Fiber Reinforced Polymer (FRP) Confined Circular Concrete Columns: An Experimental Overview

Valasaki, Maria; Papakonstantinou, Christos G.

doi:10.3390/buildings13051248

Cited by 6 publications

(2 citation statements)

References 114 publications

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“…The compressive strength of concrete specimens could be enhanced when confined with FRP material, and the axial strain would increase as well [1][2][3][4][5]. In the current practice, carbon-fiber-reinforced polymer (CFRP) was one of the most popular FRP materials for repairing and retrofitting RC structural members [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

A Constitutive Model for Circular and Square Cross-Section Concrete Confined with Aramid FRP Laminates

Li,

Chen,

Syu

et al. 2023

Buildings

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Fiber-reinforced polymer (FRP) has been used for seismic retrofitting and structural reinforcement over recent decades. Numerous researchers have created stress–strain models based on experimental data to predict the mechanical properties of FRP-confined concrete. In this study, circular and square cross-section specimens with different design concrete strength were prepared, and the compressive strength of the specimens confined with different layers of aramid FRP (AFRP) were measured in compressive tests. A constitutive model was proposed to simulate the uniaxial compressive stress–strain relationship of the AFRP-confined concrete, which was derived from the Mohr–Coulomb failure envelope theory, and the corresponding axial strain was determined from the regression analysis. The internal friction angle of the proposed constitutive model was determined for the cylindrical concrete specimens confined with one and two layers of AFRP. The compressive strength of one and two layers of AFRP-confined concrete specimens were used to obtain the parameters of the constitutive model; the absolute average error between experimental and predicted compressive strength was 7.01%. Then, the constitutive model was used to predict the strength of a three-layer AFRP-confined concrete specimen, and the absolute average error was 4.95%. The cross-sectional shape coefficient of the square concrete specimen was obtained analytically. Substituting the cross-sectional shape coefficient into the proposed constitutive model, the average absolute error of the square cross-section concrete specimen was about 3.84%. The results indicated that the proposed constitutive model can predict the compressive strength of circular and square cross-section concrete specimens confined with AFRP.

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Section: Introductionmentioning

confidence: 99%

A Constitutive Model for Circular and Square Cross-Section Concrete Confined with Aramid FRP Laminates

Li,

Chen,

Syu

et al. 2023

Buildings

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show abstract

“…Another possible solution to high-strength concrete confinement is to wrap fiberreinforced polymer (FRP) sheets around the HSC column. Many studies have examined this method for increasing confinement in concrete columns and reducing lateral steel requirements (e.g., [27][28][29][30][31][32][33][34][35][36]). Yet, when considering performance under fire events, external FRP wrapping leads to low fire resistance, requiring additional insulation to protect the column [37,38].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Analytical Study on the Axial Behavior of Circular High-Strength Concrete Columns with Hybrid Carbon Fibers and Steel Confinement System

Shachar,

Eid,

Dancygier

2023

Buildings

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This paper describes a work that examines a new solution to the problem that arises from the relatively high amount of transverse reinforcement required in HSC columns. It presents an alternative to common transverse steel reinforcement, a dual system comprising steel ties and a carbon-fiber mesh (CFM) applied internally together with steel ties. The behavior of the proposed system was examined in this work in a series of twelve laboratory tests of circular stub column specimens. The experiments performed in this work focused on the columns’ load and displacement capacities. The tests were planned with the aid of an analytical model that was originally developed for a hybrid system of external fiber-reinforced polymer (FRP) sheets and internal steel, and was adapted for the current system. An analysis of the results shows that for a given amount of conventional transverse steel, the application of the carbon-fiber meshes adds efficiency to the rebar confinement system, in terms of both the load bearing capacity and the ductility, and for specimens with the hybrid confinement system, the higher the carbon fiber amount the larger the ductility improvement. Furthermore, fair to good agreement was observed between the model and the measured stress–strain curves, especially those of the peak stresses. Based on the above findings and the added benefit of fire resistance, the hybrid method appears to be promising for confining HSC columns.

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Prediction of compressive strength of FRP-confined concrete using machine learning: A novel synthetic data driven framework

Zeng,

Wang,

Hua

et al. 2024

Journal of Building Engineering

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Fiber Reinforced Polymer (FRP) Confined Circular Concrete Columns: An Experimental Overview

Cited by 6 publications

References 114 publications

A Constitutive Model for Circular and Square Cross-Section Concrete Confined with Aramid FRP Laminates

A Constitutive Model for Circular and Square Cross-Section Concrete Confined with Aramid FRP Laminates

Experimental and Analytical Study on the Axial Behavior of Circular High-Strength Concrete Columns with Hybrid Carbon Fibers and Steel Confinement System

Prediction of compressive strength of FRP-confined concrete using machine learning: A novel synthetic data driven framework

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