Rebar dowels driven into concrete
Rebar dowels driven into concrete
(OP)
Hi all,
Has anyone ever heard of rebar dowels being installed by pounding them into a pre-drilled hole? Apparently this happens in precast tilt-up construction for the dowels at the base of the wall panels.
Has anyone ever heard of rebar dowels being installed by pounding them into a pre-drilled hole? Apparently this happens in precast tilt-up construction for the dowels at the base of the wall panels.






RE: Rebar dowels driven into concrete
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
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RE: Rebar dowels driven into concrete
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RE: Rebar dowels driven into concrete
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: Rebar dowels driven into concrete
Not sure I'd depend on this for any seismic loading...just my view.
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RE: Rebar dowels driven into concrete
That's as expected though isn't it? It's a rare anchorage situation where one is able to shear yield the steel anchor before all of the terrible app D stuff happens.
And I sympathize with that view. I wouldn't use the detail myself if I wasn't forced to my the behavior of my competitors. It gets worse too. I'm a precaster's engineer a day or two each week now so I see a lot of this detail by other EOR's. The spancrete testing was based on a very specific geometry with respect to edge distances etc. Most everybody applies the detail with much worse geometry. 2" edge distances, 0" edge distances... And my friends on the erection crews tell me that the driven dowels just end up spalling the plank apart in many cases and, thus, are even more worthless than they seem on paper. The next time that the New Madrid fault acts up, one of the first things that will happens is that 1/2 the basements in the Midwest will collapse inwards.
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: Rebar dowels driven into concrete
Hah, you've been absorbed as well. [Precast engineers fist-bump]
Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries
https://www.facebook.com/AmericanConcrete/
RE: Rebar dowels driven into concrete
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: Rebar dowels driven into concrete
This doesn't happen to be in a seismic/high wind area so I can see how the practice persists for precast wall panels. Unfortunately, in the circumstance I am looking at the detail was adapted for the footing dowels in a landscape retaining wall.
RE: Rebar dowels driven into concrete
charliealphabravo, if they bars in flexure, they would be no good.
RE: Rebar dowels driven into concrete
RE: Rebar dowels driven into concrete
It's long been a standard detail in PCI's literature, and can still be found in precast supplier details, as well. Some (e.g. Spancrete, for instance) even publish test values for the shear than can be developed using this approach for lateral design.
It's not exactly the same as pounding in rebar, as the original query asks; but it is bars pounded into predrilled holes...
RE: Rebar dowels driven into concrete
Mike McCann, PE, SE (WA)