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RE: axial braking load for bridges

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Breaking force is the greater of 25% of the design truck or tandem or 5% of the design truck plus lane load or 5% of the design tandem plus lane load per AASHTO LRFD 3rd Ed.  It is a longitudinal force (in the direction of traffic) acting at 6 feet above the bridge deck.
I hope this helps.

Chris Towne, P.E.
Chapman Technical Group
200 Sixth Avenue
St. Albans, WV 25177

-----Original Message-----
From: Haan, Scott M POA [mailto:Scott.M.Haan(--nospam--at)]
Sent: Tuesday, May 16, 2006 8:23 PM
To: seaint(--nospam--at)
Subject: axial braking load for bridges

I have a old structural engineering manual and I thought I read in there that it said that bridge foundations need to be designed for an axial breaking load equal to 25% or 30% of the live load neglecting impact.  Is this right?  Where is this located in the AASHTO Bridge Design Specifications.