A general update in push over analysis should take place.
There are several issues that must be resolved in order this type of analysis to be completed in Robot. Some of these are already posted, for instance the following links:
http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Capacity-curve/td-p/3651586
http://forums.autodesk.com/t5/Autodesk-Robot-Structural/Frustrating-plastic-hinges/m-p/3649112/highl...
..and many others like the ability to set a starting case (usually containing dead and live loads) before the push over analysis e.t.c (I think that some of them are already posted as SR in Subscription Center).