Self-monitoring, pseudo-ductile, hybrid FRP reinforcement rods for concrete applications

Bakis, Charles E.; Nanni, Antonio; Terosky, J.; Koehler, S.W.

doi:10.1016/s0266-3538(00)00184-6

Cited by 129 publications

(78 citation statements)

References 18 publications

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“…They calculated an upper limit of 92% improvement in the This high value could only be achieved at carbon fibre volume fraction below 6%. The importance of fine dispersion for pseudo-ductility is also shown by Bakis et al [66] on pultruded rods. Pseudo-ductility was only achieved for their most finely dispersed carbon/glass hybrid, while lower dispersion resulted in two distinct peaks as shown in Fig.…”

Section: Pseudo-ductilitysupporting

confidence: 56%

“…Due to the overwhelming amount of experimental data confirming the importance of dispersion [14,[64][65][66][67][68], there is no doubt that this is one of the most critical parameters. In these experiments, additional improvements of about 20% in failure strain by increasing the dispersion have been reported by several authors [65,67,68].…”

Section: Degree Of Dispersionmentioning

confidence: 99%

See 1 more Smart Citation

Fibre hybridisation in polymer composites: A review

Swolfs

Gorbatikh

Verpoest

2014

Composites Part A: Applied Science and Manufacturing

704

462

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Fibre-reinforced composites are rapidly gaining market share in structural applications, but further growth is limited by their lack of toughness. Fibre hybridisation is a promising strategy to toughen composite materials. By combining two or more fibre types, these hybrid composites offer a better balance in mechanical properties than non-hybrid composites. Predicting their mechanical properties is challenging due to the synergistic effects between both fibres. This review aims to explain basic mechanisms of these hybrid effects and describes the state-of-the-art models to predict them. An overview of the tensile, flexural, impact and fatigue properties of hybrid composites is presented to aid in optimal design of hybrid composites. Finally, some current trends in fibre hybridisation, such as pseudoductility, are described.

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Section: Pseudo-ductilitysupporting

confidence: 56%

Section: Degree Of Dispersionmentioning

confidence: 99%

Fibre hybridisation in polymer composites: A review

Swolfs

Gorbatikh

Verpoest

2014

Composites Part A: Applied Science and Manufacturing

704

462

View full text Add to dashboard Cite

show abstract

“…Based on the existing experimental data summarizing tension, pull-out, and flexural tests, in which no significant slip between material layers was reported, this appears to be a reasonable model [1,[9][10][11][12][13][14][15].…”

Section: Bar Analysismentioning

confidence: 95%

“…Ductility is a particular concern from a safety perspective [10], as the nearly linear-elastic response of traditional FRP bars until rupture allows little warning before failure, nor does it allow moments to be significantly redistributed in indeterminate structures. In the last two decades, however, work has been done by various researchers to increase ductility, and significant ductility has been achieved by numerous bar designs [1,[9][10][11][12][13][14][15]. Although different techniques have been proposed to achieve pseudo-ductile response in FRP structures, most successful ductile FRP reinforcement bar designs have use the "hybrid" approach.…”

Section: Introductionmentioning

confidence: 99%

Analysis of alternative ductile fiber-reinforced polymer reinforcing bar concepts

Behnam

Eamon

2013

Journal of Composite Materials

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Steel-reinforced concrete structural components are often associated with significant maintenance costs as a result of reinforcement corrosion. To mitigate this problem, fiberreinforced polymer (FRP) bars have been used in place of traditional steel reinforcement for some applications. The non-ductile response of typical FRP bars is a concern, however. To overcome this problem, hybrid ductile FRP (HDFRP) bars have been developed for use in concrete flexural members with resulting ductility indices similar to sections reinforced with steel. In this study, five different HDFRP bar concepts are analyzed and compared in terms of ductility, stiffness, and relative cost. Of primary interest is the effect that the number of materials used in bar construction has on performance. Reinforced concrete beam and bridge deck applications are considered for analysis. It was found that all HDFRP-reinforced flexural members considered could meet code-specified strength and ductility requirements for steelreinforced sections, although service load deflections were approximately twice that of steelreinforced sections of the same depth. In general, ductility increased, and overall material cost decreased, as the bar material layers increased from 2 to 4. The 4-material continuous fiber bar approach was found to be most promising, with high ductility as well as relatively low cost.

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“…With this reason, the concept of "hybridization" was arisen for the FRP rebar to overcome their shortcomings. The hybridization of FRP has been investigated by many researchers [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Enhancement in Elastic Modulus of GFRP Bars by Material Hybridization

Seo¹,

Park²,

You³

et al. 2013

ENG

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Fiber reinforced polymer (FRP) reinforcing bars for concrete structure has been extensively investigated for last two decades and a number of FRP bars are commercially available. However, one of shortcomings of the existing FRP bars is its low elastic modulus, if glass fibers are used (i.e., GFRP). The main objective of this study using the concept of material hybridization is to develop a viable hybrid FRP bar for concrete structures, especially for marine and port concrete structures. The purposes of hybridization are to increase the elastic modulus of GFRP bar with acceptable tensile strength. Two types of hybrid GFRP bar were considered in the development: GFRP crust with steel core and GFRP bar with steel wires dispersed over the cross-section. Using E-glass fibers and unsaturated polyester resins, the hybrid GFRP bar samples of 13 mm in diameter were pultruded and tested for tensile properties. The effect of hybridization on tensile properties of GFRP bars was evaluated by comparing the results of tensile test with those of non-hybrid GFRP bars. The results of this study indicated that the elastic modulus of the hybrid GFRP bar was increased by up to 270 percent by the material hybridization. The results of the test and the future recommendations are summarized in this paper. To ensure long-term durability of the hybrid GFRP bars in waterfront structure applications, the individual and combined effects of environmental conditions on hybrid GFRP rebar itself as well as on the interface between rebar and concrete should be accessed.

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Self-monitoring, pseudo-ductile, hybrid FRP reinforcement rods for concrete applications

Cited by 129 publications

References 18 publications

Fibre hybridisation in polymer composites: A review

Fibre hybridisation in polymer composites: A review

Analysis of alternative ductile fiber-reinforced polymer reinforcing bar concepts

Enhancement in Elastic Modulus of GFRP Bars by Material Hybridization

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