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Re: Heavy line loads on thin slabs on grade

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Anticipate a crack right down the center of each aisle.   Sorry no suggestions, unless they're willing to add a proper slab on top of, or in place of, the existing slab.  You get what you pay for.

Ralph

In a message dated 8/30/06 6:46:23 AM, seaint1(--nospam--at)truesdellengineering.com writes:
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?