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Sorry to hijack but out of curiosity, if a pipe of that diameter is suitable, what about a square section? I ask because I have access to a 125mm square section with a wall thickness of 9mm, and a 150mm square section with 6mm thickness (Both are approx 1m high). I wanted to use these as the pier, and then weld it to a 300mmx300mm 16mm steel base plate.
I suppose the vertices of the RHS sections would have some stress concentration but I dont see why it would matter, given that the loads arn't exactly massive. Thoughts on this?
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