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AASHTO's R-value for bridge foundations

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I'd appreciate it if anyone could describe (or give me contact 
info for someone who can describe) the reasoning and  development of 
the design philosophy AASHTO's R = 1.0 for bridge foundations in SPC 
C and D in more detail than the AASHTO Commentary.  Also, 
would R=1 be applicable to batter pile design for dock and 
wharve foundations?

Thanks,

Dave Evans, P.E.
TNH, Inc.