Etabs Mass Summary By Story ((top)) Jun 2026

It acts as a diagnostic dashboard. A quick glance can reveal if you accidentally omitted a floor's dead load, double-counted a slab, or misconfigured your Mass Source settings. How to Access the Mass Summary Table in ETABS

is checked to account for translational mass in X and Y directions. 2. View the Mass Summary Table

). If your story mass is wrong, your calculated base shear, modal periods, and diaphragm forces will also be wrong. etabs mass summary by story

: Check if "Element Self Mass" is ticked in your Mass Source definition, or ensure your Dead Load pattern has a self-weight multiplier of 1.0. 2. Ux and Uy Values Do Not Match

In most standard buildings with symmetric floor layouts, UX and UY will be equal or very close. Differences between UX and UY may indicate mass irregularities, eccentricities, or that the mass source is not defined consistently. It acts as a diagnostic dashboard

In the Choose Tables window, expand the following directory tree: 📁 Analysis Results 📁 Structure Results 📄 Mass Summary by Story

Note on RZ: represents the torsional mass moment of inertia. This value dictates how the building twists during a seismic event and is critical for evaluating accidental eccentricity and torsional irregularities. Step-by-Step Mass Verification Workflow : Check if "Element Self Mass" is ticked

: The vertical mass component. While often excluded for standard lateral analysis, it is necessary for vertical seismic effects or special design requirements.

When reviewing the table, the most immediate metric is the vertical consistency of mass per story. A building follows the laws of physics; typically, lower stories have larger masses due to bigger column sections, thicker shear walls, and heavier floor plates, tapering off as the building rises.

When you view the table in ETABS, you will encounter the following key parameters: