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RE: Payloader Slab Design

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> Ed,
> 
One additional reference that might be of help:
Concrete Engineering Handbook, LaLonde & Janes, McGraw Hill, 1961, Chapter 9
Section "Concentrated Loads on Floor Slabs".  It is a good article and
includes the overlapping effect of multiple concentrated loads.

Regards,
Harold Sprague


> >>How would one appropriately design for heavy equipment loads on a
> concrete
> slab? 
> 
> We have a grain storage building with a 4' reclaim pit over which a
> reinforced
> concrete slab will span.  Is using AASHTO moment formulas (sections
> 3.24.3.1 &
> 2) and scaling for a 86 kip Payloader (with impact), appropriate?  It
> seems
> the Payloader wheel distribution would be significantly different from a
> HS 20
> truck.  Using 3.30, Tire Contact Area, assuming 40 kip on each wheel, A =
> .01*40,000lb = 400 in^2, which gives length = 31.6" and width = 12.7"
> which
> seems in the ballpark...
> 
> 
> Also, AASHTO 3.24.4, which states that shear would not need to be checked,
> seems to be a clearly inappropriate assumption to make in this particular
> situation.  But what would the assumed shear distribution be, 12.7"?
> 
> Thanks in advance for any help.<<
>