Shear Strengthening of Concrete Girders Using Carbon Fiber-Reinforced Polymer Sheets and Anchors

Garcia, Jose E.; Satrom, Christopher N.; Jirsa, James O.; Ghannoum, Wassim M.

doi:10.14359/51702234

Cited by 10 publications

(14 citation statements)

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“…The use of vertical FRP strips with FRP spike anchors at the web-flange transitions was explored in study [4]. For the tested configuration, the spike anchor was found to be ineffective in increasing the ultimate failure load.…”

Section: Embedded Frp (Spike) Anchorsmentioning

confidence: 99%

“…A similar configuration combining horizontal FRP strips and spike anchors, as illustrated in Figure 3, proved to be a better solution. With this configuration an increase of 50% in cracking load and 40% in ultimate load was achieved [4]. a) Schematic representation b) Drilled holes for FRP spike anchors Figure 3: FRP shear strengthening configuration with horizontal FRP sheets and spike anchors [4] Another attempt was made to anchor the CFRP at the web-flange transition by cutting a groove and filling it with continuous FRP laminate with epoxy.…”

Section: Embedded Frp (Spike) Anchorsmentioning

confidence: 99%

“…Performance of FRP strips in comparison to continuous sheets wrapped around the shear span was also investigated [4]. It was found that the shear capacity for both configurations increased around 40%.…”

Section: Effect Of Frp Spacingmentioning

confidence: 99%

“…The main problem, associated with these shear strengthening configurations is the early debonding around the concave web-flange interface. Due to this early debonding, the capacity of the FRP shear reinforcement is not utilized efficiently [2][3][4][5]. One approach to avoid the mentioned debonding is to add concrete filling elements to render rectangular shape to I-girders at the position of FRP strips as presented in a study [6].…”

Section: Introductionmentioning

confidence: 99%

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Advancements in shear strengthening of prestressed concrete I-girders using fiber reinforced polymers

Yaqub

Matthys

Czaderski

2021

IABSE Congress Reports

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<p>A number of attempts were made by different researchers in the last couple of decades to strengthen prestressed concrete (PC) I-girders in shear using externally bonded FRP (fibre reinforced polymer) reinforcement. The unanimous observation reported in the literature is the early debonding of FRP shear reinforcement around the internal angles of the I-section. Because of this undesirable phenomenon, the strength of the FRP is utilized inefficiently. This paper gives an overview of the techniques utilized in the past and their relative performance in order to develop a rational solution to the debonding problem, particularly for I-sections. The anchoring techniques used in the past includes different types of FRP anchors as well as mechanical anchors to protect FRP shear reinforcement from debonding on the I-section. It can be concluded that the definite solution to the debonding problem on I-sections has not been obtained yet. This is because of the complex failure modes of FRP shear reinforcement and PC I-girders.</p>

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Section: Embedded Frp (Spike) Anchorsmentioning

confidence: 99%

Section: Embedded Frp (Spike) Anchorsmentioning

confidence: 99%

Section: Effect Of Frp Spacingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Advancements in shear strengthening of prestressed concrete I-girders using fiber reinforced polymers

Yaqub

Matthys

Czaderski

2021

IABSE Congress Reports

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“…Adhikary and Mutsuyoshi [6] said that the shear strength increased as the depth of carbon fiber sheets and the number of layers increased, and the most efficient rehabilitation between the different wrapping layouts was provided by the vertical U-wrap of the sheet. Likewise, the shear behavior of RC beams strengthened with CFRP was investigated by several studies [1,7,8,9,10], reporting that the CFRP rehabilitation effectiveness on shear resistance was affected by the used shear reinforcement quantity. Taljsten [11] agreed that when CFRP layers are placed perpendicular to the direction of the crack, the RC beams rehabilitation in shear becomes more effective.…”

Section: Introductionmentioning

confidence: 99%

Rehabilitation of Shear damaged Reinforced Concrete Beams with U-Wrapped Carbon Fiber Reinforced Polymer Sheets: Experimental study

Abdulazeez

Abdulridha

2023

DJES

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This paper presented an experimental study of external rehabilitation of damaged Reinforced Concrete (RC) Beams with Carbon Fibre Reinforced Polymer (CFRP) sheets. The primary objective is to study the shear behavior of four simply supported beam specimens with an total length of 1700mm, a width of 150 mm, and a depth of 250 mm was tested under a monotonic two-point load. The variable used in this study was the specimen damage ratio (50%, 60%, and 70%), while the layout of CFRP sheets and shear-span to effective depth ratio (a/d = 2.5) were kept constant. The design of the examined beams was according to ACI 318M-19 to ensure shear failure. From this study, it was concluded that external rehabilitation with U-shape CFRP sheets offered a very adequate and efficient rehabilitation method for damaged RC beams. Each beam's behavior was examined concerning the crack pattern, first crack load, load-deflection and ultimate load. The CFRP rehabilitation has improved the ultimate load capacity of damaged beams by about 10.91% to 15.96% compared with the expected remaining ultimate load capacity of control specimens without rehabilitation, as well as an increment in the deflection of mid-span from -6.81%, 24.11% at an ultimate load.

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Shear strengthening of precast prestressed I‐girders using carbon fiber reinforced polymers and in‐fill concrete blocks

Yaqub

Czaderski

Matthys

2023

Structural Concrete

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Due to the rapid increase in traffic volumes, existing infrastructure demands proper assessment and in some cases rehabilitation is needed. Prestressed concrete (PC) I-shaped girders are widely used in prefabricated girder bridges. With sequel generations of shear design provisions their shear capacity might need to be increased in the framework of assessing safety of aging bridges. Earlier attempts in shear strengthening this specific type of girder with fiber reinforced polymers (FRP) has shown early debonding along the concrete surface at the web-flange corner so that the increase in shear strength was very limited. This study presents the results of full scale PC I-girders strengthened with CFRP through epoxy bonded concrete in-fill blocks that locally transforms the I-section to a rectangular section at the position of CFRP strips. This transformation eliminated the early debonding of CFRP shear reinforcement and for the studied configurations a 30%-40% increase in shear capacity was obtained with respect to the unstrengthened control specimen, without and with additional CFRP spike anchors, respectively. In comparison, similar configurations without in-fill blocks reached 5% and 12% increase in shear capacity, respectively. As such, the use of in-fill blocks appeared more effective than local anchorage of the CFRP at the web-flange corner. Analytical verification of the experimental results confirmed that existing formulations lack ability to predict the shear capacity of strengthened I-girders, and further work is needed in this respect.

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Shear Strengthening of Concrete Girders Using Carbon Fiber-Reinforced Polymer Sheets and Anchors

Cited by 10 publications

References 0 publications

Advancements in shear strengthening of prestressed concrete I-girders using fiber reinforced polymers

Advancements in shear strengthening of prestressed concrete I-girders using fiber reinforced polymers

Rehabilitation of Shear damaged Reinforced Concrete Beams with U-Wrapped Carbon Fiber Reinforced Polymer Sheets: Experimental study

Shear strengthening of precast prestressed I‐girders using carbon fiber reinforced polymers and in‐fill concrete blocks

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