Specifies a procedure for the classification of timber species into positive or provisional strength groups based on testing of small, clear specimens or on the species mean dry density. When used in conjunction with visual grading rules the strength groups provide a means of determining a stress grade for graded timber. A list of species and their strength groups is given.
Table of contents
Header
About this publication
Preface
1 Scope and general
1.1 Scope
1.2 Referenced documents
1.3 Definitions
2 Procedures for the strength grouping of a species
2.1 General
2.2 Procedure for positive strength grouping
2.2.1 Sampling
2.2.2 Testing
2.2.3 Unseasoned material
2.2.4 Seasoned material
2.2.5 Preliminary comparison based on individual critical properties
2.2.6 Positive strength classification based on the combination of properties
2.2.7 Test report
2.3 Procedure for provisional strength grouping
2.3.1 Data available from mechanical testing
2.3.2 Data available only for seasoned density
2.3.3 Acceptable difference between unseasoned and seasoned strength groups
3 Classification of timbers
3.1 General
3.2 Strength groups of Australian timbers
3.3 Strength groups of timbers other than Australian grown
