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Heavy line loads on thin slabs on grade

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Has anyone here done an analysis of existing slabs on grade (4" thick, minimal WWR) to support high density filing systems? I've got a unit with a pair of 750plf loads about 7' o/c and reading ACI 360 has clouded the issue more than helping. Using the plain concrete formulas for shear in ch22 of ACI 318 and looking at the allowable subgrade bearing all look good (Vu/phi-Vn=0.4, q/q-all=0.35). If this were new construction I'd put a thickened slab in an skip the calcs and hand wringing, but the building is in service and we are trying to minimize the amount of "dirty" work in the area. Suggestions?

--
Jordan


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