PRESTRESSED LAMINATED WOOD BEAMS

摘要

This paper presents acomparative evaluation of the flexural strength of 25 pairs of prestressed and matchingunpre stressed control beams, an evaluation of beams with clear straight-grained tension laminations, and a method of matching pairs of beams of structural size. Results show that an immediate 31 percent increase in strength and approximately 50 percent decrease in variability of strength can be obtained by prestressing, that a clear outer tension lamination probably has more influence upon flexural strength than is recognized by present design methods, and that structural sire beams can be successfully matched.