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Second moment of area of the web about the NA, Ief:

Second moment of area of the top flange about the NA, /ef.f.t f bef.c ■ hf r

Second moment of area of the bottom flange about the NA,

5 m4

hbf 2

Instantaneous second moment Ief = Ief w + /ef.f.t f + Zef.f.b.f Ief = 1-49 x 108 mm4 of area the transformed section, Ief

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