The tensile performance of FRP bars embedded in concrete under elevated temperatures

Najafabadi, Esmaeil Pournamazian; Oskouei, Asghar Vatani; Khaneghahi, Mohammad Houshmand; Shoaei, Parham; Ozbakkaloglu, Togay

doi:10.1016/j.conbuildmat.2019.03.239

Cited by 67 publications

(23 citation statements)

References 41 publications

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“…Silva et al [26] pointed out that the elastic modulus of GFRP composites was mainly influenced by the environmental temperature. The test results reported by Najafabadi et al [27] indicated that the elastic modulus of GFRP bars started to descend when the environmental temperature reached the glass transition temperature (Tg).…”

Section: Tensile Elastic Modulusmentioning

confidence: 99%

Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Yang

2021

Science and Engineering of Composite Materials

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Two categories of GFRP specimens, in nominal diameters of 11.2 mm and 15.6 mm respectively, made of E-glass fibers and a vinylester resin were immersed in alkaline solution, saline solution and tap water solution at room temperature. The mechanical and durability properties of tested GFRP bar specimens were determined through direct tensile test and short-beam shear test after exposure to aggressive solutions for different days. The obtained results indicated that for all tested GFRP bar specimens the failure modes of fiber rupture in the tensile test and horizontal cracking in the short-beam shear test would not obviously change with the increasing of exposure period. However, the impact of immersion solutions on the durability degradation of mechanical properties of GFRP bars appeared in the ultimate strength and displacement at failure, and at room temperature the alkaline solution had a greater impact than another two solutions. Under the same exposure conditions, the resistance to the strength degradation of the GFRP bars with a larger diameter was better than that of the smaller GFRP bars. The comparison results indicated that the strength degradation trend of conditioned GFRP bars presented in our study was basically in agreement with the data given in previous studies.

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Section: Tensile Elastic Modulusmentioning

confidence: 99%

Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Yang

2021

Science and Engineering of Composite Materials

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“…Over the past years, some scholars have studied the bonding properties, fire resistance performance, high temperature properties and seismic performance of FRP reinforced concrete (RC) beams [2][3][4]. Nigro et al provided a conceptual approach to fire safety checks for bending moment resistance of FRP-RC members and suggested a simplified design method for sagging bending moment resistance of FRP-RC slabs in fire situations with reference to thermo-mechanical analysis [2].…”

Section: State Of the Artmentioning

confidence: 99%

“…Nigro et al provided a conceptual approach to fire safety checks for bending moment resistance of FRP-RC members and suggested a simplified design method for sagging bending moment resistance of FRP-RC slabs in fire situations with reference to thermo-mechanical analysis [2]. Najafabadi et al investigated the mechanical properties of glass and carbon FRP bars with epoxy resin matrices embedded in concrete under an extensive range of elevated temperatures and embedded FRP bars with various bar diameters [3]. Lin and Zhang modelled several FRP-reinforced concrete beams by using a recently developed a two-node layered composite beam element and investigated the effect of different surfaces of FRP reinforcing bars on the structural response of FRP-reinforced concrete beams with bond-slip effect [4].…”

Section: State Of the Artmentioning

confidence: 99%

Performance of Concrete Beam Strengthened with Prestressed Sprial Steel Wires

Ding¹,

Zhang²,

Zhang³

2019

JESTR

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In view of the defects and limitations of the existing reinforcement methods, it is necessary to put forward a reinforcement method with better interfacial bond performance, more convenient construction and economical reinforcement. A new reinforcement technique with prestressed spiral steel wires was presented, and one control beam, three strengthened beams under monotonic loading were tested. Under the same initial prestressing level, the amount of reinforcement and different groove sizes, the flexural capacity, load-deflection relationship, crack and deformation of reinforced concrete beams were systematically investigated. Results show that the reinforcement technique can significantly improve the first-crack load, steel-yielding load, ultimate load of the beams, and improve the service performance of the strengthened beams. The high performance of the spiral steel wires is allowed for better utilization. The conclusions obtained in the study are of important reference value to direct the similar engineering practice.

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“…Another study by Ospina and Bakis [16] demonstrated that higher amount of the GFRP flexural reinforcement ratio in concrete beams led to narrower crack widths. In addition, a decrease in the bar diameter led to a lower tensile strength of GFRP bars [17].…”

Section: Introductionmentioning

confidence: 99%

Non-linear behaviour of concrete beams reinforced with GFRP and CFRP bars grouted in sleeves

Kazemi

Harehdasht

et al. 2020

Structures

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The low-quality bond between fibre reinforced polymer (FRP) bars and surrounding concrete has drawn the attention of many researchers. The use of high-strength materials such as the grout in the intersection of FRP bars and surrounding concrete can effectively prevent any slippage once they are in contact and subsequently increase the bond quality. Therefore, this study was numerically focused on the flexural behaviour of concrete beams reinforced with glass fibre reinforced polymer (GFRP) and carbon fibre reinforced polymer (CFRP) bars, grouted only in the pure bending zone and along the whole beam length. The numerical outputs revealed that the grouted GFRP bars propagated the maximum principal stress in high-strength concrete beams, but not as much as that in normal-strength concrete specimens. In addition, the stress distribution in the grout, created only in the pure bending zone, was nearly constant at the ultimate moment.For the grout, developed along the whole beam length, this stress increased by approaching the mid-span of the concrete beam. Furthermore, at the ultimate moment, the tensile stress of 12-mm diameter CFRP bars was about 3.5 times more than that of the 16-mm diameter CFRP bars, leading to the generation of difference between failure modes of concrete specimens reinforced with various diameters of CFRP bars.

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The tensile performance of FRP bars embedded in concrete under elevated temperatures

Cited by 67 publications

References 41 publications

Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Mechanical and durability properties of GFRP bars exposed to aggressive solution environments

Performance of Concrete Beam Strengthened with Prestressed Sprial Steel Wires

Non-linear behaviour of concrete beams reinforced with GFRP and CFRP bars grouted in sleeves

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