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UPSC Civil Service Exam Questions - Engineering

Q1:

Which one of the following sections performs better on the ductility criterion ?

A Balanced section

B Over-reinforced section

C Under-reinforced section

D Non-prismatic section

ANS:C - Under-reinforced section

Because We want the steel to yield in a ductile manner when the element is overloaded before the concrete fails in compression. Since the latter will not happen slowly most likely.

If there is too much steel, the concrete would fail rather than the steel yielding.