Shear strengthening of RC beams using innovative manually made NSM FRP bars

Jalali, Meysam; Sharbatdar, Mohammad Kazem; Chen, Jian Fei; Alaee, Farshid Jandaghi

doi:10.1016/j.conbuildmat.2012.06.068

Cited by 57 publications

(51 citation statements)

References 24 publications

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“…This can again be explained by the longer embedment length of inclined MMFRP bars, probably delaying the early formation, and propagation of internal new cracks. Even though no visible debonding was observed in these tests, based on results of shear tests reported in previous investigations, the end anchorage of NSM bars had a signi cant e ect on capacity and, particularly, on ductility of shear strengthened beams [14]. Figure 13 shows the shear-strain relationship of MMFRP bars of the strengthened beams.…”

Section: Shear Beamsmentioning

confidence: 99%

“…Moreover, the test results revealed that shearde cient beams might well be strengthened by the externally applied FRP strips [12,13]. Recently, the e ciency of the NSM technique using MMFRP rods for shear strengthening of RC beams was investigated [14], revealing that the MMFRP (Manually-Made FRP) rods e ectively enhanced the shear capacity of tested beams. Moreover, e ciency of the NSM technique was tested on RC columns' exural strengthening and reinforced concrete beams with low concrete strength, showing that the proposed strengthening technique is feasible and e ective for improving the exural capacity and energy dissipation capacities [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Flexural and Shear strengthening of RC beams with NSM technique-manually made CFRP bars

Sharbatdar

Jaberi

2017

Scientia Iranica

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Abstract. In this paper, the e ciency of NSM method for both exural and shear strengthening of RC beams was examined by applying an innovative manually made CFRP bar (MMFRP) as an alternative reinforcement composite material through experimental and numerical investigation. The experimental program consists of three inverted T-section RC exural-dominated beams and three rectangular section RC shear-dominated beams involving parameters of length, anchoring of MMFRP bars, and their inclination to the beams' longitudinal axis. The structural performances of the tested beams and the FiniteElement (FE) modelling approach, including modes of failure, load-de ection response, and ultimate load capacity, were presented and discussed. Test results indicated that using the proposed MMFRP bars signi cantly improved the exural resistance and shear capacity of de cient concrete beams. Furthermore, a reduction in the crack width along with an increase in the quantity and propagation of new cracks was observed in strengthened beams, compared to control beams.

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Section: Shear Beamsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexural and Shear strengthening of RC beams with NSM technique-manually made CFRP bars

Sharbatdar

Jaberi

2017

Scientia Iranica

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“…Based on Equation [5], the ε 1 for ordinary concrete struts was calculated from Equation [6] below. Equation [6] was derived from Equation [5] and developed for CFRP-strengthened concrete struts based on the contribution of the CFRP sheet. The compressive strength of concrete struts declined due to of concrete softening in response to the strut effectiveness factor in STM.…”

Section: Modified Strut Effectiveness Factor For Cfrpstrengthened Deementioning

confidence: 99%

“…The average principal tensile stress for cracked concrete in concrete struts in tension proposed in the above research is presented in Equation [5].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies explored the effects of CFRP in three forms (sheet, plate, and bar) on the behavior of RC beams (4)(5)(6)(7)(8). Besides, many studies have been conducted to investigate the behavior and capacity of reinforced concrete (RC) beams strengthened with CFRP in terms of flexure (9,10) and shear (11)(12)(13)(14)(15)(16)(17)(18)(19).…”

Section: Introductionmentioning

confidence: 99%

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Modification of strut effectiveness factor for reinforced concrete deep beams strengthened with CFRP laminates

Panjehpour¹,

Ali²,

Voo³

et al. 2014

Mater. construcc.

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This paper proposes a method to modify the strut effectiveness factor in the strut-and-tie model for CFRP-strengthened reinforced concrete deep beams. Two groups of deep beams comprising six ordinary reinforced concrete deep beams and six CFRP-strengthened reinforced concrete deep beams were experimentally tested under the four-point bending configuration. The shear span-to-effective depth ratio of the beams in each group was 0.75, 1.00, 1.25, 1.50, 1.75, and 2.00. The theoretical principal tensile strain in CFRP-strengthened struts was modified based on a proposed empirical relationship, based on two ratios: the experimental to the theoretical value of principal tensile strain and the shear span-to-effective depth of deep beams. KEYWORDS: RESUMEN:Modificación del factor de eficacia de las bielas en vigas de canto de hormigón reforzadas con laminados de polímero reforzado con fibras de carbono. En este trabajo se propone un método en el que se modifica el factor de eficacia que se aplica a las bielas en el modelo de bielas y tirantes para vigas de canto de hormigón reforzadas con laminados CFRP (polímero reforzado con fibras de carbono). Mediante el ensayo a cuatro puntos se determina la resistencia a flexotracción de doce vigas de canto divididas en dos grupos de seis, las del primer grupo de hormigón armado normal y las del segundo de hormigón reforzado con laminados de CFRP. En ambos grupos cada una de las seis vigas se caracteriza por una relación luz de cortante-canto útil distinta, con valores utilizados de: 0.75, 1.00, 1.25, 1.50, 1.75, y 2.00. El valor teórico de la deformación principal por tracción de la biela reforzada con CFRP se modifica de acuerdo con la relación empírica propuesta en este trabajo. Esta se establece a partir de otras dos: la relación entre los valores experimental y teórico de la deformación por tracción principal y la relación luz de cortante-canto útil de las vigas de canto.

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Effect of Near-Surface Mounted Adhesive on Shear Damaged Reinforced Concrete Beams

Kennedy

Rteil

2022

8th International Conference on Advanced Composite Materials in Bridges and Structures

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Shear strengthening of RC beams using innovative manually made NSM FRP bars

Cited by 57 publications

References 24 publications

Flexural and Shear strengthening of RC beams with NSM technique-manually made CFRP bars

Flexural and Shear strengthening of RC beams with NSM technique-manually made CFRP bars

Modification of strut effectiveness factor for reinforced concrete deep beams strengthened with CFRP laminates

Effect of Near-Surface Mounted Adhesive on Shear Damaged Reinforced Concrete Beams

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