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A : Gross cross-sectional area of member

Aeff : Effective areac1, c2 : Effective width imperfection adjustment factor determined from Table E7.1

Ncr : the elastic critical force for the relevant buckling mode

E : Modulus of Elastisity,

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Mathinline
body--uriencoded--$$ \normalsize λ%5e- =\frac %7BA_e_f_f f_y %7D%7BN_c_r%7D=\frac %7BL_c_r √\frac %7BA_e_f_f %7D%7BA%7D %7D%7Bi λ_1 %7D$$
for Class 4 cross-sectionsections

Mathinline
body--uriencoded--$$ \normalsize λ_1 =Π√\frac %7BE %7D%7Bf_y%7D =93,9ε$$

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