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Consider the following cases in the design of reinforced concrete members in flexure: 1. Over-reinforced section 2. Tension failure 3. Compression failure 4. Under-reinforced section Which of the above cases are considered for safe design of R.C. members in flexure?

Consider the following cases in the design of reinforced concrete members in flexure: 1. Over-reinforced section 2. Tension failure 3. Compression failure 4. Under-reinforced section Which of the above cases are considered for safe design of R.C. members in flexure? Correct Answer 2 and 4 only

Statement I- False; IV- True

In under reinforced sections, Steel is less so it starts to yield first and then cracks starts appearing on concrete and structure fail slowly i.e. ductile failure. It gives us warning and time to escape before collapse any other vulnerable conditions like or earthquake.

On the other hand we provide over reinforced sections, concrete break first and it is brittle failure and structure will collapse instantly. So we have no time to save our life or escape from building before collapse.

 Statement II-True & III-False

The following are the some characteristics of under reinforced section that must be remembered:

1. Steel yield first then concrete.

2. Primarily tension failure

3.  Ductile failure

4.  Larger section is required because it has less steel

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