Beam Loading Help
Beam Loading Help
(OP)
I haven't done this in years so I am hoping someone will refresh my memory. I need to find the maximum weight that can be handled safely on structural tubing (ANSI A500) class B - 2 x 2 x 16 ga wall. The weight will be uniformly distributed along a 48" span. The supports will be fixed at either end. I know this seems simple but I just want to make sure I am doing this correctly. Thanks in Advance






RE: Beam Loading Help
1) Determine Sx of your section.
2) Determine allowable stress (fy) of steel. Normally .66 Fy therfore you have (0.66 X 50)=33 ksi.
3) Determine allowable moment of your section.
Mmax= Fa (in psi) * sx (in in 3)/ 12
4) Mmax= w* l * l/8
where l is your span (4'-0). This will give you in pounds per foot.
Hope this helps.
Geoff
RE: Beam Loading Help
RE: Beam Loading Help
RE: Beam Loading Help
The maximum moment for the fix-fix condition (which occurs at the ends) is =wL^2/12 (not wL^2/8).
I prefer LRFD method instead of ASD, so I would take .9(Fy)Sx for the nominal moment allowed and compare it to factored max moment. Then solve for Sx. This only works if the section compact, and I think in your case, 48" is too long and the walls are too thin, therefore the section is probably non-compact.
RE: Beam Loading Help