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Re: Truck Design Loads

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Rich,

How big of a truck would you like to design for exactly? Highway bridges
designed to AASHTO are normally designed for an HS20-44 truck, the details
of which are below:

Front axle: 8 kips
Middle and back axle: 32 kip each
Front - middle axle dimension: 14'
Middle - back axle dimension: variable 14' to 30'
(Ref: AASHTO  16th edition, Allowable stress design, 1996, Section 3)

If you would like to design for an HS15, simply multiply all the loads by
15/20, or if you want to design for an HS25 multiply by 25/20.

Michael Ludvik, PE
Hardesty + Hanover
New York




                                                                           
             richard lewis                                                 
             <rlewistx(--nospam--at)juno.co                                             
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                                       seaint(--nospam--at)seaint.org                   
             07/12/2004 02:32                                           cc 
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                                       Truck Design Loads                  
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I am designing a floor framing above a service pit for automotive work.
Mostly the pt will be used for cars but the owner said he will
occasionally pull in big motor homes and tractor trailers.  Can somebody
give me the wheel or axle loadings for tractor trailers?  The owner said
to expect the trailers to be fully loaded.

Thanks.

Rich

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