I know of a program called SAFE for analyzing and designing flat slabs, 2 way slabs, etc. This may be the program you are thinking of. It is by a company called Computers and Structures. It's possible to do the same analysis with either STAAD or RISA3D.
The usual maximum impact factor that may be achieved is 2, i.e., if you use 2 times the load for your design you will be on the safe side. Due to the spacing of the grill, it is obvious that the tiger will strike more than one. In additon, the grill will act as a two-way structure depending...