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Steel Structure Design - Engineering

Q1:

The minimum width B of a solid casing for a cased beam, is equal to

A B = b + 25 mm

B B = b + 50 mm

C B = b + 75 mm

D B = b + 100 mm

E B = b + 125 mm

ANS:D - B = b + 100 mm

I think the Cased beam is a combination of steel structural beam then encased with reinforced concrete. The minimum width B is the width of steel section flange plus 100mm.