Etabs Mass Summary By Story Fix Access

In structural engineering, the Mass Summary by Story in ETABS is the definitive record of your building's weight. It is essential for calculating seismic forces and verifying that your model reflects the actual design. 🏗️ Why Mass Summary Matters Seismic Design: Directly influences the Base Shear (

The total mass of the building is the fundamental variable in the formula (Base Shear = Seismic Coefficient etabs mass summary by story

• Story 1 to 5: U1 Mass = 61.2 each.
• Total mass = $5 \times 61.2 = 306.0 \text N·s²/m$.
• Total seismic weight = $306.0 \times 9.81 = 3002 \text kN$.

3. UX, UY, UZ (Mass Moments of Inertia)

This is the rotational mass (polar moment of inertia) about each axis. In structural engineering, the Mass Summary by Story

Seismic codes (like ASCE 7 or Eurocode 8) calculate the base shear based on the total "Seismic Weight" ( Story 1 to 5: U1 Mass = 61