Generalized Analysis-oriented model of FRP confined concrete circular columns

Shayanfar, Javad; Barros, Joaquim A. O.; Rezazadeh, Mohammadali

doi:10.1016/j.compstruct.2021.114026

Cited by 31 publications

(12 citation statements)

References 43 publications

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“…The average level of confinement pressure uniformly acting along the column height (f l ) can be defined as f l ¼ k v f l,i , in the compliance with the concept of confinement efficiency factor. 23,24 Accordingly, based on the equilibrium of confinement forces, Shayanfar et al 22 determined k v as:…”

Section: Concept Of Confinement Efficiency Factormentioning

confidence: 99%

“…As shown, owing to vertical arching action, the strip region was assumed to be subjected to the highest confinement pressure (

f_{normall, normali}

), whereas the concrete at the mid‐height of two consecutive strips is subjected to lowest confinement pressure (

f_{normall, normalj}

). The average level of confinement pressure uniformly acting along the column height ( f l ) can be defined as

f_{l} = k_{v} f_{normall, normali}

, in the compliance with the concept of confinement efficiency factor 23,24 …”

Section: Proposed Modelmentioning

confidence: 99%

See 1 more Smart Citation

Cross‐sectional and confining system unification on peak compressive strength of FRP confined concrete

Shayanfar

Barros

Rezazadeh

2022

Structural Concrete

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Despite the many axial confinement models already proposed for the determination of the peak compressive strength of fiber-reinforced polymer (FRP) confined concrete columns, they are, in general, applicable only to concrete columns of circular or square cross-section, with full or partial confinement arrangements. In this study, by proposing a cross-sectional and confining system unification approach, a new model is developed and calibrated based on a large test database.For the generalization of the cross-section and FRP-based confinement arrangement, the concept of confinement efficiency factor with a unified mathematical framework is adopted. By simulating experimental tests and comparing to the predictions of existing confinement models, the developed one demonstrates a very high reliability and suitable for design purposes by balancing the simplicity of the usage and accuracy.

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Section: Concept Of Confinement Efficiency Factormentioning

confidence: 99%

“…As shown, owing to vertical arching action, the strip region was assumed to be subjected to the highest confinement pressure (

f_{normall, normali}

), whereas the concrete at the mid‐height of two consecutive strips is subjected to lowest confinement pressure (

f_{normall, normalj}

). The average level of confinement pressure uniformly acting along the column height ( f l ) can be defined as

f_{l} = k_{v} f_{normall, normali}

, in the compliance with the concept of confinement efficiency factor 23,24 …”

Section: Proposed Modelmentioning

confidence: 99%

Cross‐sectional and confining system unification on peak compressive strength of FRP confined concrete

Shayanfar

Barros

Rezazadeh

2022

Structural Concrete

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“…In order to predict the stress-strain response of FRP confined concrete under ambient temperatures, many models have been proposed, generally categorized in two groups: analysis-oriented models, AOM, ( [13,14,15,16]) and design-oriented models, DOM, ( [17][18][19][20][21]). The AOM determines the axial stress at a given level of axial strain, based on the relationship between FRP confinement pressure and axial strain obtained from a dilation model, through an incremental/iterative calculation procedure, which might not be proper for direct use in design practice.…”

Section: Introductionmentioning

confidence: 99%

Analytical model to predict axial stress-strain behavior of heat-damaged unreinforced concrete columns wrapped by FRP jacket

Shayanfar

Barros

Rezazadeh

2023

Engineering Structures

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“…Although to a lesser extent, tests have also been performed on non-circular section specimens, where confinement is less efficient (4)(5)(6)(7)(8). The lower efficiency for rectangular cross-section is due to the confining action seem to be focused mainly at the corners rather than around the entire perimeter, meaning the confining stress field is non-uniform (9)(10)(11)(12)(13)(14).…”

Section: Introductionmentioning

confidence: 99%

“…The analysis-oriented models predict the stress-strain behavior of FRP-confined concrete, generally, through an iterative process. Among others, the proposal for circular columns made by Spoelstra and Monti (10), certain approaches for square columns (11) or the generalized model for FRP full and partial confinement arrangements (12) are particularly noteworthy. While the analysis models are usually more accurate, their application tends to be laborious.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and design strength models adopted by international guides for FRP-confined concrete columns subjected to axial compression

et al. 2021

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Carbon fiber jacketing is an efficient technique for increasing the strength and strain capacity of concrete circular and square section columns subjected to axial load, although confinement efficiency decreases for rectangular cross-section members. The research project BIA 2016-80310-P includes an experimental program on intermediate-size plain concrete specimens strengthened with carbon fiber jackets, mostly with square and rectangular cross-sections. The results, alongside others with similar characteristics from two databases published, are compared to predictions of four international guides. The incidence of the key parameters in the experimental results is analyzed, such as the aspect ratio of the section, the effective strain in FRP jacket attained at failure or the rounded corner radius. As a result, two efficiency strain factors are proposed, one for circular and another for rectangular specimens. The predictions contained in certain guides, based on a simple linear design-model, are improved by using the proposed efficiency strain factor for rectangular sections.

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Generalized Analysis-oriented model of FRP confined concrete circular columns

Cited by 31 publications

References 43 publications

Cross‐sectional and confining system unification on peak compressive strength of FRP confined concrete

Cross‐sectional and confining system unification on peak compressive strength of FRP confined concrete

Analytical model to predict axial stress-strain behavior of heat-damaged unreinforced concrete columns wrapped by FRP jacket

Experimental analysis and design strength models adopted by international guides for FRP-confined concrete columns subjected to axial compression

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