Quote:
Originally Posted by 1990C4S
There are span and load charts online...and formulae...
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Yes, find and use those like a professional would.
Notice closely the "T" brackets at the top of the columns in the original post as well. These eliminate need for diagonal bracing.
At the bottom of the column will be equal measures as well.
These not only laterally stabilize the structure they work to transfer UPLIFT loads.
The roof acts like an airplane wing, hence the reason for tie-down straps and brackets in the building code.
Oshkosh Archives - Arizona Flight Training Workgroup
Precautions taken at the Oshkosh Airventure to tie aircraft down and ballast them may serve as a reminder.
Similarly your footings should be sized not only for gravity loads but for uplift as well.
If you pay a structural engineer for a couple hours of review time it will be well worth the $120 an hour in my opinion.