Long,
I agree with you. I was thinking about the same thing last night. If I have 12300 lbs of uplift and 2700 lbs of structure weight, 0.6D+W = 0.6*2700 – 12300 = 10680 lbs of uplift. I would then design the anchor bolts for this force. If I designed the footing to weigh 10680 lbs, my actual factor of safety would be (10680+2700)/12300 = 1.09, probably not necessarily the best idea. So I have decided I will just multiply the footing weight by 0.6 and have even larger footings. Although I am pretty sure I wont see the building rolling down the street in the next wind storm.
Jeff
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