Mass Summary By Story - Etabs

Codes require that you accumulate 90% of the total building mass in the modes you consider for response spectrum analysis.

If ETABS reports total mass = 100,000 N·s²/m, then $W = 100,000 \times 9.81 = 981,000 N = 981 kN$. This must match the sum of dead load plus applicable live load per ASCE 7. etabs mass summary by story

To generate a Mass Summary by Story in ETABS: Codes require that you accumulate 90% of the