elozio32,
I did leave the rebar out of the post. That's a very important part. When I pored the stem wall, I put a bunch of rebar and left enough out sticking out of concrete to weld to the shipping containers. In an attempt to test its strength, I used a 15 and 20 ton bottle jacks to break the first weld I made. The 15 ton did nothing. The 20 ton jack did break the container's metal and not my weld. There's now half inch rebar welded every ~6 feet.
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