## section modulus for I or WF-beam?

## section modulus for I or WF-beam?

(OP)

Please help, I don't have the AISC Manual, and Googling this brought up conflicting formulae.

All I need is the formula for Section Modulus, expressed in AISC terms or any generic terms for an I or WF-section. I don't need the expression for that small area included in the fillet radius (flange to web)

Thanks in advance!

All I need is the formula for Section Modulus, expressed in AISC terms or any generic terms for an I or WF-section. I don't need the expression for that small area included in the fillet radius (flange to web)

Thanks in advance!

## RE: section modulus for I or WF-beam?

## RE: section modulus for I or WF-beam?

This assumes square cornered web and flanges. D is the overall height. B is the flange width. Tf is the flange thickness. Tw is the web thickness.

Please be sure to verify this agains a known shape.

## RE: section modulus for I or WF-beam?

## RE: section modulus for I or WF-beam?

http://www

## RE: section modulus for I or WF-beam?

I think that only works if I am looking for the Section Modulus of the flanges only (as if the flanges were effective, but the web was left out of the calculation) - it is pretty close, a bit conservative.

## RE: section modulus for I or WF-beam?

## RE: section modulus for I or WF-beam?

## RE: section modulus for I or WF-beam?

I = Iflanges + Iweb + Af(df)2

c = centroid

simple as that

RC

All that is necessary for the triumph of evil is that good men do nothing.

Edmund Burke

## RE: section modulus for I or WF-beam?

If you don't know the exact moment of inertia of the wide flange, you should be able to approximate it as three rectangles, conservatively neglecting fillets.

btw.. that's not an AISC provision, it's a mechanics of solids concept.. back to basics!

## RE: section modulus for I or WF-beam?

S = [(B/12)x D^3-((B-Tw)/12)x(D-2xTf)^3]/(D/2)

## RE: section modulus for I or WF-beam?