Measured and Actual Strength Ratio of Utility Grade Studs

To determine how well strength ratio (SR) predicts stud strength, samples of Douglas-fir and Engelmann spruce studs of Utility grade were measured for their defects and tested destructively. Measured SR’s determined according to ASTM Standard D 245 were statististically compared to actual SRs based on testing. Results showed that the two types of SRs not only came from different populations but were also unrelated. There was no significant relation between actual and corresponding ASTM SRs.

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