: Ensure that the Mass Source (e.g., self-weight, specified dead loads, and a percentage of live loads) is correctly calculated by the software.
: A brief comparison between ETABS results and a manual "check" of the total building weight to ensure no loads were missed or double-counted. How ETABS Lumps Mass
Follow these steps to extract and analyze the story mass data from your ETABS model: Step 1: Define the Mass Source Correctly etabs mass summary by story
Navigate to the window on the left side of the screen. Expand the Display tab. Expand Tables > Analysis Results > Structure Results . Double-click on Mass Summary by Story .
Discrepancies in the story mass often reveal modeling errors, such as duplicated elements, forgotten area loads, or incorrect unit assignments. Conclusion : Ensure that the Mass Source (e
is a critical output in ETABS used to verify the dynamic characteristics of a building. It provides a breakdown of the calculated mass—including self-weight, superimposed dead loads, and a percentage of live loads (as defined in the Mass Source)—assigned to each floor level. 1. The Role of the Mass Source The accuracy of the mass summary depends entirely on the Mass Source definition. Engineers typically include: Self-Weight and Specified Load Patterns:
) of the building is the sum of the masses across all stories multiplied by gravity ( Expand the Display tab
The mass used for dynamic analysis was derived from the following criteria: Element Self Mass: Additional Mass: [e.g., Cladding or Floor Finishes] Lumped Mass: