I was going to buy some 4x4 timber for veranda posts. However I have some steel posts 65x65x2mm.
I wonder how would one calculate what size steel post can be substituted for the timber post?
There are many variables with the steel supports 1) type of steel, 2) grade of steel, etc. and with the wood supports: 1) species, 2) grade, etc.
I’ll use A36 structural steel and SPF No.1 grade wood for comparison.
A 2 1/2” x 2 1/2” x 8’ high square structural tubing can support about 28 kips (28,000 lbs.) in axial (vertical) load.
A 4x4x8’ high wood post can support about 9 kips of axial load.
If you’re thinking of a different type of loading, please advise.