For calculating the allowable stress of long columns σ0 = σy/n [1 - a (1/r)²]is the empirical formula, known as

For calculating the allowable stress of long columns σ0 = σy/n [1 -

1.	For calculating the allowable stress of long columns σ0 = σy/n [1 - a (1/r)²]is the empirical formula, known as
A.	Straight line formula
B.	Parabolic formula
C.	Perry
D.	Rankine
Answer» C. Perry

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For calculating the allowable stress of long columns σ0 = σy/n [1 - a (1/r)²]is the empirical formula, known as

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