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Large HSS Column Stiffeners

Large HSS Column Stiffeners

Large HSS Column Stiffeners

I have a custom HSS section that is approximately 5' x 10", it is being used to support large overhead doors.

My question is, the section needs to be stiffened at the top where the pulley assembly mounts to the column. How do I determine how far the stiffeners should run below the mounting bracket.

I'm worried about creating a point where the stiffness changes drastically and creates a "soft spot" in the column.
The load the stiffeners are holding is about 1/8 of the wind load (Which acts in the strong direction of the column and opposite to the dead load of the door).
So if the stiffeners run to far down the column I would have the same problem from the wind force which is much greater.

any input would be greatly appreciated.

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