Newlin, J A Trayer, G W
naca-report-188
1925
The general purpose in this study was to determine the stresses in a wooden member subjected to combined beam and column action. What may be considered the specific purpose, as it relates more directly to the problem of design, was to determine the particular stress that obtains at maximum load which, for combined loading, does not occur simultaneously with maximum stress.
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http://naca.central.cranfield.ac.uk/reports/1925/naca-report-188.pdf