Deformaciones Diferidas en Probetas Pequeñas Y Libres De Defectos De Eucalyptus Grandis De Argentina

Calvo, Carlos Fabio; Cotrina, Alberto Daniel; Cuffré, Alejandro Guillermo; Piter, Juan Carlos Jesús; Stefani, Pablo Marcelo; Torrán, Eduardo Antonio

doi:10.4067/s0718-221x2002000200002

Cited by 4 publications

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“…1, where it is possible to appreciate separately the mean values of u/u inst for i) the whole sample, ii) the beams free of pith and iii) the pieces with pith. In relation to the whole sample, and in line with other reports (Andriamitantsoa 1995, Calvo et al 2002, a relatively rapid increase of u/u inst at the beginning of the test can be found. The creep rate goes on with a significant slope up to 2 months, although its slope is smaller than the one registered during the first week.…”

Section: Resultssupporting

confidence: 75%

“…Results of a research carried out with small clear specimens of Argentinean Eucalyptus grandis (Calvo et al 2002) Table 3 Summary of results for relative deflections (u/u inst ) corresponding to different periods of time after loading Tabelle 3 Ergebnisse der relativen Durchbiegungen (u/u inst ) für verschiedene Zeiträume nach der Belastung similar conditions to the present structural beams, show mean values of 1.48, 2.25 and 2.25, for the same relation and the same periods of time after loading. The great difference found between these results may be explained by the influence of variation in moisture content, which is greater and faster in small-scale specimens than in structural timber.…”

Section: Resultsmentioning

confidence: 99%

“…As a consequence, the behaviour of this timber species under this load-duration class is not well known. Deflection data obtained from tests on small clear specimens of Argentinean Eucalyptus grandis in indoor environment under one-year load are reported by Calvo et al (2002).…”

Section: Introductionmentioning

confidence: 99%

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Deflections in beams of Argentinean Eucalyptus grandis under long-term loading

2006

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The present paper reports the results of an investigation regarding the analysis of deflections in structural-sized beams of fast-growth Argentinean Eucalyptus grandis under a one-year loading and in indoor climate. An empirical research project with a sample containing 16 beams was carried out. 8 pieces were free of pith and another 8 pieces contained pith. The results obtained allow to compare the creep behaviour of this timber species with those reported by other researchers for both structural-sized and small-clear specimens. The research confirms the design rules adopted by Eurocode 5 for calculating the creep deflections of this timber species under a long-term load. Results also evidence a slight influence of the presence of pith on creep, confirming similar creep behaviour for different qualities of this timber species. Durchbiegungen von Biegeträgern aus Eucalyptus grandis aus Argentinien unter langer Lasteinwirkung Zusammenfassung

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 99%

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Deflections in beams of Argentinean Eucalyptus grandis under long-term loading

2006

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“…Ésta exhibe una mayor inclinación de las micro-fibrillas de la pared celular que la madera madura, lo cual disminuye su resistencia y rigidez (Chan-Martín et al 2002, Donaldson 2008, Yin et al 2011) e influye sobre el desarrollo de las deformaciones diferidas (Roszyk et al 2010, Roszyk et al 2012. En Argentina se han publicado estudios de las deformaciones diferidas en el Eucalyptus grandis de rápido crecimiento, llevados a cabo tanto sobre pequeñas probetas (Calvo et al 2002) como sobre piezas de tamaño estructural en estado inicial seco (Piter et al 2006, Piter et al 2007) y en estado inicial verde (Torrán et al 2008). Respecto de las especies que son objeto de este proyecto, se han reportado resultados preliminares que proveen valores medios de las deformaciones diferidas en forma discriminada para cada especie y para piezas con y sin médula (Fank et al 2017, Fank 2018.…”

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Vigas de pino resinoso del noreste de Argentina bajo cargas de larga duración: Deformaciones, recuperación y criterios de diseño

Fank

Ramos

Torrán

et al. 2021

Maderas, Cienc. tecnol.

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En este artículo se presentan y discuten los resultados de un proyecto orientado a investigar las deformaciones bajo carga de larga duración, y la recuperación luego de la descarga, en vigas de pino resinoso de rápido crecimiento (Pinus taeda y Pinus elliottii) cultivado en el noreste de Argentina. La investigación empírica se llevó a cabo en un local sin climatización con el propósito de incorporar fluctuaciones de la temperatura y la humedad relativa ambiente durante el período de carga, utilizando una muestra integrada por 14 vigas de muy variada calidad. Las deformaciones se registraron bajo carga constante durante 392 días y luego libres de carga durante un período de recuperación de 28 días. No obstante, las variaciones climáticas producidas, se encontró una destacada similitud entre el valor de la deformación inicial instantánea de cada viga y el de su recuperación instantánea luego de la descarga. Los resultados también probaron que, independientemente de la calidad de la madera, el desarrollo de las deformaciones diferidas se mantiene estable y las reglas de diseño resultan eficaces para calcular su valor si el nivel de tensión en la viga es inferior al 35 % de su resistencia instantánea.

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Scaling and modeling the creep of Eucalyptus globulus

Lopes¹,

Matos²

2019

Maderas, Cienc. tecnol.

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Eucalyptus, with the commercial name of Blue gum, is a viscoelastic material strongly influenced when under constant load (creep), being this phenomenon -in the context of displacements -exacerbated with transient relative humidity (variations of the water content in the wood material).The evaluation of bending creep was done in indoor / constant and transient humidity conditions. In the latter, mechano-sorptive effect, the creep bending tests were done for a period of 60 days with cycles of wetting-and-drying. Each cycle has 7 days of duration. Defect free specimens with dimensions of 20 x 20 x 400 mm 3 (approximately to the scale 1:10) of Eucalyptus globulus wood species were used.To fit the creep behaviour and extrapolate results for different periods (1, 10 and 50 years) a survey of different numerical models was done. Rational, parabolic and polynomial functions were chosen.In bending, Blue gum wood species presented a behaviour without a creep limit, therefore labile. Through the models used for extrapolations a significant variability was found for different periods. Values of the main standard of wood design (Eurocode 5) were exceeded. The most consistent mathematical model was the rational model because it is the one that has led to closer and stable results.

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Deformaciones Diferidas en Probetas Pequeñas Y Libres De Defectos De Eucalyptus Grandis De Argentina

Cited by 4 publications

References 0 publications

Deflections in beams of Argentinean Eucalyptus grandis under long-term loading

Deflections in beams of Argentinean Eucalyptus grandis under long-term loading

Vigas de pino resinoso del noreste de Argentina bajo cargas de larga duración: Deformaciones, recuperación y criterios de diseño

Scaling and modeling the creep of Eucalyptus globulus

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