Approximations for column effect in airplane wing spars (1927)
NASA Technical Reports Server (NTRS) · leaf 12
with increased force. The reaction at the middle support is therefore increased and the bending moment must increase in absolute value likewise. The way in which the magnitude of any increase depends on a and on the distribution of the supports of the spar is best shown by tabulation and plotting… … 60° 40° 50° 80° 70° 20° 30° 10° a Fig. 9 Fi gure 9 having shown the variation of the absolute values of the momeiii, Ifigure 10 represents relative variation for ratio of the moments of middle support for various values of a to the corresponding figure with a equal to zero (column effect absent).…
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