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Precast multi-beam deck distribution factors

Precast multi-beam deck distribution factors

Precast multi-beam deck distribution factors

(OP)
BACKGROUND:
I am working on a bridge redesign project and it involves using precast prestressed solid flat slabs. The slabs have already been designed as part of a standard and are 4ft X 20ft. The standard is a two lane bridge with 6 slabs (24ft total width) and the new design will be three lanes with 8 slabs (32ft total width).

PROBLEM:
I am having some trouble with calculating the distribution factors for this type of bridge. I am familiar with DF's on typical slab and girder bridges, but this type is new to me. I have read and re-read the AASHTO section on this type of bridge (3.23.4, AASHTO Standard Specs. for Highway Bridge, 17th Ed. - Not LRFD), but it's still not 100% clear to me yet.

Any help or information in this matter would be greatly appreciated.

RE: Precast multi-beam deck distribution factors

Use paragraph 3.23.4.3, it's good for beams and slabs as well.

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