Ensure you are checking the "Include Lateral Mass" option for seismic analysis.
To get a better Mass Summary, you must stop using the default DEAD load case. You need to create a custom . etabs mass summary by story better
Explore the CSI Knowledge Base for detailed FAQs on mass application. Mass Source Ensure you are checking the "Include Lateral Mass"
Which (e.g., ASCE 7-22, Eurocode 8, NBC) you are designing under? Explore the CSI Knowledge Base for detailed FAQs
Run Display > Show Mass Summary and toggle “Show as Table” . Then click “Export to Excel.” Plot story mass vs. height. Any anomalies will jump out visually.
Verify that all Live Load cases have been included in the Mass Source definition.
In this article, we will move beyond the default settings. We will explore how to extract, validate, and optimize the ETABS Mass Summary by Story to ensure your dynamic analysis (Response Spectrum, Time History) and modal results are physically accurate.