Rebar Tolerances: out of straightness

[RFreund]

Is there a tolerance for rebar out of straightness (preferably an ACI reference)?
Can a straight rebar be "wavy" or "curved". If there is no published tolerance, is there reasonable limit or a way to evaluate this condition?

 

[bugbus]

In terms of how the bars are made/delivered? I don't think so. I found this:

https://www.concreteconstruction.net/how-to/tolerances-on-bar-straightness_o

In terms of placement, the corner bars need to remain in contact with the bends of the stirrups, so they really should not deviate much at all. If it were a middle bar in a beam, or a slab bar, I would not worry about some minor deviation.

Any sort of gentle curvature along the bar will be resolved by a similarly gentle transverse reaction from the concrete. As long as there is no major curve to how the bars are placed, I don't think there is any concern about needing to resolve the transverse forces, or splitting concerns, etc.

 

[structSU10]

I would think a bar that has sweep in it that cannot be pushed into a straight element may have been bent enough to yield and has permanent deformation. Will that cause an issue with the bar - I don't know.

ACI 117 covers tolerances but I do not see any for straightness of a bar - they only note length tolerances and other tolerances for bent bars.

 

[BridgeSmith]

Generally the bars should be held straight when they're tied to the transverse reinforcing (shear ties). I terms of capacity, the bending shown doesn't have a significant effect. The only problem I see would be a violation of the minimum clear space between the bars required for concrete to flow between them.

 

[RFreund]

In this case the bars are tied to transverse bars but the bars all wave. I'm trying to define "too big". I thought about using the following criteria:
1.) No Kinks
2.) Use tolerance for hot-rolled bars (ASTM A6) which is 1/4" in every 5' of length.

 

[BridgeSmith]

Unless they're really big bars, they should be able to be pulled straight when they tie them.

As far as what's too big, if it violates the minimum clearance between the bars, it's too much. Otherwise, it really doesn't matter.