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).
Red Flag Submitted
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. The Eng-Tips staff will check this out and take appropriate action.
Reply To This Thread
Posting in the Eng-Tips forums is a member-only feature.
Metal can provide strength like no other material can and, throughout our history on Earth, humans have learned to harness metals for ever greater specialized applications, from radiation shielding on spacecraft to conductive components on circuits. Download Now