self-tapping screws in composite section
self-tapping screws in composite section
(OP)
Can anyone direct me to a website containing shear capacities of self-tapping screws for a shear load ±13kips (58KN) joining a 12Ga with 1/8 steel plate?
Second question: if I were to use these screws as a means for fastening rather than welding for full composite action shear connection resistance, Qr, does anyone think it's a poor design. It's just that screwing two light gage steel is quicker and more economical than welding... but, it strength is obviously shortcoming.
Second question: if I were to use these screws as a means for fastening rather than welding for full composite action shear connection resistance, Qr, does anyone think it's a poor design. It's just that screwing two light gage steel is quicker and more economical than welding... but, it strength is obviously shortcoming.






RE: self-tapping screws in composite section
For the spacing of the screws you can check in section D of the 2001 AISI North American Cold-Formed Steel Specification. You can check for smax, screw or weld spacing, in that section. I typically use 12" o.c. and that almost always works. I don't often actually have to have the full composite action however. You must have some enormous loads, or torsion perhaps.
RE: self-tapping screws in composite section
RE: self-tapping screws in composite section
This sounds like a very bad idea. I work in the UK and under our codes this would not be allowed - there is a requirement for the studs to protrude above the deck profile so that they tie into the mesh reinforced concrete.
Hilti do produce a shot fired component to replace the welded studs. I don't have the info to hand but confirm that I've seen it on site and it seems to work well.
RE: self-tapping screws in composite section
Nevertheless, what would you say to replace these screws with (2)-5/8"diam (A325) bolts to tie together two plates 12Ga-3/16"?
If you would like to see our floor system (composite joists) go to www.cfloor.ca
RE: self-tapping screws in composite section
RE: self-tapping screws in composite section