Analysis of the strength and stiffness of timber beams reinforced with carbon fiber and glass fiber

Fiorelli, Juliano; Dias, Antônio Alves

doi:10.1590/s1516-14392003000200014

Cited by 128 publications

(85 citation statements)

References 2 publications

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“…In order to determine the ultimate bending moment, some authors have developed for FRP reinforcements (Triantafillou and Deskovic, [26]), (Lindenberg,[27]), (Fiorelli and Alves Dias, [15]) theoretical models based on the of hypothesis of Navier/Bernoulli (plane sections remain plane after being strained) and considers the limit states of the timber's tension and compression failure. The timber's tensile limit state is considered to have been attained when the maximum tensile stress is equal to its tensile strength.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

“…Among those that can be cited are those carried out by Plevris and Triantafillou [9] and by Triantafillou [10] dealing with external carbon strengthening (CFRP) in the presence of flexure and shear loads on small dimension samples; by Johns and Lacroix [11] on samples 39x89x1675 mm, strengthened with various FRP patterns; by Borri et al [12,13] on wood beams strengthened using CFRP sheets and bars; by Gentile et al [14], by Fiorelli and Alves Dias [15], Alam et al [16].…”

Section: Introductionmentioning

confidence: 99%

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Strengthening of timber beams with high strength steel cords

Borri

Corradi

2011

Composites Part B: Engineering

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ABSTRACT:This paper presents an experimental study on the strengthening of wood beams under bending loads through the use of very high strength steel cords. The study also presents the results of 21 double shear push-out tests conducted to determine the strength of Steel fiber Reinforced Polymers (SRP) bonded to wood prisms. An experimental programme based on a four-point bending test configuration is proposed to characterize the stiffness, ductility and strength response of strengthened wood beams. Mechanical tests on the strengthened wood showed that external bonding of steel fibers produce high increases in flexural stiffness and capacity. Finally experiment results are used to calibrate existing analytical formulations for capacity prediction. This economic and effective technique may be an interesting alternative to glass or carbon fibres or other expensive retrofitting methods.

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Section: Analysis Of the Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Strengthening of timber beams with high strength steel cords

Borri

Corradi

2011

Composites Part B: Engineering

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“…The required lumber production to meet demand makes this sector one of the leading employers and drives the economy in Brazil (Fiorelli and Dias 2003;Almeida et al 2015;Christoforo et al 2015). Wood is used either directly in the structure of the building or as a component of other subsystems (De Araujo et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Density as Estimator of Dimensional Stability Quantities of Brazilian Tropical Woods

Almeida¹,

Almeida²,

Araújo³

et al. 2017

BioResources

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Wood is a material widely used in various sectors of construction, such as in structures and building components. The volume of wood extracted from tropical forests has reached a considerable amount, and this wood is marketed with popular names without prior characterization. Wood density is an easy property to measure, and its use as an estimator of other properties is very common in this sector. This study investigated the possibility of the estimation of important quantities in dimensional stability of Brazilian tropical woods by using the density at 12% moisture content, anhydrous density, and basic density. Testing the ability to estimate radial, axial, tangential, and volumetric shrinkage, anisotropy coefficient, coefficient of volumetric rate of volumetric shrinkage, as well as the rate of volumetric swelling using the densities above, with linear, exponential, geometric, and logarithmic models, the best determination coefficient was: R 2 = 19.58%. The results were, in summary, that the variable density was not a good estimator of the dimensional stability of the wood.

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“…The increased strength was less than that obtained in preceding similar tests done by the same authors on beams reinforced with glass, carbon and aramid fibers [10]. The use of natural fibers, however, has advantages connected not only with the increase in the load-carrying capacity, but also in terms of energy in consideration of the limited production costs, energy consumption and disposal at the end of their life.…”

Section: Discussionmentioning

confidence: 58%