Chris, I would suggest you take a look at ISO 1496-5. Containers IAW to this spec have a base support frame capable of supporting the load in two long zones and specified support spacing (sect 5.4).
D. Hanna
Does anyone recall the criteria for specifying shear strength? I have found in Machinery Hndbk where the shear strength for steel is 0.75*Su. I also have peers who swear by the criteria of 0.6*St. My old texts lean towards the 0.6*St for failure analysis, but I cannot get an additional...