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EAG: Steel Structure
Semi-Rigid beam-column (2 channels tied together) connection in column line.
In general, it is not advisable to count on perfect fixity in steel connections, save if undeformable stiffeners are provided.
The thickness and spacing of the transverse plates for the built-up column must be calculated.
As a reference, their thickness is in the order of 5/16 in., with a width of 6 in., and a spacing between 2 ft. and 3 ft.