Etabs Mass Summary By Story __exclusive__ Jun 2026

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

The global X and Y coordinates where the mass of that specific story is concentrated. etabs mass summary by story

Accidental double-modeling of slabs or beams. Note on RZ: represents the torsional mass moment of inertia

: Elements meshed between story levels might not have their mass lumped correctly to the nearest story. Accidental double-modeling of slabs or beams

A good engineering practice is to perform a quick hand calculation to verify the ETABS output. Even a rough "tributary area multiplied by average dead load" check can highlight massive modeling errors. Common Issues and Solutions

When you open the table, you will see several standard columns. Understanding exactly what each column represents is vital for proper data interpretation.

The translational mass active in the global X and Y directions. If you converted loads to mass uniformly, these values are typically identical.