Log Quality and the Strength and Stiffness of Structural Timber
نویسنده
چکیده
A sample of 78 Pinus radiata D. Don logs was measured and sawn to maximise yields of 100 x 50-mm and 200 x 50-mm timber. The average bending strength and stiffness of the timber were found to depend on the basic density of the log but the lower fifth-percentile strength was more dependent on branch index. For the 28-year-old stand sampled, logs with a low branch index yielded 100 x 50-mm timber of No. 1 Framing grade strength without grading of the timber. When the timber was graded the influence of branch index on strength was reduced but logs with a large branch index yielded graded timber that was below strength.
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