Civil Engineering - GATE Exam Questions - Discussion

@Sumit Dhyani.

you are partly correct but the answer is still D because;

"Failure takes place by crushing of concrete before the steel has yielded" Although the first part of statement 1 is correct but 2nd part isn't because steel has already yielded far before the ultimate failure due to crushing of concrete.

Regarding Statement 2 it's correct because when steel yields, the bottom part of the beam starts cracking and that area becomes negligible, hence N/A keeps shifting upwards as the cracks propagate higher and higher.

Thus option D is correct.

Yes, option C is correct.

Actually, the in under r/f section, failure is due to concrete. Ya you are confusing with the fact that steel yields earlier than crushing of concrete.

But it doesn't mean that section fails. The section gives us warning due to ductility of steel (when steel yield) and fails due to crushing of concrete.

Any explanation on the second statement. How is it true?

And, yes, the answer should be the one with the statement I false.

Under higher compression force compared to tension force.

Is the neutral axis move above or below the centroidal axis?

I think option is D, 1 st is false. Because under-reinforced itself mean tensile failure i.e. steel will yield first.

In over reinforced section concrete fails first and neutral axis goes down as load is increased answer is B.

Option D is correct.

Member get fails due to yielding of steel in flexural members.

D is the answer.

Steel will yield first.

yes guys [D] is the correct answer

I think option A is correct.