Posted by johndeerefan on October 18, 2013 at 08:25:01 from (216.135.37.250):
In Reply to: Grain slab size posted by JEH on October 18, 2013 at 05:28:39:
Coming from an engineering perspective. I would pour 4 columns with footings under them (4 sonotube piers alone isn't enough without the footings). Then, if you want a slab, put expansion foam around the columns and pour an independent slab up against the piers. The expansion foam is very important to allow for expansion and contraction of the slab. Otherwise when it expands, it will crack somewhere.
In concrete slab design, if you have concentrated loads with 4 columns, a slab tends to be put in tension in the middle due to the bin weight being applied at the 4 corners. Concrete is very weak in tension, but high in compression. Supporting the load on 4 independent concrete piers releases the bin loads from the slab and the load is transferred directly to the piers and soil. We typically call the slab in this scenario a cleanup slab which can be 4" thick unless you plan to drive a truck on it.
As far as footing, pier, and slab sizing I couldn't make a recommendation due to several factors....Wind loads, seismic loads, loads to be put on slab, and most important soil conditions make each job site requirements different.
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