Stress Distribution in Tauari Wood Beam

Coimbra, Paulo Ricardo Santos; Almeida, Andréa de Souza; Almeida, Tiago Hendrigo de; Almeida, Diego Henrique de; Chahud, Eduardo; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.5923/j.ijme.20180801.02

Cited by 3 publications

(1 citation statement)

References 8 publications

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“…These wood species are suitable for structural purposes, such as, for beams. (Lahr et al, 2016;Coimbra et al, 2018). Forty-eight (48) test specimens were prepared to evaluate tensile strength parallel to grain, according to Annex B of Brazilian Standard ABNT NBR 7190 (1997).…”

Section: Methodsmentioning

confidence: 99%

Influence of Reinforcement on Wood Tensile Strength Submitted to Weathering

et al. 2021

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Wood is an important building material used in roof structures, bridges, viaducts, and pedestrian bridges. In order to improve its use, as well as rehabilitate structural parts deteriorated by weathering, reinforcement of beams and columns with composite material is performed. Given the climate action on structures, it is important to know the influence and behavior of wood and composite material when subjected to weathering. This study aimed to evaluate the influence of the reinforcement of CCB-treated wood with carbon fiber reinforced polymer (CFRP) and subjected to artificial weathering on its tensile strength parallel to the fibers. The results showed a 30% reduction in strength due to weathering and a 25% increase in tensile strength, showing the positive influence of reinforcement even under artificial weathering conditions

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Section: Methodsmentioning

confidence: 99%

Influence of Reinforcement on Wood Tensile Strength Submitted to Weathering

et al. 2021

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Representativeness of the fiber parallel elasticity modulus value referring to the Brazilian standard C40 strength class in the design of timber structures

et al. 2023

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Brazil has the world’s second largest forest area, which makes the exploitation and use of varied species in civil construction conducive. One of the traditional uses of wood is to build roofs for different purposes. Considering that the most recurrent pathologies in the roof structures are related to the excessive deformations observed in the structural elements, particularly in those subjected to bending. This study verified the effective representativeness of the stiffness value established by the Brazilian Class wood standard, C40. Batches of eight different tropical wood species were considered, whose framing occurred in the referred Class. Results obtained from the confidence intervals for each evaluated species led to the conclusion that the value of 19500 MPa for the modulus of elasticity is not representative for Class C40 because the value observed in this study was 14467 MPa, which is 26% lower than the normative reference. This observation is an initial indication that the adoption of the value of 19500 MPa by the standard is unfavorable to the safety of the structure, justifying the pathologies observed in the service performance of the roof structures.

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Influence of Stiffness Related to the C40 Strength Class of the Hardwood Group Established by the Brazilian Standard in the Design of Timber Structures

Lahr¹,

Aquino²,

Arroyo³

et al. 2021

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The Brazilian standard ABNT 7190 (1997) establishes the strength classes C20, C30, C40 and C60 for the proper framework of the different wood types in the group of hardwoods. Associated with the strength class, which is based on the compressive strength characteristic value parallel to the fibers (fc0,k), the standard stipulates the respective values representing the stiffness (Ec0), with 19500 MPa being the reference value for the class C40, essential variables in structural design. For being the C40 class is the one with the greatest amplitude (20 MPa), it is possible that the value 19500 MPa is not the best representation of stiffness. This work aimed to verify the representativeness the stiffness value established by the Brazilian standard for C40 wood. The result obtained from the average confidence interval indicates the value of 14110 MPa as being the most representative, which may imply structures that are supposedly more rigid than they really are.

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Stress Distribution in Tauari Wood Beam

Cited by 3 publications

References 8 publications

Influence of Reinforcement on Wood Tensile Strength Submitted to Weathering

Influence of Reinforcement on Wood Tensile Strength Submitted to Weathering

Representativeness of the fiber parallel elasticity modulus value referring to the Brazilian standard C40 strength class in the design of timber structures

Influence of Stiffness Related to the C40 Strength Class of the Hardwood Group Established by the Brazilian Standard in the Design of Timber Structures

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