Can I design concrete beams in STAAD.Pro as per the ACI code for minor axis moment My ?

STAAD.Pro always designs concrete beams for major axis moment MZ. However you follow the procedure listed next to get a reinforcement design corresponding to the minor axis moment.

You may apply a beta 90 to these beam members where you have significant minor axis moments. You would also have to reverse the YD and ZD values so that the geometry matches that of your actual structure. Subsequently you may analyze the model and design the beams. The software would still design for MZ However this design would actually correspond to the minor axis moment for this beam in your actual structure. Just ensure that if there are any loads in your model that were originally specified in terms of the local axes for these members, those are changed too. If the loads are specified with respect to the global axes, which is usually the case, you do not need to worry about changing any loads.