Total seismic base shear verification & manual weight checks.
For a given story, manually compute:
Name this mass source clearly, e.g., "ASCE7_Mass_Source" so reviewers know what you used. etabs mass summary by story better
The report provides a tabular breakdown of mass at each story level, derived from the Mass Source definition. Otte International : Found under Total seismic base shear verification & manual weight checks
: It reveals if elements meshed between stories are lumping mass to the wrong level. etabs mass summary by story better
Ensure you are checking the "Include Lateral Mass" option for seismic analysis.