I've modeled my two simple-span girder-floorbeam-stringer bridge in two separate models, and my thru-girders in my Span 2 model are coming out with a much lower capacity than expected. They are coming out with rating factors around 0.1-0.4 for H15, HS20…

I am load rating (LFD) a ThruGirder-Floorbeam-Stringer bridge with open-grid steel deck. The deck is welded to the floorbeams and stringers only. There is no connection of the deck to the girders. The only load path for live load to get to the Thru-Girders…