Density as Estimator of Dimensional Stability Quantities of Brazilian Tropical Woods

Almeida, Tiago Hendrigo de; Almeida, Diego Henrique de; Araújo, Victor Almeida De; Silva, Sérgio A. M. da; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.15376/biores.12.3.6579-6590

Cited by 48 publications

(50 citation statements)

References 22 publications

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“…However, for the design of timber structures, an important factor is the knowledge of the mechanical properties, because wood is a natural material that presents anatomical complexity making difficult to know its exact performance [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Stress Distribution in Tauari Wood Beam

Coimbra¹,

Almeida²,

Almeida³

et al. 2018

ijme

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Wood is widely used in many sectors of civil construction as a structural material. Brazilian code ABNT NBR 7190:1997 "Design of Timber Structures" governs the method of project design as well as the characterization of wood for structural design. In this aspect the code considers wood as an orthoptic material, however is well known that the organic origin provides great anatomical complexity to its. This work aims to study the distribution of normal stresses in a Tauari wood beam subjected to the elastic regime, and to ascertain the current position of the Neutral Line during test. For this purpose, a four-point static bending test and subsequent compression and tension to the grain tests were performed to determine the modulus of elasticity and calculate the normal stresses by recording deformations and applying Hooke's Law. The data were statistically analyzed to define bests adjusts to Stress vs. Strain diagrams, and thus determine the location of the Neutral Line. It was verified that the position of the Neutral Line was a normal distribution variable, being located at 1,07cm above the geometric center of the board. Finally, the comparison between values of normal tension obtained experimentally and through the theoretical method was determined and similarities were verified in these data, being also plausible the theory for the calculation of the normal tensions of the wood beams, when it is in the elastic regime.

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Section: Introductionmentioning

confidence: 99%

Stress Distribution in Tauari Wood Beam

Coimbra¹,

Almeida²,

Almeida³

et al. 2018

ijme

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“…This research was realized with Schizolobium amazonicum Herb wood specie (called also Paricá), wood specie from Amazonian Forest Region [11]. Physical and mechanical properties of this wood have been studied in recent yers with the purpose dissolving its use as na alternative material in relation to other species used in Brazil, such as Pinus and Eucalyptus genus [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Embedment parallel to grain strength is essential in evaluation of structural joints, but it's necessary to observe that some related problems can occur during procedures of nailing or bolting [11][12][13][14][15][16][17]. Molina et al [18] carried out tests to determine embedment strength of Pinus elliotti and Eucaliptus saligna.…”

Section: Introductionmentioning

confidence: 99%

Embedment Parallel to the Grain Strength of the Schizolobium amazonicum Herb Wood Specie

Almeida¹,

Almeida²,

Pinheiro³

et al. 2017

ijme

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Wood is one of the main raw materials used by man in several uses. It can be used in furniture and package industries, and also in components for building construction. For all these purposes, it is necessary to know the physical and mechanical properties of wood specie being used. Brazilian Code ABNT NBR 7190:1997, in its Annex B, presents methods for determining wood mechanical properties, among them the embedment parallel to grain. This property is important because it relates to the design of bolted and nailed joints in timber structures. This research aims to the experimental determination of embedment strength parallel to grain strength for Schizolobium amazonicum Herb, a wood specie recently used for structural purposes. Results showed that embedment strength for Schizolobium amazonicum Herb wood specie is lower when compared with traditional tropical essences, but sufficient for some structural applications.

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“…Wood can be used of several ways, for examples, in civil construction as structural members or materials to buildings and as raw material to panels and furniture industries [1][2][3][4]. In Brazil, woods of the genus Pinus and Eucalyptus from planted forests are used by this companies [5,6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Solid Waste Generation in a Wood Processing Machine

Almeida¹,

Almeida²,

Ferro³

et al. 2017

ijaf

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The processing of the wood generates a significant amount of waste, presenting itself as a problem to the environment. The volume of waste generated from processing depends, in addition to other factors, on the type of processing machine. This work aimed to present a case study regarding the volume of waste generated in the processing of the logs of Eucalyptus sp.genus specie using processing machine Pica-Pau type. Pica-Pau type machine was located in Itapeva (state of São Paulo, Brazil). A total of 38 logs were used, with na average diameter of 34cm (excluding the bark and measured at base and top of the log), average length of 3 m and conicity of 1%. The average volume of 38 logs was equal to 10.35m³ and the volume of residues generated during log processing was 2.17m³, implying a transformation coefficient (C t ) of 79%. Processing machine Pica-Pau type was classifies a good machine to be used in the processing of logs, however, the processing time is higher than the time used by the most used band saws, making it less attractive in the processing of wood by large companies. From the qualitative point, the waste generated in the production of the plank is mostly the sawdust.

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Density as Estimator of Dimensional Stability Quantities of Brazilian Tropical Woods

Cited by 48 publications

References 22 publications

Stress Distribution in Tauari Wood Beam

Stress Distribution in Tauari Wood Beam

Embedment Parallel to the Grain Strength of the Schizolobium amazonicum Herb Wood Specie

Analysis of Solid Waste Generation in a Wood Processing Machine

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