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Re: Live Load Distribution Factors

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You might consider referencing AASHTO's "Guide Specifications for Distribution
of Loads for Highway Bridges"
or  use simple beam distribution for a first number before going into a more
rigorous analysis.

Hope this helps,

Tom Cummings, PE
URS Greiner Woodward Clyde

"Pat Bachman" <BachmanPM(--nospam--at)> on 12/06/99 06:34:38 PM

Please respond to seaint(--nospam--at)

To:   seaint(--nospam--at)
cc:   "Scott Wallace" <WallaceSL.AustinPO.AustinGW(--nospam--at)>

Subject:  Live Load Distribution Factors

Greetings from the dry southwest! I am presently designing a bridge for some
unusual live loads as follows:

~ 80-ft wide bridge to carry two 160-ton coal haulers (Caterpillar 777D).
~ about 12-ft width between wheels.
~  two axles spaced at 15-ft.
~ 105-ft simple span
~ closely spaced prestressed concrete girders with composite slab.

AASHTO LRFD has distribution factors based on span length, beam stiffness, slab
thickness, and beam spacing, but these are developed for typical highway truck

Does anyone out there know a reference for distribution of live loads to the
beams? Thanks, Patrick Bachman, P.E.