CFS Bottom Track Cantilevered Overturning check 2

[Revv]

Hey guys,

So I am doing a cfs parapet wall that will be held down by 2 rows of screws to resist overturning. When checking this connection, how should I go about ensuring my track works in bending, what checks would you do?

Thank you!

 

[Celt83]

AISI governs the design, you’d be putting the track into combined shear, bending, and torsion the calcs are pretty tedious and you’ll likely find it doesn’t work. Would suggest looking into the SteelNetwork StiffClip CL or sim from a competitor. If you have nothing to anchor down to with the CL then either kick the parapet, cantilever studs up, or introduce steel stub ups.

 

[Revv]

@celt83

Thank you for the response, when you say cantilever your studs up, what do you mean exactly? That's what I was intending to do with my original question but we may not be picturing the same thing

Thanks

 

[DaveAtkins]

Celt83 is correct when it comes to knee walls which have a window above - for these you require a special clip which has moment capacity.

For a parapet, you MIGHT be able to make it work. The moment at the base of the stud can be resolved into a couple, with one force pulling up on a track flange, and the other force pushing down on the opposite track flange. The force pulling up will cause bending in the track web at the location of the fastener. The tricky part is deciding what effective width of web to use. I follow an article from AISC Engineering Journal, Second Quarter 2013, entitled "Flange Bending in Single Curvature." It is really about monorail crane support beams, but I think the logic applies to this situation as well.

DaveAtkins

 

[Revv]

@daveatkins thank you for the response, do you happen to know if that document has to be paid for everywhere or if it's been posted for free? I couldn't seem to find the full document without having to purchase but if that's the case then that's the case.

 

[KootK]

So I am doing a cfs parapet wall that will be held down by 2 rows of screws to resist overturning. When checking this connection, how should I go about ensuring my track works in bending, what checks would you do?

What are we fastening to? Plywood? Metal deck?

How tall is your parapet?

In my neck of the woods, folks don't bother checking this if the parapet is less than 2' tall. Market practice is what it is. No doubt it does not work by the numbers. Much higher than 2', and I'm usually looking for a different solution altogether.