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I am planning on building an above ground storm shelter that will be 16' x 16' by 8'. The footers will be 24" W by 12" D with 4-#4 rebar. Insulated Concrete Forms (ICFs) will be used for the walls then a 5" floor slab. Concrete space of the ICFs is 6.5" or 8" or 10" defending on someones response to my questions. The ceiling will be 6" Concrete reinfored with rebar and wire web. The walls will have rebar every 16" in both directions. Now the question. With a 16' x 8' cross section of wall, on normal level ground what wind speed would it take to topple the building for each wall thickness? I would guess you can leave out the affect of the ground holding down the slab/footings unless you can calculate that as well. I want to avoid having to dig down or pile dirt around this building if possible. My thought is that the weight of the building built with 6.5" concrete walls would be enough to provide safety up to 200 MPH but, I would like to know for sure. I want to thank you in advance for you help with this question
Ken
Ken