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.

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.

The right answer should be option A.

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).

d/t<85 no stiffener.

d/t 85-200 vertical stiffener.

d/t 200-250 vertical stiffener and 1 horizontal stiffener.

Yes, A is the right answer.

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.

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.

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