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RE: Payloader Slab Design

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Contact the equipment manufacture. They are usually willing to fax a data
sheet for the equipment that shows size, weight, and wheel load
distribution.

-----Original Message-----
From: Ed Fasula [mailto:tibbits2(--nospam--at)metro.lakes.com]
Sent: Monday, April 17, 2000 7:40 AM
To: seaint(--nospam--at)seaint.org
Subject: Payloader Slab Design


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.

Ed Fasula, E.I.T.