ACI 117 Tolerances
ACI 117 Tolerances
(OP)
My understanding is that ACI 117 allows for +/- 1" at slab edges in/out tolerance in plan (horizontal deviation). Is that correct? Is there any limit for floor to floor alignment/variation? The +/- 1" means that you could have +1" at one floor, -1" at the next. So building facade connections need to account for up to 2" variation in/out between floors if the tolerances are only limited to 117? It also allows +/-3/4" up/down in elevation - so this adds another 1-1/2" up down and that doesn't account for deflections. If the above is correct it seems that more stringent tolerances should be specified, or at least additional floor to floor variation limitations. Are 117 tolerances standard spec?






RE: ACI 117 Tolerances
This creates a plus and minus boundary on either side of a line of column going upward through the floors.
So you can't allow an accumulation of offsets (i.e. the second floor can't be 2" out of position - it also has to be within 1" of its original intended position).
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RE: ACI 117 Tolerances
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RE: ACI 117 Tolerances
RE: ACI 117 Tolerances
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RE: ACI 117 Tolerances
RE: ACI 117 Tolerances
RE: ACI 117 Tolerances
RE: ACI 117 Tolerances
Don't get me wrong - I haven't thought much on it to form a full opinion - just relaying what his point was.
Tolerance Traps link:
http://www.cibofnyc.org/documents/2010/TolerancesM...
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RE: ACI 117 Tolerances
ACI 117 reports the tolerances generated by other ACI committees (318, 301, 315, etc.), and may generate new tolerances where one is needed but hasn't been established. At the last ACI convention, I asked Committee 117 to determine and track "ownership" of tolerances. They are currently working on this and in short order should be able to verify where all tolerances in the document originated. Going forward, this will help with validation of tolerances and should avoid unresolved conflicts where multiple committees or standards have disparate values.
Where ACI 318 and 301 are in use, ACI 117 is the controlling tolerance document UNLESS other tolerances are specified in the contract documents. I hesitate to make different tolerances since the industry prices work based on the "state of the practice". When doing so, I recommend making the deviation clear so it can be priced and constructed according to your plans.
ACI 117.1R-14 Guide for Tolerance Compatibility in Concrete Construction provides information about what to do to prevent problems when one tolerance conflicts with another... for instance, concrete placement tolerances and in-service deflections that could interfere with wall systems.
From ACI 117-10:
4.1.1 For heights less than or equal to 83 ft 4 in.
For lines, surfaces, corners, and arrises: the lesser of
0.3% times the height above the top of foundations or
lowest support level as shown on Project Drawings
or ±1 in. This section shall not be used to evaluate local
departure from a specified plane or form irregularities.
Refer to Section 4.8.2 and 4.8.3, respectively.
For the outside corner of an exposed corner column
and grooves in exposed concrete: the lesser of 0.2%
times the height above the top of foundations or lowest
support level as shown on Project Drawings or ±1/2 in.
This section shall not be used to evaluate local departure
from a specified plane or form irregularities. Refer
to Section 4.8.2 and 4.8.3, respectively.
...
RE: ACI 117 Tolerances
RE: ACI 117 Tolerances
RE: ACI 117 Tolerances