Etabs Mass Summary By Story Better 〈2026 Edition〉

Dynamic lateral analysis requires an accurate Center of Mass (CM) and Center of Rigidity (CR) to calculate torsional effects. Inspecting individual nodes to find the balance point is impractical.

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.

What (e.g., ASCE 7, Eurocode 8) are you designing for? Are you using rigid or semi-rigid diaphragms?

A basic Python script can retrieve this table and immediately flag any discrepancies for you, such as comparing the sum of story masses against the Group ALL mass. etabs mass summary by story better

The "Mass Summary by Story" table presents values for the X, Y, and sometimes Z directions. These represent the used for seismic analysis.

Before running the analysis, ensure your mass source is correctly configured. Go to > Mass Source . Select your mass source and click Modify/Show Mass Source .

Note the global origin used for Center of Mass (CM) and Center of Rigidity (CR) calculations CSI Knowledge Base 2. Story Mass Summary Table Extract this table by navigating to Dynamic lateral analysis requires an accurate Center of

Mass Summary by Story is not the same as Mass Summary by Diaphragm ETABS 2016

I can provide tailored steps to extract and verify your specific seismic mass data. Share public link

View the combined mass of frames, shells, and links instantly. Then click “Export to Excel

Imagine you are not looking at a computer screen, but standing in a construction yard. You are the , and your job is to build a human pyramid for a famous circus act called "The Seismic Survivors."

Based on seismic codes like IS 1893:2016, you should typically define your mass source using a load combination of 1.0 * (Dead Load) + (Applicable % of Live Load). For the "From Loads" option, a common combination is 1.0 DL + 0.5 LL (for residential buildings) or 1.0 DL + 0.25 LL (for others). .

In your structural report, include:

: Roof levels where mechanical loads or parapet weights were forgotten. Step-by-Step: How to Access the Table in ETABS

Properly add Load Patterns (Dead Load, Superimposed Dead Load, Partition Load) with a multiplier of 1.0.