Beam Splice?

[ADAMK2310]

How would you design a splice for cold formed/light guage steel c-studs? The studs do not overlap. They want to use stud material on the backside for the splice plate.

Moment=12k-in
Rafter is 8" CSJ.
How many screws? Screw pattern?

 

[MaddEngineer]

From what I understand there is nothing in the AISI Specification that says that you cannot do what you are proposing. The specification actually notes to see AISC specifications for connections with members 3/16" and thicker, so it seems they recognize AISC connection methods, such as moment splices.

Is it correct that you are splicing members with a 2" flange, remember channel track only has a 1-1/4" flange, not much meat for fasteners.

You might want to also specify PL400 adhesive for extra measure.

I think most are in agreement that from an analysis standpoint it is feasible, but, you need to make it idiot proof and constructable, after all you don't what to be thinking about this job every time it snows or heavy winds are predicted.

You might want to think about specifying sandwiching the web between (2) 6" Scabs (7-1/4" might also work must check lip clearances) or using a 7" web plate with utility angles fastened to the flanges and web.

When you do come up with a solution it would be pretty easy to load test the assembly (this is also recognized by the AISI Specification). Have the contractor set up two members with the plywood deck installed and load it with bricks to at least 2x your calculated moment. If it holds up then you can sleep easy at night.

 

[msquared48]

I can't believe that there are no standard and approved splicing details for PEMB light gage structures for this circumstance. I will have to check.

Mike McCann
MMC Engineering