Finite Element Modeling of Carbon Fiber-Reinforced Polymer Reinforced Concrete Beams under Elevated Temperatures

Muhammad Masood Rafi, Ali Nadjai, Faris Ali

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The paper presents details of a three-dimensional finite element (FE) model for the prediction of response of reinforced concrete (RC) beams under an elevated temperature regime. The beams were reinforced with either steel or fiber-reinforced polymer (FRP) bars. Crack formation and propagation were modeled with the help of smeared cracks. Changes in the material properties of both concrete and reinforcing bars at high temperatures have been considered. Constitutive models for the temperature-dependent material properties of carbon FRP (CFRP) bars and thermal expansion coefficients for both concrete and steel have been proposed. The effects of tension softening and stiffening have been included in the model. Excellent convergence and numerical stability of the formulation was found. The models showed good agreement with the recorded data of temperature and beam strength and stiffness. Analytical concrete stress distribution is compared in steel and FRP reinforced beams and differences are discussed.
LanguageEnglish
Pages701-710
JournalStructural Journal
Volume105
Issue number6
Publication statusPublished - Nov 2008

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Carbon fibers
Reinforced concrete
Concretes
Polymers
Steel
Materials properties
Temperature
Fibers
Convergence of numerical methods
Constitutive models
Crack initiation
Thermal expansion
Stress concentration
Crack propagation
Stiffness
Cracks

Cite this

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abstract = "The paper presents details of a three-dimensional finite element (FE) model for the prediction of response of reinforced concrete (RC) beams under an elevated temperature regime. The beams were reinforced with either steel or fiber-reinforced polymer (FRP) bars. Crack formation and propagation were modeled with the help of smeared cracks. Changes in the material properties of both concrete and reinforcing bars at high temperatures have been considered. Constitutive models for the temperature-dependent material properties of carbon FRP (CFRP) bars and thermal expansion coefficients for both concrete and steel have been proposed. The effects of tension softening and stiffening have been included in the model. Excellent convergence and numerical stability of the formulation was found. The models showed good agreement with the recorded data of temperature and beam strength and stiffness. Analytical concrete stress distribution is compared in steel and FRP reinforced beams and differences are discussed.",
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Finite Element Modeling of Carbon Fiber-Reinforced Polymer Reinforced Concrete Beams under Elevated Temperatures. / Rafi, Muhammad Masood; Nadjai, Ali; Ali, Faris.

Vol. 105, No. 6, 11.2008, p. 701-710.

Research output: Contribution to journalArticle

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AU - Nadjai, Ali

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N2 - The paper presents details of a three-dimensional finite element (FE) model for the prediction of response of reinforced concrete (RC) beams under an elevated temperature regime. The beams were reinforced with either steel or fiber-reinforced polymer (FRP) bars. Crack formation and propagation were modeled with the help of smeared cracks. Changes in the material properties of both concrete and reinforcing bars at high temperatures have been considered. Constitutive models for the temperature-dependent material properties of carbon FRP (CFRP) bars and thermal expansion coefficients for both concrete and steel have been proposed. The effects of tension softening and stiffening have been included in the model. Excellent convergence and numerical stability of the formulation was found. The models showed good agreement with the recorded data of temperature and beam strength and stiffness. Analytical concrete stress distribution is compared in steel and FRP reinforced beams and differences are discussed.

AB - The paper presents details of a three-dimensional finite element (FE) model for the prediction of response of reinforced concrete (RC) beams under an elevated temperature regime. The beams were reinforced with either steel or fiber-reinforced polymer (FRP) bars. Crack formation and propagation were modeled with the help of smeared cracks. Changes in the material properties of both concrete and reinforcing bars at high temperatures have been considered. Constitutive models for the temperature-dependent material properties of carbon FRP (CFRP) bars and thermal expansion coefficients for both concrete and steel have been proposed. The effects of tension softening and stiffening have been included in the model. Excellent convergence and numerical stability of the formulation was found. The models showed good agreement with the recorded data of temperature and beam strength and stiffness. Analytical concrete stress distribution is compared in steel and FRP reinforced beams and differences are discussed.

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