Etabs Mass Summary By Story !exclusive! May 2026

In ETABS, the Mass Summary by Story is a critical output table used to verify the total weight and mass distribution of a building for seismic and dynamic analysis. How to Access the Mass Summary Table To view the story mass data after running your analysis: Navigate to the Display menu. Select Show Tables.

The Mass Summary by Story report will display, showing the mass properties for each story in your building model.

The following table summarizes the mass distributed at each floor level. Mass X (kg) Mass Y (kg) Cum. Mass X (kg) Cum. Mass Y (kg) 4. Observations & Verification Mass Summary for ETABS Stories | PDF - Scribd etabs mass summary by story

4. Summation Row

ETABS provides a cumulative total from the top down. This is useful for checking overturning moments and total base shear.

Double Counting: Ensure you aren't selecting both "Element Self Mass" and a "Dead Load" pattern that already includes self-weight in your Mass Source. Mass FAQ - ETABS - CSI Knowledge Base In ETABS, the Mass Summary by Story is

Common Pitfalls and Fixes

| Pitfall | Consequence | Fix | | :--- | :--- | :--- | | Default Mass Source | Ignored live load and SDL; unconservative base shear | Define custom mass source (Dead + SDL + % Live) | | Duplicated Mass | Artificially high seismic forces | Check for overlapping shells or duplicate area loads | | Zero Rotational Mass | No torsional periods; inaccurate mode shapes | Assign diaphragm constraints to all floors | | Mass at Pinned Base | Building wants to lift off during analysis | Release base restraints or ignore (static only) |

In structural engineering, the Mass Summary by Story in ETABS is the definitive record of your building's weight. It is essential for calculating seismic forces and verifying that your model reflects the actual design. 🏗️ Why Mass Summary Matters Seismic Design: Directly influences the Base Shear ( The Mass Summary by Story report will display,

Mass X & Mass Y: These represent the total mass considered for horizontal motion in the X and Y directions. In most cases, these values are identical unless you have assigned specific directional mass properties.