Civil Engineering - UPSC Civil Service Exam Questions - Discussion

Explain this.

I think it will remain unchanged.

@Gaurav.

Yes, it is unaffected.

'A' is the right option.

Option (A) is correct. Since the moment of inertia of middle half is reduced, so the redistribution of moment will occur in such a manner that less strong portion is subjected to less moment to more moment. From this argument, the fixed end moment will increase.

Since the M.O.I of middle half is reduced.

So, the redistribution of the moment will occur in such a manner that LESS STRONG PORTION is subjected to LESS MOMENT and MORE STRONG PORTION is subjected to MORE MOMENT from the thin argument, the FIXED END MOMENT will INCREASE.

So, Option A is Correct.

Option A, Increase is the correct answer.

Option A is correct.

I have calculated the NEW BM at support after a change to be 7PL/48, whereas before change it was PL/8, so the value of BM has increased. I used Unit load method and compatibility conditions.

Dear friends.

I have calculated the bending moment for the beam before the changes and after the changes by the column analogy method and in this method, I have found that in the first case when there is no change in the beam the moment will be PL/8 and in the second case when there is a change in the geometry of beam then its value will be PL/12 so I think option b should be the correct answer. Am I right? Please explain me.