Questions on AISC F4 and F5
Questions on AISC F4 and F5
(OP)
I have a few questions on AISC spec section F4 (which also has some overlap with F5).
What exactly is hc? I can't find this defined anywhere and I'm assuming that it's the portion of the web that is in compression in the elastic stress range.
Has anyone else had to use these provisions? The equations seem very long and tedious. I'm making a spreadsheet because I know that the architect will want to play with sizes and I'm not spending days re-calc'ing all these properties for built-up sections.
What exactly is hc? I can't find this defined anywhere and I'm assuming that it's the portion of the web that is in compression in the elastic stress range.
Has anyone else had to use these provisions? The equations seem very long and tedious. I'm making a spreadsheet because I know that the architect will want to play with sizes and I'm not spending days re-calc'ing all these properties for built-up sections.






RE: Questions on AISC F4 and F5
RE: Questions on AISC F4 and F5
RE: Questions on AISC F4 and F5
I do a lot of metal bldg consulting and use these ad nauseam. Yes, F4 is insane and spreadsheets or programs are mandatory.
What's REALLY funny is what happens to Eq. F4-8 if Iyc/Iy<=0.23!! Check it out!
RE: Questions on AISC F4 and F5
RE: Questions on AISC F4 and F5
RE: Questions on AISC F4 and F5
StrlEIT, it is simply a mistake. If the sqrt(J/Sxc*ho) is "unfactored-out" then the Jin teh denominator goes away. The next version of the Spec. will have this modified form of Eq. F4-8.