I would be inclined to analyze the floor in question for the new load(s) to be
applied, regardless of prevailing building codes at the time of
design/construction. There's simply no way to tell if the building was built
right without checking it yourself.
Also, I'd be inclined to check the slab regardless of anything else. Sometimes
I feel comfortable making generalizations about beams, girders, and columns,
but slabs a very prone to failure under a concentrated load.
Don't shortcut this assignment. Most floor designs, even with grossly
conservative assumptions, should show the floor to be ok.
-Keith Fix, PE (CA & Arkansas)
--- "Mitchell J. Sklar" <MJS(--nospam--at)bala.com> wrote:
> What is the general rule or any published documents about checking an
> existing floor for new loads.
> Example new UPS or Battery Cabinet installed in an existing building.
> Assume original building live load design is 50psf + 20psf for
> partitions. Battery Cabinet footprint is 45" x 32", weight = 3765#
> Option 1 Gross load = 3765# / (45*32/144) = 376.5 psf (too much)
> Option 2 3765# / [(18+45+18)*(18+32+18)]/144 = 98.4 psf (better)
> How much area can I spread my new units out? 1 ft, 2ft?
> Okay, now here is the twist, the Battery Cabinet is supported by 8
> wheels @ 471#. How would you handle the concentrated stress?
> Mitchell J. Sklar, P.E.
> Structural Engineer
> Bala Consulting Engineers, Inc.
> p 610-649-8000 x 345
> f 610-649-8475
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