Column Tolerances

[GPBeng]

I know AISC 303-10 in the steel manual sets certain tolerances for plumbness of columns, but I was curious, is there anywhere in the AISC code or other guidelines that give requirements for the rotation of a column off of the orthogonal direction that it was designed for?

 

[jayrod12]

I would think the connections would dictate that?

 

[GPBeng]

The connection was intended to just be a shear tab normal to the column, so I'm sure that there would be a connection that would work just fine even if the originally designed connection would no longer work due to the column orientation.

I didn't know if there was some limit we could point to that was some kind of industry standard for steel erectors.

 

[Hokie93]

Are the anchor rods in the correct location? Or is the column actually twisted? I don't believe AISC 303-10 provides an erection tolerance on twist/rotation. ASTM A6 may provide a fabrication tolerance for twist/tolerance.

 

[haynewp]

Is this a WF or HSS column?

 

[GPBeng]

This is a WF column.

 

[haynewp]

I found some references for allowable twist of HSS members but not WF.

 

[DETstru]

There are mill tolerances for WF columns being "out of square" (flanges not being perpendicular to the web). Though I don't think that's quite what you're asking.

The solutions center had an article about it a long time ago (found it here:

https://www.aisc.org/bookstore/itemRedirector.aspx?id=15906)

 

[BUGGAR]

I've always heard this is termed "manipulation" and is usually taken care of by the ironworkers. Doesn't work for HSS so they had to write code for that.

 

[GPBeng]

Thank you all for your input, and I should have mentioned earlier that this is not a matter of twist in the WF column but a matter of it being installed off of the orthogonal axes that it was designed to be oriented with.

 

[KootK]

As Hokie alluded, I'd have to think that the tolerance on the anchor bolt placements would be one "limit".

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.