Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Visual grading of large structural coniferous sawn timber according to Spanish Standard UNE 56544
Year:2007
Research Areas
  • Construction materials,
  • Construction of engineering
Information
Abstract
Visual grades of large section structural sawn timber from Spanish coniferous species are studied in-depth in this study. Timber pieces had a cross section from 150 x 200 mm to 200 x 250 mm and were visually graded according to the visual Spanish standard in force, UNE 56544 (2003). The efficacy of this test was analysed. The results according to this visual standard give very low output with an excessive percentage of rejected pieces. Furthermore, visual grading standard does not make it possible to clearly separate the mechanical properties of the different visual grades and rejected pieces. Due to this, modifications are proposed to some of its specifications with the aim of reducing the percentage of rejections and even to stimulate discussion in the Spanish standardization Committee about the creation of a special group of visual grades for timber pieces with thicknesses larger than 70 mm. The physical and mechanical properties (density, bending strength and stiffness) of 395 sawn pieces of radiata pine (Pinus radiata D. Don), redwood pine (Pinus sylvestris L.) and laricio pine (Pinus nigra Arn. ssp. salzmannii) from Spain were estimated using the EN 408 (2003) test standard. Statistical analyses of those properties, demonstrate that special treatment for visually graded large sections is justified and investigations of visual standards from other countries corroborate it. A new visual grade is suggested, MEG (Large Structural Timber), and its mechanical properties and visual specifications are defined.
International
Si
JCR
Si
Title
FOREST PROD J
ISBN
0015-7473
Impact factor JCR
0,351
Impact info
Volume
57
Journal number
10
From page
45
To page
50
Month
SIN MES
Ranking
Participants
  • Participante: David Barrett (British Columbia University)
  • Autor: Guillermo Iñiguez Gonzalez (UPM)
  • Autor: Francisco Arriaga Martitegui (UPM)
  • Autor: Miguel Esteban Herrero (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Construcción con Madera
  • Departamento: Construcción y Vías Rurales
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