Doweling equipment pad into existing slab - development length?
Doweling equipment pad into existing slab - development length?
(OP)
We're doweling new 4" thick equipment pads into an existing concrete foundation slab. The dowels are #4 reinforcement that I equate to a 90° hook. I assume the horizontal portion of the #4 dowel is ldh as defined in ACI 318 fig. R12.5. My question is the necessary length of the vertical portion of the hook. Is it correct to assume the minimum embedment in the existing foundation is 12*db or is some of this 12*db allowed to be in the new pad itself thereby lowering the necessary embedment depth? We plan to specify Hilti HY-200 adhesive.






RE: Doweling equipment pad into existing slab - development length?
If not, you're only transferring shear and it's really there just to keep everything together. I wouldn't worry about developing the bars.
RE: Doweling equipment pad into existing slab - development length?
how do you determine when doweling to existing foundation if you will just design for shear or you need to design for moment (full development length)?
RE: Doweling equipment pad into existing slab - development length?
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: Doweling equipment pad into existing slab - development length?
That being said, the bar probably doesn't need to be developed.
I would embed it into the existing foundation slab the distance recommended by Hilti.
DaveAtkins
RE: Doweling equipment pad into existing slab - development length?
This is not typical.
My guess is you just have some piece of equipment that needs a pad so that it sits elevated from the slab. In that case the dowels are there just to tie it all together.
RE: Doweling equipment pad into existing slab - development length?
http://www.eng-tips.com/search.cfm?q=equipment%20p...
RE: Doweling equipment pad into existing slab - development length?
KootK: You are correct.
RE: Doweling equipment pad into existing slab - development length?