Bridge-dead load deflection. Please help!

[anamyslak]

Who could help me find the answer?
I'am dealing with bridge. I need to calculate dead load deflection for example at any given point (distance).
Given deflection in the middle of span.
Please see attached pdf.
Any help will be greatly appreciated.

[Norton_cad]

I spotted this add on for Revit structure which may help...
http://www.cscworld.com/revit/