Numerical Evaluation of the Mechanical Behavior of a Particulate Composite Material as Reinforcement in Timber Beams

Braz, Júlio César Ferreira; Layber, Roberto Bianchini; Lauro, Carlos Henrique; Christofóro, André Luis; Panzera, Túlio Hallak; Antônio, Francisco; Lahr, Rocco; Regina, Vânia; Silva, Velloso

doi:10.5923/j.cmaterials.20130304.01

Cited by 7 publications

(2 citation statements)

References 12 publications

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“…The mechanical properties of the composite material and wood used in the numerical simulations of axial compression tests were obtained from the research developed by Panzera et al [17] and the Brazilian standard ABNT NBR 7190 [18], as well as done in the research of Braz et al [19], that evaluate numerically the mechanical behavior of timber beams with the same composite material.…”

Section: Methodsmentioning

confidence: 99%

“…This consideration is commonly used in structural projects, since the Brazilian standard makes no references to calculate the longitudinal modulus elasticity in the three directions, longitudinal, radial and tangential, neither for the shear modulus of elasticity (G) and their respective Poisson ratio (ν) of the material. In the simulations, the Poisson ratio of the wood was considered equal to zero, as well as assumed by [19].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Analyses of Timber Columns Reinforced by Particulate Composite Material

Carvalho¹,

Leila²,

Dias³

et al. 2016

TOBCTJ

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Beams are structural elements commonly used in structure for construction designs. Usually wood is applied as structural elements and its use is very important because it is a material of renewable source, low density and satisfactory mechanical performance. When the wood surface is not properly treated, the structure can be destroyed not only by environmental conditions but also the attack of insects, compromising the structural design. This research presents the use of a particulate composite material of epoxy resin reinforced with white Portland cement in order to be applied as repair in timber columns. The mechanical performance of this material is essentially numerical, based on the Finite Element Method. The wood used in the simulation was the Eucalyptus grandis. The elastic properties were obtained from the specialist literature in the field of timber structures. The results of numerical simulations in terms of tension and buckling loads, the inclusion of the composite in the damaged regions (for all dimensions of the defects studied) provided buckling load results significantly higher than the buckling load values for the conditions without composite, and near to the values of the buckling loads without defect, highlighting the good performance of the particulate composite material in the repair of timber columns.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Numerical Analyses of Timber Columns Reinforced by Particulate Composite Material

Carvalho¹,

Leila²,

Dias³

et al. 2016

TOBCTJ

View full text Add to dashboard Cite

show abstract

Epoxy mortar timber beam upgrading

Carvalho

Panzera

Christofóro

et al. 2017

International Wood Products Journal

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The physical and mechanical properties of brown-pigmented particulate composites based on epoxy polymer reinforced with quartz particles were assessed experimentally. The best setup condition was chosen to repair Maçaranduba and Cedrinho timber species. A full factorial design was conducted to evaluate the effect of the quartz particle (0, 40, 50, 60 wt-%) and pigment (0, 0.02 wt-%) inclusions on the density, apparent porosity, compressive modulus and strength. The composite made with 50 wt-% of quartz particles and 0.02 wt-% of pigment revealed promising characteristics for restoration works, being used to repair the upper (under compression) side of timber beams evaluated under four-point bending tests. The timber beams were evaluated in pristine, with defect and in repaired conditions. Repaired Cedrinho timber achieved similar mechanical behaviour when compared with pristine conditions. In contrast, the repair procedure was not successful in restoring the load capacity of damaged Maçaranduba timber beams.

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Real‐Time Monitoring of Timber‐Surface Crack Repair Using Piezoelectric Ceramics

2021

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Real-time assessment of timber-surface crack repair is crucial to the stability and safety of timber structures. Epoxy resin was used to repair timber cracks, and the active sensing technique using piezoelectric ceramics was applied to monitor the repair process of timber surface cracks in real time. Sixteen wood samples were designed for axial compression tests and active monitoring tests. A pair of lead zirconate titanate patches was pasted on the surface of the timber specimens as actuators and sensors for signal transmission and reception, through wavelet packet analysis, the variations in the signal amplitude, and wavelet coefficients. The relationship between the wavelet packet energy of the monitoring signal and the ultimate bearing capacity of the specimens at different periods after grouting was established. Based on the root-mean-square deviation, the damage index, DI, was introduced to evaluate the repair degree of timber surface cracks quantitatively. The results showed that the active sensing method can evaluate the strength development in timber-surface crack repair in real time.

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Numerical Evaluation of the Mechanical Behavior of a Particulate Composite Material as Reinforcement in Timber Beams

Cited by 7 publications

References 12 publications

Numerical Analyses of Timber Columns Reinforced by Particulate Composite Material

Numerical Analyses of Timber Columns Reinforced by Particulate Composite Material

Epoxy mortar timber beam upgrading

Real‐Time Monitoring of Timber‐Surface Crack Repair Using Piezoelectric Ceramics

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