If the ground floor has more mass than the floor above, despite identical geometry, you likely assigned different load patterns. If a floor suddenly has zero mass, your diaphragm assignment is likely missing.
The ETABS Mass Summary by Story is not just a diagnostic tool—it is the foundation of your seismic safety. To make it better , you must: etabs mass summary by story better
The Mass Summary by Story report provides the following information: If the ground floor has more mass than
: The base level often includes half the mass of the lowest columns/walls. While this mass appears in the report and total reaction ( cap F sub z To make it better , you must: The
In structural engineering, the accuracy of a building’s dynamic analysis hinges on how mass is distributed and accounted for. While various methods exist for auditing mass, utilizing the feature in ETABS (Extended Three-Dimensional Analysis of Building Systems) stands out as the superior approach for ensuring model integrity, seismic compliance, and computational efficiency. Precision in Seismic Force Calculation
The following breakdown details how to access this data, why it matters, and how to optimize your modeling to ensure your mass summaries are as accurate as possible. 📥 How to Access the Mass Summary by Story in ETABS