Civil Engineering - Steel Structure Design - Discussion

If d/tw≤85.
No stiffeners are required.

If 85≤d/tw≤200.
Vertical stiffeners are required.

If 200≤d/tw≤250
The Vertical stiffener and one horizontal stiffener is provided at a distance of 2/5 from the compression flange to the neutral

If 250≤d/tw≤400.
Plus one horizontal stiffener at neutral.

At support and concentrated load.
Bearing stiffeners are provided under concentrated load to avoid local bending of the flange as well as local buckling of the web.

Horizontal stiffeners are required when the ratio of exceeds 200 i.e. d/t > 200.

* If the ratio is greater than 200 and less the 250 then provide horizontal stiffeners in addition to the vertical stiffener at a distance d/2.

* If d/t > 250 then required a second horizontal stiffener at the neutral axis of the girder.
Acc to this answer should be D. Neither (a) or (b).

Answer is C. Here, they are asking web thickness is less than d/t >250 then additional horizontal stiffener is provided. It can also be written as d/250> t. It means if the thickness of the web is less than d/250. The second horizontal stiffener is provided.

D is the right answer.

The question is asking about 2nd horizontal stiffener, not 1st horizontal stiffener. It's range will 250 - 400.

So. Option D is right.

I think, Both a and b option c correct.

It is not only c and b.

I think Both a & b options are correct!

I think it should be Neither A nor B.

Answer is d/250 for structural steel.

Option D is the correct answer.

I think D is correct answer.