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Steel Structure Design - Engineering

Q1:

The average shear stress for rolled steel beam section, is

A 845 kg/cm2

B 945 kg/cm2

C 1025 kg/cm2

D 1500 kg/cm2

E 1875 kg/cm2

ANS:B - 945 kg/cm2

How can we take fy is 240mpa?

Here, They don't mention thickness. Anyone explain this.