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AASHTO Load Cases

AASHTO Load Cases

AASHTO Load Cases

(OP)
Does anyone know what the standard governing load factors are for concrete bridge slabs designed with AASHTO LRFD?  I have read that it is 1.3DL + 2.17LL and I have also seen 1.25DL + 1.75LL listed.  And I have even seen 1.3DL + 1.3LL.  Which of these is the latest governing load case in the current AASHTO LRFD?  Again, this is for a check on a concrete bridge slab.

On another note, is the phi factor calculated as it is for regular LRFD for concrete (steel strain above 0.005, than phi = 0.9)?

RE: AASHTO Load Cases

THe first factored load equation appears to be from previous editions of AASHTO (1990s era).  It is the one I used when I was desinging bridges.  I believe the second equation may be the correct one in the LRFD specs.  I don't have a copy of the LRFD so I can't check that out.

Phi = 0.9 sounds correct.

Good Luck.

BTW, there is a bridge engineering forum here also.

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