COPARISON OF RANKINE AND GORDAN FORMULAE:
A comparison of the Rankine-Gordon and Euler formulae, for geometrically perfect struts, is given in Fig 1. Some typical values for 1/a and , are given in Table 1. Where Lo is the effective length of the strut; see next Section.
Fig 1:Comparison of Euler and Rankine-Gordon formulae
Table 1 Rankine Constants
EFFECT OF GEOMETRICAL IMPERFACTIONS:
For intermediate struts with geometrical imperfections, the buckling load is further decreased, as shown in Fig 2.
Fig 2: Rankin gordon loads for perfect and imperfect struts