Civil Engineering - GATE Exam Questions - Discussion

Under higher compression force compared to tension force.

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

@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.

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

Yes, D is correct.

Yes, D is correct.

Option A 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.

I too agree, it is Option D.

I think option A is correct.

yes guys [D] is the correct answer