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RE: SLAB ON GRADE: Truck Wheel Load

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Title: SLAB ON GRADE: Truck Wheel Load

I copied this from an email a few months ago on the list.  16 kips / (0.634’x1.67’) = 105 psi; reasonable for a large truck tire.  Hope this helps:




Truck wheel spacing / contact area:



Hey Bill, I didn't look at the sketch, but I would use a distributed load area from ASTM C857-95 "Minimum Structural Design Loading for Underground Precast Concrete Utility Structures".


DLA=(W+1.75H)*(L+1.75H) in square feet H is depth of fill, W is wheel contact width which is 0.634 ft, and L, the contact area length is 1.67 ft. This contact area is for ASHTO HS32 truck, 16 kip wheel loads.


2 trucks side by side would produce a pattern of 4 contact areas 6 ft apart, 4 ft apart, 6 ft apart.


On tandem axles, the contact areas are 4 ft apart with an wheel load of 12 kips.  It is a quick response, hope it helps.


Keith De Lapp, P.E.







-----Original Message-----
From: Polhemus, Bill [mailto:bill.polhemus(--nospam--at)]
Thursday, May 26, 2005 9:00 AM
To: seaint(--nospam--at)
Subject: RE: SLAB ON GRADE: Truck Wheel Load


From: Candi Anderson [mailto:canderson(--nospam--at)]
Thursday, May 26, 2005 8:30 AM
To: seaint(--nospam--at)
Subject: RE: SLAB ON GRADE: Truck Wheel Load


H-20 and HS-20 axle load is 32k. 

Tire contact area is a rectangle w/ length in direction of traffic = 10” and tire width = 20”.




Thanks, Candi.


I'm assuming that this would work out to Wheel Load = 32,000#/2 = 16,000#, and Tire Pressure = 16,000#/(10")(20") = 80 psi.


That's important because we're using a lesser load for grade slab design for "chicken trucks" based on typical weigh values, and I want to make sure I got the contact area correct.


Thanks once again.

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