Go to Define > Story Data :
Users often find that the sum of story masses does not perfectly match base reactions. To get a "better" or more accurate summary, consider these factors: The "Half-Story" Rule etabs mass summary by story better
| Story | Mass DL | Mass 0.25LL | Total Mass | Seismic Weight (W) | Cumulative W | |-------|---------|-------------|------------|--------------------|---------------| | Roof | 850 | 50 | 900 | 8820 kN | 8820 kN | | PH | 300 | 10 | 310 | 3038 kN | 11858 kN | | 5 | 890 | 60 | 950 | 9310 kN | 21168 kN | Go to Define > Story Data : Users
: Briefly describe the structure, including the number of stories, heights, and general building type. definition
The culprit?
definition. To align with most seismic codes (like ASCE 7-16), ensure you include 100% of Dead Loads and a percentage of Live Loads (typically 25% for storage or specific occupancy). Unit Conversion