Lateral Bending of Colf formed metal studs Boxed headers
Lateral Bending of Colf formed metal studs Boxed headers
(OP)
Hi everybody,
I was wondering if anybody can point me in the right direction. I am designing some boxed headers and need them taking some lateral loads due to some rather large openings. The typical software we use is the Clark Dietrich's AISIWIN but it doesn't allow the user to do lateral loads. Another problem is that they don't give enough geometric properties for me to input to and run it with Enercalc [as a custom boxed section], STAAD doesn't do cold formed steel boxed sections and their section wizard doesn't let me do a custom section. So i'm out of options, I've tried looking for tables but I haven't been lucky at all. Anybody can point me to a better software or information so I can wrap this up?
I was wondering if anybody can point me in the right direction. I am designing some boxed headers and need them taking some lateral loads due to some rather large openings. The typical software we use is the Clark Dietrich's AISIWIN but it doesn't allow the user to do lateral loads. Another problem is that they don't give enough geometric properties for me to input to and run it with Enercalc [as a custom boxed section], STAAD doesn't do cold formed steel boxed sections and their section wizard doesn't let me do a custom section. So i'm out of options, I've tried looking for tables but I haven't been lucky at all. Anybody can point me to a better software or information so I can wrap this up?






RE: Lateral Bending of Colf formed metal studs Boxed headers
RE: Lateral Bending of Colf formed metal studs Boxed headers
RE: Lateral Bending of Colf formed metal studs Boxed headers
I mean that makes sense but what guarantees composite action between the tracks and how exactly are they typically attached with the C-sections that allows the load to spread between the tracks. I am a bit preoccupied with the torsion, the headers are going to be supporting a canopy connected via the studs on top of the header with a rod.
Most of the information gives talks only about vertical loads but not in conjunction with lateral. I wouldn't be worried if this wasn't a 25 ft long window. I might as well just go for a Hollow section and save me some grief.
RE: Lateral Bending of Colf formed metal studs Boxed headers
I checked out your link, I'm affraid that there isn't really a procedure, or actual formulas for failure in biaxial bending. Unless I do what tolchijb suggested and have them take ea. part of the boxed header a loading condition, but that doesn't guarantee that the section will work as intended unless I do the proper connections.
RE: Lateral Bending of Colf formed metal studs Boxed headers
There is no composite action--the two side members ("studs") resist vertical loads, and the top and bottom members ("tracks") resist lateral loads.
If you really want a composite box member, weld the tracks to the studs.
DaveAtkins
RE: Lateral Bending of Colf formed metal studs Boxed headers
Yeah, with the load delivered like this, I'd think that you'd want to deal with all of the lateral load in the top track(s) alone. Combined Mx + My + T in a cold formed header sounds like an intractable nightmare. Especially since your support connections probably won't be great for torsional restraint. That issue is probably common to the HSS as well, though, unless you go steel posts as well.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Lateral Bending of Colf formed metal studs Boxed headers
RE: Lateral Bending of Colf formed metal studs Boxed headers
I have done this before by adding a bunch of flatwise tracks and flatwise 12ga studs in addition to the vertical studs.
It is usually possible if there is no brick involved and the deflection limits are L/240.
RE: Lateral Bending of Colf formed metal studs Boxed headers
RE: Lateral Bending of Colf formed metal studs Boxed headers
Yeah, I ended up giving up. I went with the HSS, like you guys said, whatever cost in material would have been offset with all the time they would spend putting the header together.
@Stenbrook
I'm going to check the software out, since the Clark western software genuinely confuses me more than it helps me.
Thanks everybody for your advise, btw.