This European Standard gives a method for determining characteristic values of mechanical properties and density, for defined populations of visual grades and/or strength classes of machine graded structural timber. Additionally it covers the stages of sampling, testing, analysis and presentation of the data. The standard provides methods to derive strength, stiffness and density properties for structural timber from tests with defect-free specimen. The values determined in accordance with this standard for mechanical properties and density are suitable for assigning grades and species to the strength classes of EN 338. NOTE 1 For assigning grades and species to the strength classes in EN 338 only three properties, i.e. bending or tension strength, modulus of elasticity parallel to grain in bending or tension and density need to be determined from test data, other properties can be calculated according to Table 2. NOTE 2 EN 1912 gives examples of established visual grades assigned to strength classes.
EN 384:2016 Referenced Document
EN 13183-2:2002 Moisture content of a piece of sawn timber - Part 2: Estimation by electrical resistance method
EN 13183-3:2005 Moisture content of a piece of sawn timber - Part 3: Estimation by capacitance method
EN 14081-1:2016 Timber structures - Strength graded structural timber with rectangular cross section - Part 1: General requirements
EN 14081-3:2012 Timber structures - Strength graded structural timber with rectangular cross section - Part 3: Machine grading; additional requirements for factory production control
EN 14358:2016 Timber structures - Calculation and verification of characteristic values
EN 1912:2012 Structural Timber - Strength classes - Assignment of visual grades and species (Incorporating corrigendum August 2013)