Full-size beams of southern yellow pine and yellow-poplar were non-des
tructively loaded in flatwise bending, and subsequently notched at the
end and destructively loaded in edgewise bending. Flatwise beam stiff
ness measured before notching was adjusted to its equivalent edgewise
stiffness and compared with experimental results. Limited test results
show that stiffness of end-notched wood beams was influenced by span-
to-depth ratio, fractional notch depth, and notch location. The effect
of end notching on beam stiffness of lumber has not been experimental
ly addressed and previous theoretical analyses did not show a reductio
n.