Headed Studs Versus Cast in Place Hex Head Bolts

[JoelTXCive]

I need to attach some W12 steel beams to a new concrete wall (minimum 15" thick).

The beams will support self weight and live load of 100psf. On my heaviest loaded beam, this translates into a factored end reaction of 9.5 kips.

I need to design an anchor plate and embedments to deliver this load to the wall.

My question is: Should I use CIP headed studs, or CIP hex head bolts? Which is easier design wise and contractor wise?

I have an older project that my firm did in 2009, and the engineer used headed studs (see below). My beams are W12's not W8, but the setup is the same.

Thank you.

 

[bones206]

Headed stud anchors (Nelson H4L or similar) are pretty common for embed plates. I also tend to use weldable rebar or deformed bar anchors (Nelson D2L) for the top row when needed to help resist the connection eccentricity.

 

[BridgeSmith]

The automatically end-welded studs are the simpler solution, and a very good one, IF you have a fab shop handy with the equipment to weld them. Automatically welding 7/8" studs requires an arc welder capable of generating about 1100 amps. Welding the studs by hand could be done, I suppose, but it's more difficult and likely not nearly as solid of a connection; at that point you'd be better to just use anchor bolts.

 

[dik]

Headed studs are nearly always the best solution... have your plate with stud and a couple of small nail holes and tack them to the form. Pull the form off, clip the protruding nails and done. With headed bolts, you have to drill the form and position the bolt and secure it in place. Then the rest and patch a bigger hole. Contractors don't often want to dill forms.

Dik