Moving Load, Precast Concrete Bridge

[yaroosh]

Hello Everyone,

I am running a moving load on precast concrete bridge. It is simply supported bridge, so I should have zero moments at the end. This is satisfied when I run my dead load. However, when I run my moving load, my response is different and there is moment near the end. I explored all possible scenarios, if anyone have a possible insight of why it is behaving this way, it will be greatly appreciated.

 

[STrctPono]

If you are integrating the moments across both the line element girder as well as the plate element deck, then it is understandable that you would have a small amount of moment at the ends for a moving load analysis as the adjacent deck elements that are not part of your effective girder section would add a small amount of restraint along the edges at the end and act as a boundary condition. But this should be small and not large. Based on your graph, it looks rather large. That's 11,200 k-ft of moment at the ends!!! Something is wrong as that number is way too high.