: Automatically calculated from material density and member volume. Additional Mass
). If your Mass Summary shows significantly lower values than your manual "take-off" calculations, your seismic base shear ( ) will be underestimated, leading to an unsafe design. 2. Identifying Modeling Errors
: The rotational mass around the center of mass. etabs mass summary by story
: The translational mass of the floor in the global X and Y directions.
After you verify the mass summary, run a modal analysis. The report depends entirely on the Mass Summary. : Automatically calculated from material density and member
Extracting this table is not just a bureaucratic step in documentation; it is a fundamental quality control and regulatory requirement. 1. Verification of Base Shear
The total translational mass of the story acting along the Global X and Global Y directions. These values are usually identical unless directional masses or asymmetric skin loads are applied. The coordinate locations After you verify the mass summary, run a modal analysis
In structural engineering, verifying a building's mass distribution is a critical quality control step. In ETABS, the table is the primary tool for validating structural weight, calculating seismic forces, and checking center of mass locations.
If your "Mass Source" (Define > Mass Source) is set to include "Element Self Mass" AND "Loads," but you’ve also manually assigned mass, you might be double-counting.