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Steel Structure Design

Q1: The rolled steel I-sections are most commonly used as beams because these provide

A large moment of inertia with less cross-sectional area

B large moment of resistance as compared to other section

C greater lateral stability

D all the above.

ANS:D - all the above.

I-Section is preferred to the rectangular section for resisting Bending Moment (BM) because in I-Section more than 80% of the bending moment is resisted by the flanges itself! I-Section has a higher moment of resistance (MoR) because the areas of flanges is away from the neutral axis (N.A).



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