Equations are presented for critical buckling load of column, fixed at its base and loaded at its upper end, under variety of conditions; case of column loaded at its upper end through frictionless roller; column loaded at its upper end through pinned link; latter case is developed and expanded for comparison with similar case of loading through roller; equations are derived for columns of lift-slab operation, loaded by hanging links.
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Donald A. Sawyer (1960) studied this question.
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