Thanks for the responses --- we typically use oak timbers but they are trying to eliminate because of NFPA fire loading issues. I dont typically do alumimum design and obviously need to review the Al Design Manual. Thanks again...
We typically use 12 x 12" oak timbers as cribbing for heavy equipment maintenance. Typical point load weights = 20,000 lbs . Would like to use aluminum tube instead of the oak due to fire code/ fire loading issues.
Assuming 6" x 4" tube, trying to determine thickness required to support...