Etabs Mass: Summary By Story

In structural engineering, accuracy is everything. When designing a building for lateral loads—such as wind or earthquakes—the accuracy of your analysis depends heavily on how well you define and verify the building’s mass.

In structural engineering, accurately determining a building's mass distribution is critical for seismic and lateral load analysis. ETABS, the industry-standard software for building analysis and design, provides a dedicated feature to evaluate this data: the table.

The specific level (e.g., "Story1," "Roof," "Terrace"). etabs mass summary by story

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Converting gravity loads (Dead Load, Super Dead Load) to mass. Tips for Accurate Mass Sources: In structural engineering, accuracy is everything

: The gravitational force associated with that story's mass. Critical Setup Requirements

When you run the analysis and navigate to , you will see a table with the following key columns: Share public link Converting gravity loads (Dead Load,

By comparing the mass distribution at different stories, you can detect if the mass is concentrated heavily on one side of the building, which would lead to high torsion ( RZcap R cap Z C. Consistency with Architectural Plans

Sometimes shown as UX Mass , UY Mass . This confirms the directional mass used for base shear calculation.

Before running response spectrum or time history analysis, check the (found in the Modal Analysis Tables). If your U1 and U2 participating mass ratios do not sum to at least 90% (per most codes), your building has insufficient modes captured.