: It helps identify if Superimposed Dead Loads (SDL) on null areas are failing to transfer to the seismic mass because a diaphragm wasn't assigned. How to Access the Report To get this better view of your structure’s data: Navigate to the Display menu. Select Show Tables . Go to Output > Other Output Items > Mass Summary by Story . Pro-Tip: The "Mass Source" Secret
Unlocking Precision: Why "Mass Summary by Story" is Better for ETABS Analysis etabs mass summary by story better
: Output values often require conversion; for example, dividing by 1,000 to match specific project units (e.g., from kg to Tonnes). Meshing Warning The Story: "The Sumo Pyramid" Null Areas :
Seismic forces are calculated based on mass. If your story mass is off, your base shear and lateral forces will be incorrect. This table allows you to: Verify the self-weight of slabs, beams, and columns. Go to Output > Other Output Items > Mass Summary by Story
A concise guide on generating and interpreting mass summaries by story in ETABS, useful for structural engineers performing seismic and dynamic analysis.