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Re: Truck wheel loads?

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If my memory serves correctly an HS20 loading produces a 16,000 lb. wheel load.  Another loading that is applied is the Alternate loading of (2) 12,000 lb. wheel loads spaced at 4'-0" apart.  Some rough calculations using 10 yd concrete truck (40,500 lbs of concrete with 20,000 lbs of truck with 80% to rear duals) give wheel loads of 60,500*0.80*(1/2 to get loading on one side)*(1/2 to get load for each set of dual tires although some trucks have a single tire rather that duals on each axle) = 12,100 lbs which cpmapres pretty well with the alternate loading.  For a fire vehicle, the load would be similar except if they roll an earial ladder truck rather than an engine.  In that case they usually have outriggers used when they raise the aerial ladder for which the loading can be significantly more (think crane outriggers).  The local fire department can tell you what their trucks are rated at.
Bill Cain, S.E.
Berkeley CA
-----Original Message-----
From: Rhkratzse(--nospam--at)
To: seaint(--nospam--at)
Cc: rhkratzse(--nospam--at)
Sent: Tue, 27 Sep 2005 00:59:24 EDT
Subject: Truck wheel loads?

I'm designing a steel pile and timber or concrete lagging retaining wall for the downhill side of a driveway to a private residence yet to be built and want to consider vehicle surcharge.  The soil engineer recommends adding 150 psf of active soil pressure to the top 5' of the retaining wall for passenger cars only.  Traffic will obviously include concrete redi-mix trucks, garbage trucks, and possibly fire trucks, so I want to increase the surcharge by the ratio of the wheel loads.  But I don't know the wheel loads of such trucks.  Can anyone help me?

Thanks in advance.

Ralph Hueston Kratz
Structural Engineer

Fax 510-215-2430

724 McLaughlin Street
Richmond CA 94805-1402 USA