I am working on a temporary bridge design. Although I have done LRFD designs in the past, this is the first with 2 design lanes loaded. Since the deck is steel grid, the Distribution factors are to be determined using the lever rule. I understand how to apply this rule to the exterior girders, but I am stumped for the interior girders. Can someone shed some light? Where do I assume hinges and take moments? (or am I on the wrong track already!) How do I apply the wheel loads of adjacent lanes (what distance between)? My beam spacing is 5'-0". My first guess resulted in a DF of 1.0 (essentially the interior beam is carrying half of both trucks).
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