Re: Using structural steel as a sleeve for MC
I agree with Bob. The strength in the column as far as I understand it is in the corners. Drilling a hole in the center does not weaken it considerably. There are people/books that know what you can do, consulting with them is wise.
I've seen 8" x 8" canopy columns at gas stations with 3.5" holes drilled (actually burned) at grade level and below grade level for drains for the canopy.
Lou (wannabe economist)
If you relentlessly pursue perfection, you will eventually catch excellence.