Civil Engineering - Steel Structure Design - Discussion

According to IS 800-1994,
Vertical stiffened d/200 should not less than but according to IS 800-71 it's d/250.

D is the correct answer. Because. They asking only about vertical stiffner they didn't mention whether there is need of hzt stiffner or not.

So, We can take a minimum value.

D/t=250.
T= D * 0.004.

Opt A is correct. As per code when d/t is >85 V.S are used upto 200. If d/t is > 200 HS are used.

According to me , when the d/t is less than 85 then vertically stiffened are not provided but if the value is in between 85 -200 vertically stiffened are provided so the ans is A

If the denominator factor is big, the thickness will be small. So if the denominator increases up to 200 thickness decreases to a minimum.

So, answer B. If vertically stiffened assumed. But I think it takes 250 because it hasn't differentiated between horizontal and vertical stiffener.

The right answer should be option A.

It's 180 or section will fail in shear before bucking.

The answer is fine if you consider the following case as vertical stiffened web plate.

Here min web thickness is concerned so d/250 is the correct answer.

Vertical +1horizontal stiffeners are provided if the web is more than d/200 but less than d/250 (in this case this 1 horizontal stiffener is usual to place at 2/5th of the depth of neutral axis from the compression flange).

B is correct.

No stiffeners are provided if the web is more than d/85.

Vertical stiffeners are provided if the web is less than d/85 but more than d/200.

Vertical +1horizontal stiffeners are provided if the web is more than d/200 but less than d/250 (in this case this 1 horizontal stiffener is usual to place at 2/5th of the depth of neutral axis from the compression flange).

Vertical +2 horizontal stiffeners are provided if the web is less than d/250 (in this case this 2nd horizontal stiffener is usually placed at neutral axis).

Yes, right @Pankaj.