Question

Which section is good from ductility point of view?

• A. Under reinforced section
• B. Balanced section
• C. Over reinforced section
• D. Section with special steel

Hint:

Failure modes of RC sections: \[ \boxed{ \begin{aligned} \text{Under reinforced} &\rightarrow \text{Ductile (Preferred)}\\ \text{Balanced} &\rightarrow \text{Simultaneous failure}\\ \text{Over reinforced} &\rightarrow \text{Brittle (Not preferred)} \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Recall the behavior of reinforced concrete sections. An under reinforced section is designed so that the steel yields before the concrete crushes.

Step 2: State why it is preferred. Yielding of steel gives large deflections and visible cracks before failure, providing sufficient warning and ensuring ductile behavior. Hence, \[ \boxed{\text{Under reinforced section}} \] is the correct answer. Therefore, \[ \boxed{(A)} \] is the correct answer.