Torsional moment of inertia
Torsional moment of inertia
(OP)
I am having difficulty figuring out how to calculate the torsional moment of inertia of a built up steel member comprised of vertical plates, horizontal plates, and angles?
Can anyone provide any guidance?
Can anyone provide any guidance?






RE: Torsional moment of inertia
RE: Torsional moment of inertia
For a square tube b x h in size with walls of thickness = t, the torsional constant, J = 2(b^2)(h^2)t^2 / (bt + ht)
What does your shape look like?
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: Torsional moment of inertia
I found a post on the STAAD forum that provided the torsional constant of a w-beam. When I tried to verify the Torsional constant with the formula: sum of 1/3*(b)(t)^3, I was able to get the same result when I took "b" as the horizontal length of the flanges and as the vertical length of the web. Is that correct - "b" is the longer dimension of the rectangle regardless of its orientation (vertical or horizontal)?
Thanks again.
RE: Torsional moment of inertia
RE: Torsional moment of inertia
Check out Eng-Tips Forum's Policies here:
FAQ731-376: Eng-Tips.com Forum Policies
RE: Torsional moment of inertia