Session

Architecture

Description

In this paper, reference is made to the key features of ACI, EC2 and other models, regarding SLS calculations of FRP reinforcement concrete and the comparison with steel reinforcement concrete formulas, especially focusing on deflection. Mechanical characteristics of FRP materials, such as lower elastic modulus, lower ratio between Young’s modulus and the tensile strength, lower bond strength of FRP bars and concrete, compared to steel reinforcement, make that SLS results determine the design of FRP reinforced concrete, based on the serviceability requirements. Different parameters influences affect the stresses in materials, maximum crack width and the allowed deflections. In this study we have calculated only the deflections of FRP-RC beams. Concrete beams reinforced with glass-fiber (GFRP) bars, exhibit large deflections compared to steel reinforced concrete beams, because of low GFRP bars elasticity modulus. For this purpose we have used equations to estimate the effective moment of inertia of FRP-reinforced concrete beams, based on the genetic algorithm, known as the Branson’s equation. The proposed equations are compared with different code provisions and previous models for predicting the deflection of FRP-reinforced concrete beams. In the last two decades, a number of researchers adjusted the Branson’s equation to experimental equations of FRP-RC members. The values calculated were also compared with different test results. Also it is elaborated a numerical example to check the deflection of a FRP-RC beam based on various methods of calculation of effective moment of inertia and it is made a comparison of results.

Keywords:

SLS design, FRP bars, reinforced concrete beams, serviceability, deflection, effective moment of inertia, modulus of elasticity, tension stiffening

Session Chair

Carolina Jaeger-Klein

Session Co-Chair

Mimoza Sylejmani

Proceedings Editor

Edmond Hajrizi

ISBN

978-9951-437-33-2

First Page

23

Last Page

33

Location

Durres, Albania

Start Date

7-11-2014 5:00 PM

End Date

7-11-2014 5:15 PM

Included in

Architecture Commons

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Nov 7th, 5:00 PM Nov 7th, 5:15 PM

SLS design of FRP reinforced concrete beams based on different calculation of effective moment of inertia

Durres, Albania

In this paper, reference is made to the key features of ACI, EC2 and other models, regarding SLS calculations of FRP reinforcement concrete and the comparison with steel reinforcement concrete formulas, especially focusing on deflection. Mechanical characteristics of FRP materials, such as lower elastic modulus, lower ratio between Young’s modulus and the tensile strength, lower bond strength of FRP bars and concrete, compared to steel reinforcement, make that SLS results determine the design of FRP reinforced concrete, based on the serviceability requirements. Different parameters influences affect the stresses in materials, maximum crack width and the allowed deflections. In this study we have calculated only the deflections of FRP-RC beams. Concrete beams reinforced with glass-fiber (GFRP) bars, exhibit large deflections compared to steel reinforced concrete beams, because of low GFRP bars elasticity modulus. For this purpose we have used equations to estimate the effective moment of inertia of FRP-reinforced concrete beams, based on the genetic algorithm, known as the Branson’s equation. The proposed equations are compared with different code provisions and previous models for predicting the deflection of FRP-reinforced concrete beams. In the last two decades, a number of researchers adjusted the Branson’s equation to experimental equations of FRP-RC members. The values calculated were also compared with different test results. Also it is elaborated a numerical example to check the deflection of a FRP-RC beam based on various methods of calculation of effective moment of inertia and it is made a comparison of results.