Partial strengthening of R.C square columns using CFRP

Abdel-Hay, Ahmed Shaban

doi:10.1016/j.hbrcj.2014.01.001

Cited by 14 publications

(6 citation statements)

References 9 publications

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“…Limestone powder (LSP) was used as a filler material for the concrete mix as selfcompacting concrete with fineness 315 m 2 /kg that is classified as fine aggregate gradation zone (2). Tables 5 and 6 list the physical and chemical composition of LSP.…”

Section: Limestone Powdermentioning

confidence: 99%

“…Many researchers investigated the concrete mechanical properties that are mixed with steel fiber and explored a different structural member with and without wrapped by FRP family. Abdel-Hay [2], investigated the behavior and strength of reinforced concrete columns strengthened by CFRP. Then, test results showed that the ultimate load of the wrapped column increases due to the confinement.…”

Section: Introductionmentioning

confidence: 99%

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Behavior and Strength of Steel Fiber Reinforced Self-compacting Concrete Columns Wrapped by Carbon Fiber Reinforced Polymers Strips

Abbas

Ali²,

Abdulridha

2021

IJE

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Strength capacity of reinforced concrete columns is very important to resists and transmit the external loadings. For Architects the engineerings requirements to use small cross section of reinforced concrete columns or in case of poor control quality we need to increase the compressive strength of concrete or use a strengthening technique of the structural elements such as column. In the present paper, the behavior and strength of four steel fiber reinforced self-compact concrete columns reinforced by one layer of CFRP that is wrapped around a square of reinforced concrete columns subjected to static loads is investigated. Self-compacting concrete by using limestone powder is adopted and is mixed with different percentages of steel fiber such as 1%, 1.5% and 2%. Different tests are adopted to investigate the mechanical properties of self-compacted concrete mixed with different steel fiber percentages. Test results show that there is an increase in concrete mechanical properties such as compressive strength, splitting tensile strength and modulus of rupture that reflects on the increase in load capacity of column; specimens when wrapped by CFRP. The increment in columns strength capacity is more than 50% as compared with the control column. All the test specimens are modeled using finite element analysis by ANSYS and the numerical results are compared with tested specimens.

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Section: Limestone Powdermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Behavior and Strength of Steel Fiber Reinforced Self-compacting Concrete Columns Wrapped by Carbon Fiber Reinforced Polymers Strips

Abbas

Ali²,

Abdulridha

2021

IJE

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“…According to the research results of previous researchers for partially FRP-confined RC columns, the strength and ductility of partially FRP-confined RC specimens can be significantly increased [ 11 , 12 , 13 ]. Barros and Ferreira [ 11 ] studied the effectiveness of the discrete confinement through concrete cylinders confined by distinct arrangements of strips of CFRP sheet under concentric load up to the failure point.…”

Section: Introductionmentioning

confidence: 99%

“…From the evaluation on the influence of the width of the strip, distance between strips, number of CFRP layers per strip, CFRP stiffness, and concrete strength class, it was found that load carrying capacity and ductility of concrete specimens increase up to 3.27 and 5.02 times, respectively. Abdel-Hay [ 12 ] investigated the overall behavior of ten RC square columns. The main parameters studied in this research were the compressive strength of the upper part, the height of the upper poor concrete part, and the height of CFRP wrapped part of column under eccentric load.…”

Section: Introductionmentioning

confidence: 99%

Structural Behavior of RC Column Confined by FRP Sheet under Uniaxial and Biaxial Load

2021

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Various researches have been performed to find an effective confining method using FRP sheet in order to improve the structural capacity of reinforced concrete column. However, most of these researches were undertaken for the columns subjected to concentric compressive load or fully confined RC columns. To date, it remains hard to find studies on partially FRP-confined RC columns under eccentric load. In this manner, an experimental investigation was carried out to assess the performance of rectangular RC column with different patterns of CFRP-wrap subject to eccentric loads in this paper. The experiment consists of fourteen mid-scale rectangular RC columns of 200 mm × 200 mm × 800 mm, including five controlled columns and nine CFRP-strengthened ones. All CFRP-strengthened columns were reinforced with one layer of vertical CFRP sheet with the main fiber along the axial axis at four sides, then divided into three groups according to confinement purpose, namely unconfined, partially CFRP-confined, and fully CFRP-confined group. Two loading conditions, namely uniaxially and biaxially eccentric loads, are considered as one of the test parameters. From the test of uniaxial eccentric load, partial and full CFRP-wraps provided 19% and 33% increased load-carrying capacity at an eccentricity-to-column thickness ratio (e/h) of 0.125, respectively, compared to controlled columns, and 8% and 11% at e/h = 0.25, respectively. For the partially CFRP-confined columns subjected to biaxial eccentric load with e/h = 0.125 and 0.25, the load-carrying capacities were improved by 19% and 31%, respectively. This means that the partial confinement with CFRP effectively improves the load-carrying capacity at larger biaxial eccentric load. It was found that the load-carrying capacity could be properly predicted by using code equations of ACI 440.2R-17 and Fib Bulletin 14 Guideline for the full CFRP-confined or partially CFRP-confined columns under uniaxial load. For partially CFRP-confined columns under biaxial loading, however, the safety factors using the Fib calculation process were 20% to 31% lower than that of uniaxially loaded columns.

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“…Confining of concrete elements using wrapping FRP sheets is considered as a very efficient technique to enhance both load carrying capacity and structural ductility of RC columns subjected to axial compression load [1][2][3][4][5][6]. Also, the efficiency of the wrapped FRP sheets in terms of structural performance and ease of application has been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Structural performance of axially loaded FRP-confined rectangular concrete columns as affected by cross-section aspect ratio

Farghal

2018

HBRC Journal

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Wrapping of concrete column using Fiber Reinforced Polymer (FRP) sheets can significantly improve their structural behavior. The aspect ratio of the cross section plays an important role on the efficiency of the applied strengthening technique. This research aimed, experimentally and analytically, to study the effect of aspect ratio on the obtained gain in strength and structural ductility. Also, the effect of both type and configuration of FRP wrapping is discussed. The obtained experimental results showed that the value of the aspect ratio has a significant effect on the gain in strength but it has no obvious influence on the obtained ductility. Moreover, based on the experimental results of 16 specimens concerning the load carrying capacity of FRPconfined specimens, a study to address the applicability of the analytical models (Egyptian code EC, American Concrete Institute 'ACI' code) proposed to predict the nominal compressive strength of rectangular columns confined with FRP sheets is presented in this research. Furthermore, this research introduces a modified model to deal with the FRP partial wrapping system. However both the examined models (ACI and EC) haven't introduced any analytical models to predict the strength of RC columns confined partially with FRP wrapping sheets. The model proposed by ACI code showed an underestimation in predicting the nominal compressive strength, however that proposed by EC showed somewhat an acceptable estimation but inaccurate. Also, the modified expression suggested by the author dealing with columns confined with partially wrapped FRP sheets is examined in this research.

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Partial strengthening of R.C square columns using CFRP

Cited by 14 publications

References 9 publications

Behavior and Strength of Steel Fiber Reinforced Self-compacting Concrete Columns Wrapped by Carbon Fiber Reinforced Polymers Strips

Behavior and Strength of Steel Fiber Reinforced Self-compacting Concrete Columns Wrapped by Carbon Fiber Reinforced Polymers Strips

Structural Behavior of RC Column Confined by FRP Sheet under Uniaxial and Biaxial Load

Structural performance of axially loaded FRP-confined rectangular concrete columns as affected by cross-section aspect ratio

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