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RE: parking structure live load

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For a "typical" garage layout, a space is about 8 ft by 20 ft.  Using 
Paul's truck, that works out to be 55 psf.  So if you valet parked 
the BIG trucks end-to-end you arrive at a load generally consistent 
with the design live load.  However, almost all garages in the U.S. 
are self-parking.  With a very efficient layout on a large garage, a 
design might achieve 300 sf/stall including drive lanes, etc. 
(although 315 sf/stall is more typical).  Again using the BIG truck, 
the load is 8800/300=29.3 psf; 40% reduction of 50 psf (for suitable 
tributary area) looks pretty reasonable.

-Mike

> From:          Paul Meyer <PMeyer(--nospam--at)HASimons.com>
> Subject:       RE: parking structure live load
> Date:          Fri, 13 Aug 1999 16:32:52 -0700

> Imagine a 1998 Dodge Ram 3/4 ton truck (the coolest thing on the road BTW)
> Maximum weight 8800 lb. fully loaded.
> Length 18.66 feet
> Width (not including mirrors) 6.6 feet
> Assume 1.4 feet between each truck width, bumper to bumper lengthwise
> Load on floor is 59 psf.   
> That's a solid sea of very heavily loaded heavy-duty trucks.
> 
> 50 psf is fine for cars, light trucks and ambulances.
> 
> IF you have fire truck or semitrailer access, then you should start looking
> at bridge codes...

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Michael Valley                                   E-mail: mtv(--nospam--at)skilling.com
Skilling Ward Magnusson Barkshire Inc.                  Tel:(206)292-1200
1301 Fifth Ave, #3200,  Seattle  WA 98101-2699          Fax:        -1201