RE: SLAB ON GRADE: Truck Wheel Load[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: SLAB ON GRADE: Truck Wheel Load
- From: "Bruce Holcomb" <bholcomb(--nospam--at)brpae.com>
- Date: Thu, 26 May 2005 10:35:49 -0500
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.
From: Candi Anderson
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”.
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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