and in particular with T-beams strengthened with U-shaped or wrapped configurations, with or without transverse reinforcement [17][18][19][20][21][22]. Recently, shear tests have been performed with textile reinforced mortar as shear external reinforcement [23][24][25]. Despite results are analysed in detail in all of them, the contributions of each component to the shear strength are not clearly identified.…”

Section: Introductionmentioning

confidence: 99%

Contribution of externally bonded FRP shear reinforcement to the shear strength of RC beams

Oller

Pujol

Bernat

2019

Composites Part B: Engineering

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An experimental program of T-beams strengthened in shear by CFRP sheets has been developed with two longitudinal reinforcement ratios and different externally bonded CFRP shear strengthening amounts in a discontinuous or continuous U-shaped configuration with and without mechanical anchorages. The effectiveness of the external reinforcement without anchorages was low regardless the CFRP reinforcement ratio. There is an evidence of the interaction of the different shear strength components, concrete V c , transverse steel V s , CFRP sheets V f that have been obtained from the registered data of the instrumentation. This interaction might explain that the ultimate shear force of some CFRPstrengthened beams was lower than the one of the control beam. There is a significant difference between the sum of the V c , V s ,and V f components and the total shear force. This difference is assumed to be carried out by the flange (including its internal transverse reinforcement), which represents a significant percentage of the total shear strength (with a mean value of 38%). Finally, the contribution of the CFRP has been obtained by different existing guidelines and has been compared to the experimental values.

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Shear strengthening of concrete members with TRM jackets: Effect of shear span-to-depth ratio, material and amount of external reinforcement

Cited by 76 publications

References 53 publications

Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

Strengthening of Concrete Structures with Textile Reinforced Mortars: State-of-the-Art Review

Concrete confinement with TRM versus FRP jackets at elevated temperatures

Contribution of externally bonded FRP shear reinforcement to the shear strength of RC beams

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