It has come to our attention that the 2006 IBC now requires that you use only 2/3 of your dead load when calculating your overturning using ASD load combinations. Section 1605.3.2 states that "for load combinations that include the counteracting effects of dead and wind loads, only two thirds of the minimum dead load likely to be in place during a wind event shall be used". We do a lot of cement batch plants, with bins and silos on elevated legs - thus we can get some pretty high overturning forces. Since most of our stability is derived from the weight of the foundation, does this mean that our foundations will be 67% larger than they would have been if designed by the previous version of the IBC (2003)? What is everyone else's take on this, am I interpreting this correctly?
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