steel stair tread embed (it ryhmes)
steel stair tread embed (it ryhmes)
(OP)
thread507-337096: Floating Stair fixing detail
it seems to me that if you got an 8 inch concrete (outside retaining wall say), carve a slot in the form and wet set embed 6.5" a full 10 inch wide (say 1/2" thick) steel stair tread, 300# pt load say at the end of the 3.5' wide stair cantilever, maybe a bolt for "dynamic load" pullout on the inside, whats the problem, why all the rigaremole? must be missing somethin....
it seems to me that if you got an 8 inch concrete (outside retaining wall say), carve a slot in the form and wet set embed 6.5" a full 10 inch wide (say 1/2" thick) steel stair tread, 300# pt load say at the end of the 3.5' wide stair cantilever, maybe a bolt for "dynamic load" pullout on the inside, whats the problem, why all the rigaremole? must be missing somethin....






RE: steel stair tread embed (it ryhmes)
RE: steel stair tread embed (it ryhmes)
If your question is just about embedding then yes you could embed into the wall - assuming the wall can take the moment. Although it seems easier to just embed plates with anchors and then weld the treads to the embed rather than try to prop up all the treads and bury them in the wall prior to the concrete pour.
RE: steel stair tread embed (it ryhmes)
RE: steel stair tread embed (it ryhmes)
I would never wet set treads into a concrete wall...thats just a disaster waiting to happen. I would embed flush plates into the wall and then weld the treads on after. Sometimes field welding is the most economical solution.
RE: steel stair tread embed (it ryhmes)
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: steel stair tread embed (it ryhmes)
You need depth, limitless ways to get it and you probably want input from the architect. I've done lots of these and as canpro said using HSS is typical, you can use T shapes, tapered T shapes, have stiffening lips etc. etc. Flat plate isn't going to work well though.
Figuring out the performance (vibration) is not an incredibly easy task if you really want to get into it properly.
RE: steel stair tread embed (it ryhmes)
RE: steel stair tread embed (it ryhmes)
RE: steel stair tread embed (it ryhmes)
I've run into the open riser issues too. If you're forced to have a riser, it may open up some options. In that situation, I've used flat plate treads and risers perforated with 4" holes to increase openness. If you shear connect the risers to the treads, it's a way to solve your depth problem without increasing tread profile.
While I hate to squelch creative thinking, I also think that the wet set idea is a sketchy one. I suspect that it will be a constructibility nightmare and I'm not at all confident that the treads wont drift around on you. But hey, somebody's got to go first. Prove us wrong and post pictures! You can be the Orville Wright of wet set stair treads.
The greatest trick that bond stress ever pulled was convincing the world it didn't exist.
RE: steel stair tread embed (it ryhmes)
RE: steel stair tread embed (it ryhmes)
RE: steel stair tread embed (it ryhmes)
RE: steel stair tread embed (it ryhmes)
Assuming a 7-8" rise on the stair and an approximate 3-4" tread thickness that leaves about 4" between stairs.