Evaluation of the Modulus of Elasticity in Damaged Wooden Beams

Christofóro, André Luis; Panzera, Túlio Hallak; Silva, Leandro José da; Araújo, Victor Almeida De; Silva, Diogo Aparecido Lopes; Lahr, Francisco Antônio Rocco

doi:10.5923/j.ijme.20150504.03

Cited by 7 publications

(5 citation statements)

References 7 publications

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“…A good way to begin an inspection for decay is a visual inspection technique search for decay manifestations, emphasizing locations or conditions most conducive to prolonged wetting [12][13][14][15].…”

Section: Inspection Techniques To Assess Timber Structuresmentioning

confidence: 99%

Historic “HAUFF” Timber Roofs in Poços de Caldas in Brazil

Brito¹,

Christofóro²,

Segundinho³

et al. 2016

ijme

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This research presents the assessment of historic structural systems timber roofs type "Hauff" of constructions existing in Poços de Caldas, Minas Gerais, Brazil. The large timber structures originated with the engineering company "Hauff", whose production of timber structures contributed in great measure to the technological advance of the industry of construction engineering with wood in Brazil. Based on photographic by techniques of visual inspection (NDT) and descriptive documentation, this paper offers examples of timber roof structures that constitute most of type "Hauff" roof structural systems, such as, lamellar roof structure, sawn lumber nailed arch, plywood arch, shed truss roof, that were built between the years 40 and 60 in the city at Poços de Caldas in Minas Gerais. The timber structures with "Hauff" were built in various regions of Brazil at that time.

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Section: Inspection Techniques To Assess Timber Structuresmentioning

confidence: 99%

Historic “HAUFF” Timber Roofs in Poços de Caldas in Brazil

Brito¹,

Christofóro²,

Segundinho³

et al. 2016

ijme

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“…Therefore, by the binding legal requirements of the countries, only wood with a designated strength class can be used for applications in the construction sector. Thus, it is aimed to ensure both structural safety and economical use of the material (Faria et al 2012;Christoforo et al 2015;Ridley-Ellis et al 2016;Burawska-Kupniewska et al 2020;Krzosek et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Visual and machine strength gradings of Scots and red pine structural timber pieces from Türkiye

Kurul,

2024

BioRes

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Scots (Pinus sylvestris L.) and red pine (Pinus brutia Ten.) structural timbers (540 pieces) from Türkiye were first visually graded according to TS 1265 (2012). Then, non-destructive tests were conducted using vibration and time of flight (ToF) methods, followed by destructive tests on a four-point bending test setup according to EN 408 (2012). The vibration method showed a higher correlation than ToF with strength and stiffness. The dynamic modulus of elasticity (MOEd) obtained by the vibration method was 12.3% and 15.4% lower in Scots and red pine, respectively, compared to the ToF method. Mechanical testing determined local MOE was 14% and 15% higher than global MOE for Scots and red pine, respectively. An alternative formula to the existing conversion formula in EN 384 (2018) was derived. The average bending strength of red pine was 7% higher than Scots pine. For visual strength grading, local and global MOE in Scots pine, class 1, 2, and 3 structural timbers were assigned to C35, C27, and C22, respectively. Red pine was assigned to C40, C27, and C24 for local MOE and C35, C24, and C22 for global MOE. In machine strength grading, the grade combination was C40-C30-C22-C16-R for both species. The best results were achieved in settings where vibration method and local MOE were used together. Machine strength grading achieved higher efficiency than visual strength grading.

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“…Other relevant study [14] have examined two methods of calculation to obtain the bending modulus of elasticity in wooden specimens of Paricá (Shizolobium amazonicum) with some defects created: a simplified, adapted from ABNT NBR 7190: 1997, and another based on the least square method. Results of the confidence intervals showed that de modulus of elasticity for both ways of calculation were equivalent for non-defective specimens.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Two Methods to Determine the Bending Modulus of Elasticity of Wood

Marini¹,

Christofóro²,

Lahr³

2018

ijme

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The modulus of elasticity is among the main properties required for the dimensioning of a wood structure. It can be calculated using different test methods, the most commonly used are the 3 and 4 points bending tests. The Brazilian standard, ABNT NBR 7190: 1997, recommends the 3-point static bending test. Studies about the influence of testing methods to determine the bending modulus of elasticity are always relevant, since can improve its reliability. Thus, the aim of this study is to examine the bending modulus of elasticity of samples of nine Brazilian wood species: Cambará Rosa (Erisma uncinatum Warm), Caxeta (Tabebuia cassinoides), Tatajuba (Bagassa guianensis), Itaúba (Mezilaurus itauba), Branquilho (Termilalia spp), Cedro Amazonense (Cedrelinga catenaeformis Ducke), Roxinho (Peltogyne spp.), Cumaru (Dipteryx odorata) and Cambará (Gochnatia polymorpha). The results of the confidence intervals have showed that the moduli of elasticity for both test methods were equivalent at 5% significance level.

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Evaluation of the Modulus of Elasticity in Damaged Wooden Beams

Cited by 7 publications

References 7 publications

Historic “HAUFF” Timber Roofs in Poços de Caldas in Brazil

Historic “HAUFF” Timber Roofs in Poços de Caldas in Brazil

Visual and machine strength gradings of Scots and red pine structural timber pieces from Türkiye

Comparison of Two Methods to Determine the Bending Modulus of Elasticity of Wood

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