Normalized Confinement Stiffness Approach for Modeling FRP-Confined Concrete

Yazici, Veysel; Hadi, Muhammad N.S.

doi:10.1061/(asce)cc.1943-5614.0000283

Cited by 30 publications

(40 citation statements)

References 20 publications

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“…Comparison of the model performances shown in Figs. [9][10][11] indicates that the proposed model performs significantly better than the existing models in predicting the ultimate conditions of FRP-confined HSC.…”

Section: A New Model For Frp-confined Square and Rectangular Columnsmentioning

confidence: 93%

“…A recent comprehensive review study [1] revealed that over 200 experimental studies have been conducted over the last two decades on the compressive behavior of FRP-confined concrete, resulting in the development of over 80 axial stress-strain models (e.g. [2][3][4][5][6][7][8][9][10]). However, the majority of these studies focused on FRPwrapped specimens and studies examining the behavior of CFFTs remain limited [11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

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Behavior of square and rectangular ultra high-strength concrete-filled FRP tubes under axial compression

Ozbakkaloglu

2013

Composites Part B: Engineering

141

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Section: A New Model For Frp-confined Square and Rectangular Columnsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Behavior of square and rectangular ultra high-strength concrete-filled FRP tubes under axial compression

Ozbakkaloglu

2013

Composites Part B: Engineering

141

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“…A recent comprehensive review study (Ozbakkaloglu et al [1]) revealed that over 200 experimental studies have been conducted over the last two decades on the compressive behavior of FRP-confined concrete resulting in the developments of over 80 axial stress-strain models (e.g. [2][3][4][5][6][7][8][9][10]). However, the majority of these studies focused on FRP-confined specimens manufactured with FRP-wrapped jackets, and studies examining the behavior of FRP tube-encased concrete remain limited.…”

Section: Introductionmentioning

confidence: 99%

Influence of concrete strength and confinement method on axial compressive behavior of FRP confined high- and ultra high-strength concrete

Vincent

Ozbakkaloglu

2013

Composites Part B: Engineering

244

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Elsevier's AAM Policy: Authors retain the right to use the accepted author manuscript for personal use, internal institutional use and for permitted scholarly posting provided that these are not for purposes of commercial use or systematic distribution.Elsevier believes that individual authors should be able to distribute their AAMs for their personal voluntary needs and interests, e.g. posting to their websites or their institution's repository, e-mailing to colleagues. However, our policies differ regarding the systematic aggregation or distribution of AAMs to ensure the sustainability of the journals to which AAMs are submitted. Therefore, deposit in, or posting to, subjectoriented or centralized repositories (such as PubMed Central), or institutional repositories with systematic posting mandates is permitted only under specific agreements between Elsevier and the repository, agency or institution, and only consistent with ABSTRACTThis paper presents an experimental investigation on the effect of concrete compressive strength and confinement method on confined high and ultra high-strength concrete (HSC and UHSC) specimens. A total of 55 fiber reinforced polymer (FRP) confined concrete specimens were tested under monotonic axial compression. All specimens were cylinders with 152 mm diameter and 305 mm height and confined by carbon FRP (CFRP). Three different concrete mixes were examined, with average compressive strengths of 35, 65 and 100 MPa. The effect of the confinement method was also examined with FRP-wrapped specimens compared to FRP tube-encased specimens. Axial and lateral behavior was recorded to observe the axial stress-strain relationship and lateral strain behavior for concentric compression. Ultimate axial and lateral conditions are tabulated and the complete stressstrain curves have been provided. The experimental results presented in this paper provide a performance comparison between FRP-confined conventional normal-strength concrete (NSC) and the lesser understood area of FRP-confined HSC and UHSC. The results of this experimental study clearly indicate that above a certain confinement threshold, FRP-confined HSC and UHSC exhibits highly ductile behavior, however for the same normalized confinement pressures, axial performance of FRPconfined concrete reduces as concrete strength increases. The results also indicate that ultimate conditions of FRP-wrapped specimens are similar to those confined by FRP tubes, however a 2 performance difference is evident at the transition region. The performance of 10 existing stress-strain models were assessed against the experimental datasets and the performance of these models discussed.The results of this model assessment revealed the need for further development for stress-strain models developed specifically for FRP-confined HSC or UHSC.

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“…8). The models of ACI 440.2R-08 (ACI 2008), Teng et al (2009), andTepfers (2003) show that the precision of these models are not good, whereas the model of Yazici and Hadi (2012) exhibits good predictions in this case. For further verification, Fig.…”

Section: Circular Frp-confined Concrete Columnsmentioning

confidence: 91%

“…5) to assess the performance of existing models and the proposed model. Seven existing models were considered in this verification [Karbhari and Gao 1997;Toutanji 1999;De Lorenzis and Tepfers 2003;ACI 440.2R-08 (ACI 2008);Teng et al 2009;Yazici and Hadi 2012]. Because of the limited space in the writers' paper, only four models that have comparable performance are shown (Fig.…”

Section: Circular Frp-confined Concrete Columnsmentioning

confidence: 99%

Strain Estimation of CFRP-Confined Concrete Columns Using Energy Approach

Pham

Hadi

2013

J. Compos. Constr.

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A new model is presented for calculating the axial strain of carbon fiber-reinforced polymer (CFRP)-confined concrete columns. An energy-balance approach is introduced to establish a relationship of the energy absorption between a confined concrete column and CFRP. The proposed model was verified using a large database collected from 167 CFRP-confined plain concrete specimens. This database contains 98 circular specimens with diameters ranging between 100 and 152 mm, and 69 square specimens having a side length ranging between 100 and 152 mm. The database covers unconfined concrete strengths from 20 to 50 MPa. The proposed model shows very good correlation with the experimental results. In addition, the proposed model also provides a comparative prediction of the strain of CFRP-confined concrete columns in two extreme cases, i.e., (1) insufficient confinement, and (2) heavy confinement, which are not usually well predicted by other models. Abstract: A new model is presented for calculating the axial strain of carbon fiber-reinforced polymer (CFRP)-confined concrete columns. An energy-balance approach is introduced to establish a relationship of the energy absorption between a confined concrete column and CFRP. The proposed model was verified using a large database collected from 167 CFRP-confined plain concrete specimens. This database contains 98 circular specimens with diameters ranging between 100 and 152 mm, and 69 square specimens having a side length ranging between 100 and 152 mm. The database covers unconfined concrete strengths from 20 to 50 MPa. The proposed model shows very good correlation with the experimental results. In addition, the proposed model also provides a comparative prediction of the strain of CFRP-confined concrete columns in two extreme cases, i.e., (1) insufficient confinement, and (2) heavy confinement, which are not usually well predicted by other models.

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Normalized Confinement Stiffness Approach for Modeling FRP-Confined Concrete

Cited by 30 publications

References 20 publications

Behavior of square and rectangular ultra high-strength concrete-filled FRP tubes under axial compression

Behavior of square and rectangular ultra high-strength concrete-filled FRP tubes under axial compression

Influence of concrete strength and confinement method on axial compressive behavior of FRP confined high- and ultra high-strength concrete

Strain Estimation of CFRP-Confined Concrete Columns Using Energy Approach

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