ASTM D2555-17a(2024)e1

Kategorie - podobné normy:

Dřevo. Kulatina na řezivo. Řezivo

Anotace textu normy ASTM D2555-17a(2024)e1 :

This practice presents the two standard methods for determining the strength values of clear wood of different species in the unseasoned condition, unadjusted for end use, applicable to the establishment of working stresses for different solid wood products such as lumber, laminated wood, plywood, and round timbers. Method A provides for the use of the results of surveys of wood density involving extensive sampling of forest trees, in combination with the data obtained from standard strength tests. The average strength properties are obtained from wood density survey data through linear regression equations establishing the relation of specific gravity to the several strength properties. Method B, on the other hand, provides for the establishment of tables of strength values based on standard tests of small clear specimens in the unseasoned condition for use when data from density surveys are not available. Separate tables are employed to present the data on woods grown in the United States and on woods grown in Canada. Guidelines for the interpretation of the data in terms of assigned values, information basic to the translation of the clear wood values into working stresses, presently available data with appropriate provisions for their application and use, and methods for estimating some useful mechanical properties by relating them to other properties are presented herein as well.

Keywords:

clear wood, density survey, laminated wood, lumber modulus of elasticity, plywood, round timber, species combinations, specific gravity, strength properties, timber volumes, variability,, ICS Number Code 79.040 (Wood, sawlogs and sawn timber)