Ductility of nonmetallic hybrid fiber composite reinforcement for concrete

Tepfers, Ralejs; Tamužs, Vitauts; Apinis, R. P.; Vilks, U. K.; Modniks, Jānis

doi:10.1007/bf02254777

Cited by 18 publications

(11 citation statements)

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“…To overcome these problems, hybrid FRP composites were developed by different researchers. [19][20][21][22][23][24] The hybridization of different types of fibers could overcome their shortcomings, integrate their advantages, and consequently achieve a high performance-to-price ratio. In addition, through hybridization, the mechanical properties of the FRP composites can be designed for specific applications.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, due to its low‐creep rupture limit (0.3 f u according to ACI‐440.1R), GFRP is not suitable for prestressing tendons. To overcome these problems, hybrid FRP composites were developed by different researchers . The hybridization of different types of fibers could overcome their shortcomings, integrate their advantages, and consequently achieve a high performance‐to‐price ratio.…”

Section: Introductionmentioning

confidence: 99%

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Static behavior of RC deck slabs partially prestressed with hybrid fiber reinforced polymer tendons

Wang

Ali

Ding

et al. 2018

Structural Concrete

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The design of traditional FRP‐RC deck slabs incurs a waste of FRP due to the minimum limit of reinforcement ratio recommended by the current design specifications. This paper investigates the static behaviors of full‐scale RC deck slabs transversely reinforced and prestressed with basalt/carbon fiber reinforced polymer (FRP) hybrid tendons, which are capable of enhancing the utilization efficiency of FRP reinforcement. Two nonprestressed control deck slabs and five prestressed FRP‐RC deck slabs were tested up to failure. The experimental variables included FRP‐reduction factor, prestress level and partial prestressing index. The results indicate that the amount of bottom transverse reinforcement of FRP‐RC deck slabs is reduced by 45% through introducing prestressing into FRP reinforcement. Those three variables have negligible effect on the failure mode of the prestressed FRP‐RC deck slabs. The FRP‐reduction factor primarily affects the ultimate load and cracking load, crack width, and strain in nonprestressing reinforcements and concrete. Prestressing level has significant effects on the cracking load, deflection, crack width and strain in nonprestressed reinforcements. By contrast, partial prestressing index has no effect on the static behaviors of the FRP‐RC deck slabs. Furthermore, the residual crack width and deflection of FRP‐RC deck slabs are controlled significantly by prestressing, which contributes to realizing a superior long‐term behavior of the deck slabs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Static behavior of RC deck slabs partially prestressed with hybrid fiber reinforced polymer tendons

Wang

Ali

Ding

et al. 2018

Structural Concrete

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“…Variations of this approach have been adopted by a number of other researchers . Tepfers et al investigated the effects of different core and braid combinations on tensile properties of bars produced by braiding around solid, hollow, and foam cores. In addition to modifying the rebar properties, researchers such as Belarbi et al have investigated creating smart FRP rods, by integrating fiber optic strain gages into the structure.…”

Section: Introductionmentioning

confidence: 99%

Modeling and mechanical characterization of braidtruded fiber reinforced polymer rebar

2016

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Traditional steel rebar used for concrete reinforcement can be susceptible to corrosion. One solution to this problem is to substitute fiber reinforced polymer (FRP) rebar in the place of steel. However, conventional unidirectional FRP rebars are limited by a linear elastic failure mode at relatively low ultimate strains. In this study, FRP rebar was developed to behave in a pseudoductile manner, where a progressive failure was achieved based on the composite architecture. Hybrid FRP rebar consisting of a unidirectional carbon fiber core encased in a braided aramid fiber overwrap was manufactured, and a model was developed to reflect the tensile response of the rebar based on constituent material properties and geometric parameters. Experiments were conducted in order to validate the model, which was successful in reflecting the pseudoductile tensile behavior exhibited by the rebar. POLYM. COM-POS., 39:1582-1593, 2018

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“…These composites are widely used in aeronautical and space engineering, shipbuilding, oil refinary, and oil and gas pipelines [1,8,14,21,23]. Fibrous composites as reinforcement of concrete structures have recently aroused considerable interest [26,32].Under long-term loads, viscoelastic fibrous composites creep even at temperatures far below the glass-transition temperature. This effect necessitates using creep strain, creep rate, relaxation time, creep limits, and long-term strength as the main deformation and strength characteristics of composites.…”

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confidence: 99%

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Nonlinear creep of unidirectional fibrous composites tensioned along the reinforcement

2007

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Creep strains in unidirectional organic-fiber-and organic-glass-fiber-reinforced plastics subject to tension in the reinforcement direction are predicted. Based on homogeneity condition and statistical criteria, it is shown that the creep of the composites is essentially nonlinear. To predict creep strains, use is made of a nonlinear creep model based on a modified Rabotnov's similarity hypothesis for isochrones and of material constants determined from tests on specimens made of a composite as a whole and specimens made of its separate components, the mixing rule applied in the latter case. The calculated results and the experimental data are in satisfactory agreement Introduction. Many unidirectional fibrous composites are engineering materials in which a viscoelastic matrix is reinforced with various organic and inorganic fibers. These composites are widely used in aeronautical and space engineering, shipbuilding, oil refinary, and oil and gas pipelines [1,8,14,21,23]. Fibrous composites as reinforcement of concrete structures have recently aroused considerable interest [26,32].Under long-term loads, viscoelastic fibrous composites creep even at temperatures far below the glass-transition temperature. This effect necessitates using creep strain, creep rate, relaxation time, creep limits, and long-term strength as the main deformation and strength characteristics of composites. One of the important problems in the mechanics of viscoelastic composites is to predict their viscoelastic properties from the properties and volume fractions of its components.A great many theoretical and experimental studies are concerned with various aspects of creep in unidirectional fibrous composites. Some of the results from such studies are reviewed in [8,9,14,15,23,30]. It should be noted that the overwhelming majority of studies deal with the linear range of long-term viscoelastic deformation. All solutions found are based on the Boltzmann-Volterra theory of linear viscoelasticity [11,31]. When used to predict creep strains of composites from the properties of their components, the linear theory is usually supplemented with the mixing rule [8,14,15,23].Theoretical and experimental studies of creep of various polymer composites show that the linear theory of viscoelasticity can be directly applied to a certain class of problems. In the majority of composites, however, the range of linearity is relatively short, and satisfactory results can only be obtained with not too high stresses and short-term loads. It should be taken into account that a portion of the creep strain may be irreversible.There are several approaches to describe the nonlinear viscoelastic deformation of composites. The general nonlinear equation of viscoelasticity was derived in [33]. It is represented by an infinite series of multiple integrals; therefore, it is not practical to identify numerous kernels and to determine their parameters experimentally. Similar difficulties arise in using the nonlinear models proposed in [4,6,7,10,13,22].The approach based on ...

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Ductility of nonmetallic hybrid fiber composite reinforcement for concrete

Cited by 18 publications

References 1 publication

Static behavior of RC deck slabs partially prestressed with hybrid fiber reinforced polymer tendons

Static behavior of RC deck slabs partially prestressed with hybrid fiber reinforced polymer tendons

Modeling and mechanical characterization of braidtruded fiber reinforced polymer rebar

Nonlinear creep of unidirectional fibrous composites tensioned along the reinforcement

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