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“HS-20” is a long-time standard loading defined in the AASHTO “Standard Specification for Highway Bridges.”

 

You will most likely want to design your bridge to AASHTO, just for defensibility’s sake (even though I’m assuming yours is not a “highway bridge”). There are lower-intensity loads defined in AASHTO, such as HS-15, H-15, etc.

 

Get a copy of the standard; it will explain the use of the loadings. Your fire-truck ought to fall within the parameters of a standard AASHTO loading.

 


From: Peggy Dall [mailto:pdall(--nospam--at)metwood.com]
Sent: Monday, September 20, 2004 10:27 AM
To: seaint(--nospam--at)seaint.org
Subject:

 

Does anyone know where H20 loading comes from and what it defines?  I'm working on a small bridge and we want to be sure that we're designing for the correct loads.  Also, is there a special spec for say, firetruck loads?  Thanks in advance.