warpage and tilt on column flanges

By Mikeqc1 (****)

Date 03-09-2010 22:00

oops wrong post

By rfieldbuilds (**)

Date 03-10-2010 12:25

AISC VOL XIII. LOOK up shapes and tolerances. Good Luck!

By jwright650 (*****)

Date 03-10-2010 13:00 Edited 03-10-2010 13:05

If you are trying to get the columns back to within mill tolerances, you will need to look at:
ASTM A6-06, page 29, Table 16. For Flange Tilt:

Dimension T and T subscript 1

ASTM A6-06, page 32, Table 24. For Camber and Sweep:

Take note of the formula to figure the tolerance vs the total length.
Be careful and make sure you apply the tolerance for W shapes to be used as columns.

depending on the length:

For lengths 45' and under: 1/8" x (number of feet of total length / 10) but not over 3/8"
For lengths over 45': 3/8" + [1/8" x ([number of total feet of length - 45] / 10)]

...........and there are foot notes to watch depending on the flange width or section weight

By waccobird (****)

Date 03-10-2010 13:06

Travis
AWS D1.1 Clause 5.23
5.23.1 Straightness of Columns and Trusses
Also just my ¢¢'s A Column made from a Beam has the same tolerances as far as fabrication consideration as if it was being made a Beam in the structure, but the ASMT A6M also will give you the tolerances expected for Structural Members'
Good Luck
Marshall

By eekpod

Date 03-10-2010 20:11

Basically your supposed to keep this from happening in the first place. We have had the very same situation and have ruined a few pieces in the past becasue the welder didn't pay attention to his heat input and totally destroyed the flanges.
Also something else to help with this situation is to put two doubler plates, one on each side to move the heat around. If engineering wise a 1" doubler plate will suffice on one side of the web, we may put two 1/2" plates one on each side to move the heat around easier. This is done in the approval stages and not once the drawings are approved and hit the shop floor.
Chris