Four Douglas fir boards each have a cross section 25 mm by 125 mm and a length of 7.5 m. They are glued together to form a column with a hollow box cross section of outer dimensions 150 mm by 150 mm. The lower end of the column is clamped and the upper end is pinned.
a. Determine the critical buckling load for the column.
b. Determine the minimum proportional limit stress for the Douglas fir for the use of Euler's equation to be justified.
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