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RE: Water Storage Tank

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I would do a specific analysis for the concentrated loads.  The only rule of thumb I know of for uniform vs wheel loads is that a 300 psf uniform live load on a slab generally will accommodate an H20 truck load.  (Your 130 psf available live load is relatively low compared to that.)

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)


From: John Riley [mailto:jpriley485(--nospam--at)]
Sent: Monday, February 20, 2006 12:51 PM
To: seaint(--nospam--at)
Subject: Water Storage Tank

I've been asked to approve the use of asphalt paving equipment over an existing concrete water storage tank (flat slab without beams, with column capitals and drop panels).  Dimensions are uniform and symmetrical.  Using CRSI, I feel comfortable that the slab is design for about 130 psf superimposed load.

The contractor wants to use:

     Leeboy L8500T Paver      14,500#
     Bobcat 863 Skid Steer      6500#
     Cat 334 Paving Roller        8470#

Is there a customary way to translate the equipment loads into an equivalent uniform load?  I've done several simplified, bracketing type calculations, assuming one way action over a column strip, etcetera, but still don't have a cozy feeling about it yet.

John Riley

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