My first question: what is the weight bearing capacity of a 20m steel tube, 1/4" thick and 8" in diameter? I need to build a bridge that will support a 20t tanquero. I have steel tubes available to me, but I do not know the origin of the steel (probably Chinese, if that helps).
I am going to construct a house in coastal Ecuador and will be asking questions related to building infrastructure to support it. It will be a built on a 30% slope and I am seeking information related to construction materials.