Dear Sir,
Thank you for clarifying the advantages of using Rigid Diaphragm.
Request your feedback on the second part of my post - is there any way I can define the Mass Model Reference Load by referring to separately defined reference loads for DL and LL? Otherwise, I end up with the earlier problem of having to define the loads twice (one for the mass model and once for the primary load cases). This may seem insignificant in small projects. However, in large projects which undergo multiple changes in the design phase itself, it leads to likelihood of error due to inconsistency between dead/live loads defined and the seismic weight specification.
Thanks in advance
Arunkumar