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Re: Live Load Distribution to Spandrel Girder

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I would treat the floor slab like a continuous beam (I assume it is a concrete slab) and solve for the reactions for a unit width of slab.  The reactions would be your tributary live load to the girder and purlins.  I've used this approach to determine girder reactions on pier caps for multi-lane bridges.

Kipp Martin, P. E.
Portland, Oregon