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For calculating the permissible stress 0 y /[(1 + a(l/r)²] is the empirical formula, known as__________________?

/ Theory of Structures / By
For calculating the permissible stress 0 y /[(1 + a(l/r)²] is the empirical formula, known as__________________?

A. Straight line formula
B. Parabolic formula
C. Perry’s formula
D. Rankine’s formula