Δοµική ξυλεία - Προσδιορισµός των χαρακτηριστικών τιµών των µηχανικών ιδιοτήτων και πυκνότητας

This standard gives a method for determining characteristic values of mechanical properties and density, for defined populations of visual grades and/or mechanical strength classes of sawn timber. Additionally it covers the stages of sampling, testing, analysis and presentation of the data. A method is also given for checking the strength of a timber population against its designated value. 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 characteristic values, i.e. bending or tension strength, mean modulus of elasticity parallel to grain in bending or tension and density need to be determined, other properties can be calculated according to Tab. 6.2. NOTE 2 EN 1912 gives examples of established visual grades assigned to strength classes.