Development of Standardized Concepts for Assignment and Assessment of the Mechanical Properties of Lumber–A Continuing Challenge for the 1980’S

During the first half of the twentieth century, research on the mechanical properties of lumber emphasized the cataloging of species properties and the development of structural grading principles. As we move into the latter decades of this century, property assignment procedures must reflect the potentially conflicting concerns for improved design efficiency and increased vulnerability to product liability. Recently developed sampling procedures and test methods appear increasingly “use oriented.” However, before we can implement lumber properties generated from use of these recent methods we must decide how best to estimate lower tail properties, devise procedures for acceptance or rejection of new data, and deal with outlying observations. In addition, there is a need for performance oriented standards that reflect “real” world needs. All of these concerns have both a technical interest and a significant impact on commerce. Suggested procedures and decisionmaking dilemmas are reviewed.

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