Steel stud curtain wall anchorage design

[CivilSigma]

If you have a light-weight steel stud curtain wall spanning between a portal frame. The studs sit in a track that is fastened into the concrete foundation below. How do you go about designing the stud anchorage into the concrete foundation below?

The wall itself must resist the applied gravity and wind lateral loads.
So, is the anchorage to be specified to resist the lateral shear from wind loads?

What type of anchorage do you usually specify? I'm thinking power actuated nails at 12" on center. I'm just not sure of diameter and nail length.

Thank you.

 

[jayrod12]

That is our standard detail. PAF into the concrete. All other options just take too damn long.

 

[CivilSigma]

When specifying a detail like this, do I have to give the contractor the fastener diameter and length?
Or do I just put "powder actuated fasteners @ 12 o/c" on the drawings?

 

[jayrod12]

Is the steel stud a delegated design item? As in you aren't actually designing and detailing everything?

If yes, then you don't even need to call off a spacing, you just give connection intent, and indicate any restrictions. Otherwise you let the steed stud supplier's engineer figure out the specifics.

If not, then yes you need to give diameter, depth, spacing etc. You need to indicate everything down to the number and size of screws required to connect the studs to the track.

 

[skeletron]

1) Get a handle on what diameter and length to expect for forces.
2) Then call up the contractor and see which one they are using.
3a) If #2 is equivalent to #1, then all is good.
3b) If #2 is substantially different than #1, then try to lead your contractor to the fastener you need.

 

[XR250]

There are tables in typical steel stud manufacturers catalogs that list acceptable capacities of powder actuated fasteners.
Typically, I call out 0.145" Ø PAF with 1" embedment depending on the load.
Be careful about specifying too much embedment as many times it cannot be achieved.
Also be mindful of c/c spacing and also edge distance when applying to 3 5/8" stud walls.

 

[CivilSigma]

I am working on repair of a vehicle impacted curtain wall.

I found HILTI powder actuated fasterns (

https://www.hilti.ca/c/CLS_DIRECT_FASTENING/CLS_GEN_PUR_PAT_NAILS/r6220

)

I think I will specify the above at 1 15/32" length. I checked the product specs and it will provdie adequate lateral shear resistance for the studs. Fasterns placed centrally on 3.5" wide tracks and at 12" on center

 

[XR250]

You should bias them to the interior side of the track for better edge distance. Also, they might not be able to achieve that amount of penetration in old concrete. If there is an option with less embedment, that could cause less headaches.