Down turned slab
Down turned slab
(OP)
Guys,
I'm trying to use a downturned slab edge to support a kneewall and glazing. I'm considering the linear reaction from the glazing (negative wind load) to cause a point load at the top of my kneewall, which in turn creates outward shear and overturning about the outer edge of my down turned slab. I don't have enough concrete in my footing to counteract the overturn. Can I use my slab reinforcing, hooked into the thickened edge of the slab, as a tie to counter the overturning? Basically like a tie-rod.
I'm trying to use a downturned slab edge to support a kneewall and glazing. I'm considering the linear reaction from the glazing (negative wind load) to cause a point load at the top of my kneewall, which in turn creates outward shear and overturning about the outer edge of my down turned slab. I don't have enough concrete in my footing to counteract the overturn. Can I use my slab reinforcing, hooked into the thickened edge of the slab, as a tie to counter the overturning? Basically like a tie-rod.






RE: Down turned slab
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Down turned slab
Are you familiar with Alexander Newman's Foundation and Anchor Design Guide for Metal Building Systems? I've read this text and questions like the one I have above aren't completely addressed.
Where can I find a finite answer on this sort of question?
RE: Down turned slab
RE: Down turned slab
I own a copy but confess that I've done nothing with it to date other than flip through it casually.
I doubt that you'll find it anywhere. Structural engineers are smart cookies. Too smart to attach their names, in print, to a sketchy detail like this.
If you turn the detail on its side for the critical opening moment case, you'll find that it quite resembles a retaining wall. And that ought to inform our detailing I think. Of course, you'll have closing moments as well and probably a 6" knee wall with only room for a single curtain of rebar. C'est la vie.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Down turned slab
They build 3 story apartments here on TD slabs - aahhh!
RE: Down turned slab
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.