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Título:
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Strength grading of construction timber with large cross sections
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Autores:
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M.H. KESSEL, Autor ;
PLINKE, B., Autor ;
R. AGUSTIN, Autor ;
M. HUSE, Autor
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Tipo de documento:
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texto impreso
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Fecha de publicación:
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1998
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ISBN/ISSN/DL:
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69186
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Dimensiones:
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pp. 557-562
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Nota general:
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Presentado en: Proceedings of the World Conference on Timber Engineering Vol 1 (1998)
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Langues:
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Inglés
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Clasificación:
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MADERA DE CONSTRUCCIÓN
VIGAS DE MADERA
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Resumen:
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A non-destructive method of grading construction timber beams with cross sections between 10x12cm² and 12x24cm² and lengths from 2.3m to 7.5m was developed. By means of beam geometry, the propagation time of an ultrasound impulse along the beam, longitudinal vibrations and the beam’s mass a prediction of its bending strength MOR and its modulus of elasticity MOE was calculated. The relationships were derived by multivariate regression analysis of data sets of a sample of 450 spruce beams. Since the minimum beam length for bending tests according to EN 408 is given by 19·h, all beams were shortened. During these trials, a dependency of impulse velocity on the beam’s length was observed. Limiting values for strength classes were determined by comparing the predicted MOR and MOE to the measured values.
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