These represent the mass contributing to inertia in the global X (U1), Y (U2), and Z (U3) directions.
Multiply the total square footage of your building by an estimated average weight per square foot (e.g., 100–150 psf for concrete buildings, 50–80 psf for steel buildings). If the cumulative mass in ETABS differs from your hand calculation by more than 5% to 10%, re-examine your material properties and load assignments. etabs mass summary by story
A very specific topic!
This measures the mass distribution relative to the vertical axis. It is the governing factor for the building's torsional (rotational) response. Center of Mass (CM): These represent the mass contributing to inertia in
After running the analysis, you can access the data by following these steps: Go to the menu. Select Show Tables . Expand Structure Output . Expand Other Output Items . Check Mass Summary by Story . A very specific topic
If your Mass Summary by Story looks incorrect, check for these common modeling issues: 1. Missing Live Load Mass