Rebar Detailing for Slab Opening
Rebar Detailing for Slab Opening
(OP)
Hi! I would like to know in what ACI is the Standard Rebar Arrangement around Slab Opening found? I placed 2 diameter 10 trimmer bars around openings, I just want to be sure if I am right. I can't find it in ACI Detailing 2004
Many thanks again.
Many thanks again.






RE: Rebar Detailing for Slab Opening
Can you add a sketch?
RE: Rebar Detailing for Slab Opening
what is the size of the hole and where?
RE: Rebar Detailing for Slab Opening
"Corner bars are opening bars placed on a diagonal at each corner. Although they aren't explicitly required, it's good practice to use them—they provide more efficient restraint of the likely cracks at the re-entrant corners."
RE: Rebar Detailing for Slab Opening
the opening.
RE: Rebar Detailing for Slab Opening
Also, there is ons set of bars that just dies at another transverse opening - the larger one. Since those bars cannot be extended toe 40 bar length, you need to either hook the bars or use a 90 degree bend for each bar.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Rebar Detailing for Slab Opening
Regarding lap, the bigger the opening, the longer the replacement bars need to be (but not necessarily the trim bars). Sometimes it makes more sense to run replacement bars the full length of the span (over beam or wall supports below). The replacement bars (bars to make up for being interrupted) must eventually transfer tension to the interrupted bars, or carry the full loads of the bay without trying to transfer tension to the "original" bars. Sometimes this is more than 40 bar diameters, depending on the separation distance between interrupted bars and replacement bars.
Rules of thumb are dangerous here, but at a minimum, much safer to go with 2 x standard lap splice length. Better to define strong bands in your slab to transfer shears and moments, and develop those bars as needed.
RE: Rebar Detailing for Slab Opening
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