What metal deck connections do you use for K joist? 2

[reverbz]

Hey Guys,

What typical metal deck connections do you use for K-joist? I haven't worked with these before.

also bonus question if you're feeling generous: How do you detail mechanical openings? Angles to girder joists? How do you fasten them?

Thank you!

 

[DaveAtkins]

Early in my career (almost 40 years ago), I think they were called POWDER driven fasteners, because I believe there was gunpowder involved.

 

[DaveAtkins]

I just checked online - I guess gunpowder driven pins are still an option! Sounds dangerous to me

 

[bones206]

One caveat is if you need a special seismic bare deck diaphragm per AISI S400 F3.5, arc spot welds are not allowed due to lack of ductility. This might come into play if you are doing a big box or tilt up in a seismic area and using the roof diaphragm as the inelastic energy dissipation mechanism. So called Rigid Wall Flexible Diaphragm (RWFD) buildings have an new alternate procedure in ASCE 22 that takes this approach to seismic design, based on the latest research.

 

[ANE91]

I just checked online - I guess gunpowder driven pins are still an option! Sounds dangerous to me

Yep! Same powder, but there's an intermediate piston that does the actual "driving." If you were to somehow trick the tool into activating into the open air, which it can't normally do, then the pin would simply drop to the ground rather than accelerate like a bullet. Hence, they're called "low velocity driving" tools, or something like that.