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new beam on old slab

thread507-394102

new beam on old slab

new beam on old slab

(OP)
unique situation (to me). Have existing slab with footer around perimeter. Its a 12 think approx. 2 ft tall footer around perimeter with backfill and conventional slab inside. problem is new building going on it and building columns location will not be directly over footer and will rest on slab. Its only a open wall building with no load bearing qualities other than combined mass. Here is rub; advice is to create a new beam on top of slab and bridging footer to support and anchor building columns. New beam would be approx. 18" wide and approx. 6-9" thick, doweled into existing. I cant find anything supporting this idea or for that matter refuting it. Any input would be helpful.

RE: new beam on old slab

(OP)
Oh and thanks for reply.

RE: new beam on old slab

I think the success of that concept depends a lot on the density or compaction of the soil directly under the slab and adjacent to the grade beam.

The load from a column that is located more over the slab-on-grade would tend to rotate over and onto the slab. The slab will simply convey the pressure to the soils under it.

If the soils are loosely packed then there is the possibility that your new beam or curb would rotate with it causing problems above.

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