Etabs Mass Summary By Story Updated (2024)

| Observed Problem | Likely Cause | Solution | |----------------|--------------|----------| | Zero mass on a story | No assigned area/shell objects or missing mass source | Check Assign > Area Loads or revise mass source definition | | Asymmetric U1 vs U2 mass in symmetric building | Incorrect diaphragm assignment or accidental eccentricity | Verify rigid diaphragm assignments | | Unrealistically high mass | Duplicate loads or self-weight included twice | Review load patterns and mass source (exclude self-weight if already in dead load) | | Mass moment of inertia = 0 | No diaphragm or mass assigned | Assign a rigid diaphragm or specify rotational mass |

The standard report typically includes the following columns and data points: etabs mass summary by story

: Identifies each floor level defined in the model. | Observed Problem | Likely Cause | Solution