The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods

A group of databases making a total of approximately 9300 sawn timber pieces from Spanish coniferous species, tested according to European standards and visually graded mainly according Spanish standards were analyzed. The percentiles ratio 20th/5th of bending strength, modulus of elasticity and den...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Nevado,Miguel A. Rz, Arriaga,Francisco, Díez,Rafael
Lenguaje:	English
Publicado:	Universidad del Bío-Bío 2015
Materias:	Timber characterization fire situation structural reliability reference material properties
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2015000400003
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:scielo:S0718-221X2015000400003
record_format	dspace
spelling	oai:scielo:S0718-221X20150004000032016-10-25The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoodsNevado,Miguel A. RzArriaga,FranciscoDíez,Rafael Timber characterization fire situation structural reliability reference material properties A group of databases making a total of approximately 9300 sawn timber pieces from Spanish coniferous species, tested according to European standards and visually graded mainly according Spanish standards were analyzed. The percentiles ratio 20th/5th of bending strength, modulus of elasticity and density distribution were obtained for different combinations of species and visual stress grade. The Eurocode 5 proposes this percentile ratio by a coefficient k fi which is used to determine the design values of mechanical properties in fire situation. The percentile ratios obtained were compared with the specified value in Eurocode 5 for solid timber (k fi = 1,25). In lower grades of Spanish coniferous timber, this value was overly conservative. A value of k fi of 1,4 seems to be more adequate for the case of the bending modulus of elasticity and 1,4 to 1,5 for the bending strength. It is noted that, in the case of the upper grades, this value should be of 1,3; close to the Eurocode proposal. Furthermore, in the case of density, the value should be of 1,1; hence lower than suggested in the code.info:eu-repo/semantics/openAccessUniversidad del Bío-BíoMaderas. Ciencia y tecnología v.17 n.4 20152015-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2015000400003en10.4067/S0718-221X2015005000063
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Timber characterization fire situation structural reliability reference material properties
spellingShingle	Timber characterization fire situation structural reliability reference material properties Nevado,Miguel A. Rz Arriaga,Francisco Díez,Rafael The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods
description	A group of databases making a total of approximately 9300 sawn timber pieces from Spanish coniferous species, tested according to European standards and visually graded mainly according Spanish standards were analyzed. The percentiles ratio 20th/5th of bending strength, modulus of elasticity and density distribution were obtained for different combinations of species and visual stress grade. The Eurocode 5 proposes this percentile ratio by a coefficient k fi which is used to determine the design values of mechanical properties in fire situation. The percentile ratios obtained were compared with the specified value in Eurocode 5 for solid timber (k fi = 1,25). In lower grades of Spanish coniferous timber, this value was overly conservative. A value of k fi of 1,4 seems to be more adequate for the case of the bending modulus of elasticity and 1,4 to 1,5 for the bending strength. It is noted that, in the case of the upper grades, this value should be of 1,3; close to the Eurocode proposal. Furthermore, in the case of density, the value should be of 1,1; hence lower than suggested in the code.
author	Nevado,Miguel A. Rz Arriaga,Francisco Díez,Rafael
author_facet	Nevado,Miguel A. Rz Arriaga,Francisco Díez,Rafael
author_sort	Nevado,Miguel A. Rz
title	The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods
title_short	The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods
title_full	The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods
title_fullStr	The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods
title_full_unstemmed	The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods
title_sort	percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods
publisher	Universidad del Bío-Bío
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2015000400003
work_keys_str_mv	AT nevadomiguelarz thepercentilesratio20thto5thofbendingstrengthandstiffnessdistributioninthecaseofspanishsoftwoods AT arriagafrancisco thepercentilesratio20thto5thofbendingstrengthandstiffnessdistributioninthecaseofspanishsoftwoods AT diezrafael thepercentilesratio20thto5thofbendingstrengthandstiffnessdistributioninthecaseofspanishsoftwoods AT nevadomiguelarz percentilesratio20thto5thofbendingstrengthandstiffnessdistributioninthecaseofspanishsoftwoods AT arriagafrancisco percentilesratio20thto5thofbendingstrengthandstiffnessdistributioninthecaseofspanishsoftwoods AT diezrafael percentilesratio20thto5thofbendingstrengthandstiffnessdistributioninthecaseofspanishsoftwoods
_version_	1714202606138556416

The percentiles ratio 20th to 5th of bending strength and stiffness distribution in the case of spanish softwoods

Ejemplares similares