Analytical modelling of plastic behaviour of uniformly FRP confined concrete members

Rousakis, Theodoros; Karabinis, Athanasios I.; Kiousis, Panos D.; Tepfers, Ralejs

doi:10.1016/j.compositesb.2008.05.001

Cited by 102 publications

(32 citation statements)

References 10 publications

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“…The dilation angle varies depending on the axial stress level and the FRP jacketing stiffness [16,17]. However, previous studies used the dilation angle to vary with the FRP jacketing stiffness and to be a constant value under varied axial load levels in the finite element analysis [18][19][20]. The finite element results of these studies agreed with the experimental results with reasonable accuracy.…”

Section: Introductionsupporting

confidence: 80%

Concrete-Filled-Large Deformable FRP Tubular Columns under Axial Compressive Loading

Abdelkarim

ElGawady

2015

Fibers

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Abstract:The behavior of concrete-filled fiber tubes (CFFT) polymers under axial compressive loading was investigated. Unlike the traditional fiber reinforced polymers (FRP) such as carbon, glass, aramid, etc., the FRP tubes in this study were designed using large rupture strains FRP which are made of recycled materials such as plastic bottles; hence, large rupture strain (LRS) FRP composites are environmentally friendly and can be used in the context of green construction. This study performed finite element (FE) analysis using LS-DYNA software to conduct an extensive parametric study on CFFT. The effects of the FRP confinement ratio, the unconfined concrete compressive strength ( ′ ), column size, and column aspect ratio on the behavior of the CFFT under axial compressive loading were investigated during this study. A comparison between the behavior of the CFFTs with LRS-FRP and those with traditional FRP (carbon and glass) with a high range of confinement ratios was conducted as well. A new hybrid FRP system combined with traditional and LRS-FRP is proposed. Generally, the CFFTs with LRS-FRP showed remarkable behavior under axial loading in strength and ultimate strain. Equations to estimate the concrete dilation parameter and dilation angle of the CFFTs with LRS-FRP tubes and hybrid FRP tubes are suggested.

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Section: Introductionsupporting

confidence: 80%

Concrete-Filled-Large Deformable FRP Tubular Columns under Axial Compressive Loading

Abdelkarim

ElGawady

2015

Fibers

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“…Stresses and strains will be verified through Integral Absolute Error (IAE), which was defined previously [28,29], and relative error or Average Absolute Error (AAE) in which: Rousakis et al [45,46] (f co = 9-170 MPa)…”

Section: Confinement With Frpmentioning

confidence: 99%

“…The prediction capabilities of specific strain models [2,32,33,[38][39][40][41]43,44,46,73] are investigated. Following this assessment, the empirical models of this study are introduced to predict the ultimate strains (ε cu ) with high accuracy.…”

Section: Ultimate Strain Predictionmentioning

confidence: 99%

“…The lower and upper parts of this line indicate conservative and unconservative strain estimations, respectively. The specific models [2,32,33,[38][39][40][41]43,44,46,73] were investigated with regard to the range of database in this study. However, it should be mentioned that those models tend to significantly overestimate the strain capacity, at or over about f co = 100 MPa.…”

Section: Ultimate Strain Predictionmentioning

confidence: 99%

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A Design-Oriented Combined Model (7 MPa to 190 MPa) for FRP-Confined Circular Short Columns

Girgin

2015

Polymers

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This study addresses a design oriented combined model to predict the ultimate strengths and ultimate strains in an extensive range of unconfined strength (7 to 190 MPa) for the axially loaded fiber-reinforced polymer (FRP)-wrapped circular short columns. Modified Hoek-Brown strength criterion, which was previously extended to FRP-confined concrete from 7 to 108 MPa, is revisited and verified. An empirical strength model beyond 108 MPa encompassing ultra-high strength concrete (UHSC) and ultra-high performance concrete (UHPC) data, as well as empirical strain models, are defined to accomplish the design oriented combined model. This article especially focuses on the verification of the proposed strain models. The assessment performances of those models for carbon FRP (CFRP) and glass FRP (GFRP) confinement are compared with specific models in the current literature. Strength and strain predictions for UHSC and UHPC are integrated into the design oriented combined model as well. The assessments on this model agree with the experimental results in high accuracy.

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“…There are many research reports on CF-FRP-T (Wang and Restrepo [1]; Fam and Rizkalla [2]; Teng et al [3]; Karabinis et al [4]; Rousakis et al [5]; Yu. et al [6]; Yu.…”

Section: Introductionmentioning

confidence: 99%

Static Behavior of Axially Compressed Circular Concrete Filled CFRP-Steel Tubular (C-Cf-CFRP-St) Columns With Moderate Slenderness Ratio

Wang¹,

Qu²,

Shao³

et al. 2016

Volume 12 Number 3

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Thirty-two specimens are experimentally tested in this paper to study the static performance of axially compressed circular concrete filled CFRP-steel tubular (C-CF-CFRP-ST) columns. The tested results indicate that, for columns with relative small slenderness ratio, failure is dominated by the strength loss of the materials. However, for columns with relative large slenderness ratio, failure is controlled by instability. The load versus deflection curves at the mid-height of the composite column can be divided into three stages, i.e., elastic, elasto-plastic and softening stage. Analyses of the tested results show that distribution of longitudinal strains in the steel tube over depth on the cross-section is approximately linear, and the steel tube and its outer CFRP material can cooperate both longitudinally and transversely. The longitudinal strain and the transverse strain at a point have opposite signs, and the steel tube under longitudinal tension has no transverse confinement effect on its concrete. The Deformed modes of the columns, the axial load verses deflection curves at the mid-height, the axial load verses axial shortening curves and the stresses in the steel tube are simulated by using finite element method. The calculated results agree well with the experimental results to prove the accuracy of the finite element model. Stresses in the concrete, the steel tube and the CFRPs are analyzed by using finite element method. The numerical results show that the interaction force between the steel tube and the concrete decreases gradually from compressive region to tensile region. The adhesive strength between the concrete and the steel tube has little effect on the critical buckling load and on the elastic stiffness of the columns. Equation for calculating the critical buckling load of the composite columns is presented, and the estimated results agree well with the experimental results.

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Analytical modelling of plastic behaviour of uniformly FRP confined concrete members

Cited by 102 publications

References 10 publications

Concrete-Filled-Large Deformable FRP Tubular Columns under Axial Compressive Loading

Concrete-Filled-Large Deformable FRP Tubular Columns under Axial Compressive Loading

A Design-Oriented Combined Model (7 MPa to 190 MPa) for FRP-Confined Circular Short Columns

Static Behavior of Axially Compressed Circular Concrete Filled CFRP-Steel Tubular (C-Cf-CFRP-St) Columns With Moderate Slenderness Ratio

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