Bridge Design Software

[f8r]

I am currently using MDX Software (which handles LRFD) or SIMON (which does not handle LRFD). Each of these programs are adequate for line girder analyses, and MDX also does multi-girder grid analysis. However, I am looking for a Bridge Design Program that will handle a Stringer, Floor Beam, Main Girder model (i.e.- a 90' wide bridge with 5 Main Girders at 20' O.C.; Floor Beams at 28' O.C.; and a single wide flange Stringer spanning between Floor Beams midway between each Main Girder). I can design the Main Girders and Stringers individually as line girders and then hand-calc the Floor Beams, but for this Project, the client wants a grid analysis of the entire system. Are there any software programs that will handle this type of design model? RISA-3D has been suggested; has anyone used this program for a similar situation?

 

[Qshake]

Most, if not all, general finite element programs like STAAD, SAP2000, GTSTRUDL, Risa etc will do grid analysis. However, I suspect there must be some agreement on distribution from the slab to the grid system in order to produce any meaningful analysis. In other words, if you are looking at a vehicle load and the wheel line falls inbetween the grid what is the most appropriate way to distribute this to the intersections or members?

One step further on that last point would be to use a plate element on the grid but many questions also arise from this situation too.