vertical/horizontal rebar interupted

[boffintech]

Condition: wall vertical/horizontal rebar is interrupted due to a round penetration.

Does ACI-318 have an absolute requirement for the placement of 1/2 the interrupted vertical/horizontal rebar on either side of a wall penetration?

This condition does not appear to be covered with a detail or a general note in the provided drawings. Can I assume the EOR has taken this penetration into account and designed the wall so that it does need additional rebar around the opening?



Thanks,
The Inspector

 

[msquared48]

It depends... I would add the cut rebar, plus add 45 degree bars if the opening was large enough.

How large is the opening and where is it in the height of the wall?

Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask

 

[csd72]

The professional thing to do would be to ask the EOR.

 

[JedClampett]

It is unlikely that ACI will prescribe additional bars as a requirement. If people were to check the stresses at an opening, it's likely that they wouldn't be needed all the time, especially in low stress areas of walls. But no one has that much time, to check every pipe opening in walls, considering that the people who design them don't know exactly where they are going to route the pipe.
So it's more efficient for a typical detail to be added and the bars put in every time than to engineer them away.
Is this some kind of financial issue? The bars shouldn't be that big of a deal.

 

[TXStructural]

For many openings, the ACI 117 tolerance of 3 inches in bar placement is sufficient. Simply move the bars aside. (i.e., for 6 inch spacing, a 12 inch opening can frequently be accommodated.)

Absent specific analysis and design, ACI 318 doesn't prescribe this. Convention and economy usually indicate that rebar, equivalent to the interrupted bars, be placed on the sides of openings. There would be limits for this, since excessively large holes would impair the function of some walls.

ACI 318 13.4 does specify that for slabs, interrupted bars can be placed on the sides of the opening, but the distribution isn't specified. I have not seen similar wording for walls.