The Establishment of Working Stresses for Groups of Species

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Pearson, R.G.



40 p.

A study of the results of bending tests on structural sizes of timber of 16 local and overseas species led to the recommendation that modulus of elasticity should vary with the grade of material. Despite apparent wide variations between individual species in the relation between modulus of elasticity and modulus of rupture for structural sizes of timber, a general relation derived from standard tests on small, clear, unseasoned specimens gave a satisfactory fit to the results for all species taken together, and for most individual species, irrespective of moisture condition. The system of strength grouping adopted in Australia for coping with the numerous species used structurally has been critically examined, and changes have been proposed. Procedures for determining the strength group limits and working stresses, and considerations involved in grouping species are discussed. The proposed system is simple, flexible, and comprehensive. A small set of working stresses in geometric series is adequate for a wide range of species and grades of material as well as for different moisture conditions and durations of load.



CSIRO. Division of Forest Products; Division of Forest Products Technological Paper; Forestry and Forest Products

This report has been placed on the CSIRO repository and may be made available to persons outside of CSIRO for non commercial purposes, in its entirety and without deletion of disclaimers and copyright information.

Published Version (pdf) (38.78MB)

Division of Forest Products Technological Paper

no. 35



Pearson, R.G. The Establishment of Working Stresses for Groups of Species . Melbourne: CSIRO; 1965.

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