EN 384:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.JRVWRWHBauholz für tragende Zwecke - Bestimmung charakteristischer Werte für mechanische Eigenschaften und RohdichteBois de structure - Détermination des valeurs caractéristiques des propriétés mécaniques et de la masse volumiqueStructural timber - Determination of characteristic values of mechanical properties and density91.080.20Lesene konstrukcijeTimber structuresICS:Ta slovenski standard je istoveten z:EN 384:2004SIST EN 384:2004en01-september-2004SIST EN 384:2004SLOVENSKI
STANDARDSIST EN 384:19961DGRPHãþD

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 384January 2004ICS 79.040Supersedes EN 384:1995English versionStructural timber - Determination of characteristic values ofmechanical properties and densityBois de structure - Détermination des valeurscaractéristiques des propriétés mécaniques et de la massevolumiqueBauholz für tragende Zwecke - Bestimmungcharakteristischer Werte für mechanische Eigenschaftenund RohdichteThis European Standard was approved by CEN on 20 February 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 384:2004: ESIST EN 384:2004

....................................................................................................................................................14Annex A Bibliography......................................................................................................................................14Annex B (informative)
Sample form containing characteristic values.15SIST EN 384:2004

af
distance between the inner load points of the bending test (in mm)
E
mean modulus of elasticity for one sample (in N/mm2)
E0,mean
mean characteristic value of modulus of elasticity parallel to grain (in N/mm2)
E0,05
5-percentile characteristic value of modulus of elasticity parallel to grain (in N/mm2)
E90,mean
mean characteristic value of modulus of elasticity perpendicular to grain (in N/mm2)
fstrength property
fc,0,k
characteristic value of compression strength parallel to grain (in N/mm2)
fc,90,k
characteristic value of compression strength perpendicular to grain (in N/mm2)
fk
characteristic value of strength (in N/mm2)
fm,k
characteristic value of bending strength (in N/mm2)
fmean
sample mean value of strength (in N/mm2)
fr
5-percentile ranked test value (in N/mm2)
ft,0,k
characteristic value of tensile strength parallel to grain (in N/mm2)
ft,90,k
characteristic value of tensile strength perpendicular to grain (in N/mm2)
f05
5-percentile value for each sample (in N/mm2)
f05
the mean value of f05 for several samples
(in N/mm2)
fv,k
characteristic value of shear strength (in N/mm2)
Gmean
mean characteristic value of shear modulus (in N/mm2)
h
depth of a bending specimen or width of a tension specimen (in mm)
kg
factor used for determining characteristic values of tension and compression parallel to grain and shear
kh
factor for adjusting fk when h is different from 150 mm
kl
factor for adjusting length;SIST EN 384:2004

kn
factor for obtaining characteristic value from mean value;
kq
factor for use when checking the quality of a graded sample
ks
factor for adjusting number and size of samples
kv
factor for adjusting machine grading
span (in mm)
es
effective length for the standard test procedure (in mm)
et
effective length for the test (in mm)
n
number of specimens in a sample
s
standard deviation
rsample mean value of density (in N/mm2)
r
density (in kg/m3)
rk
characteristic density (5-percentile) (in kg/m3)
r05
5-percentile density for a sample (in kg/m3)5 Mechanical properties determined from full-size specimens5.1SamplingSamples shall be selected from the population of timber graded visually or by machine to the requirements given inprEN 14081-1. The population shall be capable of being identified at all stages of production and supply, includingthe construction site.The test material shall be representative of the population. The timber shall represent the timber source, sizes, andquality that will be graded in production. Each sample shall be from one source.NOTE 1Any known or suspected difference in the mechanical properties of the population distribution due to growth regions,sawmills, tree size or method of conversion should be represented within the number of samples selected, by a similarproportion to their frequency in the population. This should be the major influence in determining the number and size ofsamples.The number of specimens in each sample shall be not less than 40.NOTE 2Where samples are small and/or few in number the characteristic values will be penalized, see 5.4.The cross section size of specimens shall be the same within a sample, but different for other samples, reflectingthe range of sizes to which the grading rules are applicable. However, if the size effect for the grad
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