Unfortunately, the design of bins and hoppers tends to get complicated for a number or reasons, and you're unlikely to find nice concise definitive answers like you'd want. There are a number of books that have been published on the topic, with a couple listed above. I believe there was a bin and hopper book by Gaylord & Gaylord as well. Their "structural engineering handbook" also has a chapter on the topic.
In silo design, you get hoop tension due to the pressure of the contents, and shell compression from friction of the contents. One design shortcut is overlooked in the references, though. IF your bin is fairly small, you can design for pressure as tho it was a fluid, and design for compression as though all the product were supported on the shell. These assumptions are conservative; if they make your shell too thick, you need to look at it in more detail.
One problem you have in bin design is that you often don't know the exact properties of the product, and then there is also a wide variation in the available pressure equations to choose from. So when you come up with design loads, be aware that they could vary significantly.
In the structural design handbook, Gaylord and Gaylord give a method of designing a tank supported by legs. If you look at their analysis of the circular beam, you'll notice they never deal with the torsion in the beam.