y/n) (1 – a l/r), is For calculating the allowable stress of long columns. The empirical formula 0 known as_________________?

y/n) (1 – a l/r), is For calculating the allowable stress of long co

1.	y/n) (1 – a l/r), is For calculating the allowable stress of long columns. The empirical formula 0 known as_________________?
A.	Straight line formula
B.	Parabolic formula
C.	Perry’s formula
D.	Rankine’s formula
Answer» B. Parabolic formula

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y/n) (1 – a l/r), is For calculating the allowable stress of long columns. The empirical formula 0 known as_________________?

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