Published: Jan 1957
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Stress grading of lumber and working stresses for its use in structural design are well known. Most building codes give working stresses for wood. In the development of stress grading, principal emphasis was given to the larger timbers. More recently, increasing attention has been paid to the engineering design of light-frame structures and the strength values in the 2- or 3-in. dimension lumber used for framing. In response to this trend, many of the dimension grades of lumber have been redefined to make them stress grades. At the same time, not all dimension lumber is in stress grades, and engineers have demanded more information on the strength values in such lumber. That demand has led to the studies reported here.
Engineer, U. S. Forest Products Laboratory, Madison, Wis.