Behavior of FRP Bars-Reinforced Concrete Slabs under Temperature and Sustained Load Effects

Bellakehal, Hizia; Zaidi, Ali; Masmoudi, Radhouane; Bouhicha, M.

doi:10.3390/polym6030873

Cited by 24 publications

(18 citation statements)

References 5 publications

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“…As mentioned in the literature, a reduction in strength and bond properties starts when the temperatures become close to the glass transition temperature, Tg, are reached [19]. The magnitude of Tg depends on the type of resin and ranges between 70 • C and 175 • C [20], however for some of the resins, glass transition temperature can be more than 500 • C. However, the decisive factors of the strength deterioration are also fiber type, manufacturing process and the quality of FRP bars and, above all, the temperature attained in FRP [21].…”

Section: Introductionmentioning

confidence: 94%

Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Protchenko

Szmigiera

2020

Materials

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One of the main concerns of experimental and numerical investigations regarding the behavior of fiber-reinforced polymer reinforced concrete (FRP-RC) members is their fire resistance to elevated temperatures and structural performance at and after fire exposure. However, the data currently available on the behavior of fiber-reinforced polymer (FRP) reinforced members related to elevated temperatures are scarce, specifically relating to the strength capacity of beams after being subjected to elevated temperatures. This paper investigates the residual strength capacity of beams strengthened internally with various (FRP) reinforcement types after being subjected to high temperatures, reflecting the conditions of a fire. The testing was made for concrete beams reinforced with three different types of FRP bars: (i) basalt-FRP (BFRP), (ii) hybrid FRP with carbon and basalt fibers (HFRP) and (iii) nano-hybrid FRP (nHFRP), with modification of the epoxy matrix of the rebar. Tested beams were first loaded at 50% of their ultimate strength capacity, then unloaded before being heated in a furnace and allowed to cool, and finally reloaded flexurally until failure. The results show an atypical behavior observed for HFRP bars and nHFRP bars reinforced beams, where after a certain temperature threshold the deflection began to decrease. The authors suggest that this phenomenon is connected with the thermal expansion coefficient of the carbon fibers present in HFRP and nHFRP bars and therefore creep can appear in those fibers, which causes an effect of “prestressing” of the beams.

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Section: Introductionmentioning

confidence: 94%

Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Protchenko

Szmigiera

2020

Materials

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“…The mechanical properties of concrete and GFRP bars are those determined experimentally by Bellakehal et al (2013 and2014). The mechanical properties of concrete are presented in Table 2.…”

Section: A Finite Element Modelmentioning

confidence: 99%

Numerical simulation of transverse thermal expansion of FRP bars embedded in concrete slabs

ZAIDI¹,

BELLAKEHAL²,

MASMOUDI³

et al. 2018

Sixth International Conference on Advances in Civil Structural and Mechanical Engineering CSM 2018

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The thermal behavior is one of the main drawbacks of fiber reinforced polymer (FRP) bars embedded in concrete due to the significant difference between the transverse coefficient of thermal expansion of FRP bars and that of concrete. This difference generates a radial pressure at the FRP bar/concrete interface under high temperatures, and may cause splitting cracks within concrete. This paper presents a numerical study using ADINA finite elements software to predict transverse thermal strains in glass FRP (GFRP) bars and concrete cover of GFRP bars-reinforced concrete slabs submitted to a temperature increase varied from-50 to +60°C and having a ratio of concrete cover thickness to FRP bar diameter varied from 1.3 to 2.8. The transverse thermal strains, at FRP bar/concrete interface and at external surface of concrete cover, obtained from the numerical model are compared with those obtained from the analytical model and experimental tests.

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“…The importance of this property is given by the fact that FRPs have a thermal expansion that can be up to an order higher than those of the conventional civil material [12].…”

Section: Low Thermal Conductivitymentioning

confidence: 99%

Thermal and Fire Characteristics of FRP Composites for Architectural Applications

Berardi

Dembsey

2015

Polymers

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This paper discusses the main challenges of using fiber reinforced polymers (FRPs) in architectural applications. Architects are showing increased interest in the use of FRPs in modern buildings thanks to FRPs' ability to allow cost effective realization of unique shapes and flexible aesthetics, while accommodating architectural designs and needs. The long-term durability, weathering resistance, and the exceptional mechanical properties have recently suggested the adoption of FRPs for building façade systems in an increasing number of buildings worldwide. However, some challenges for a wider adoption of FRPs in buildings are represented by the environmental and thermal aspects of their production, as well as their resistance to the expected "fire loads". This last aspect often raises many concerns, which often require expensive fire tests. In this paper, the results of cone calorimeter tests are compared with software simulations to evaluate the possibility of designing FRPs on the computer as opposed to current design practice that involves iterative use of fire testing. The comparison shows that pyrolysis simulations related to FRPs are still not an effective way to design fire safe FRPs for architectural applications.

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Behavior of FRP Bars-Reinforced Concrete Slabs under Temperature and Sustained Load Effects

Cited by 24 publications

References 5 publications

Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Post-Fire Characteristics of Concrete Beams Reinforced with Hybrid FRP Bars

Numerical simulation of transverse thermal expansion of FRP bars embedded in concrete slabs

Thermal and Fire Characteristics of FRP Composites for Architectural Applications

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