Etabs Mass Summary By Story _verified_

ETABS Mass Summary by Story

The is a crucial output used to verify the seismic weight and inertia of a structure. It provides a detailed breakdown of the mass and weight assigned to each level, which is essential for calculating base shear and checking for irregularities. Key Components of the Mass Summary Report

In a dynamic analysis, ETABS calculates the participation factors based on this mass. A critical check involves verifying that the modal participation mass ratios sum to near 100% ( etabs mass summary by story

Mass X and Mass Y

: The translational mass assigned to each story in the global X and Y directions, respectively. ETABS Mass Summary by Story The is a

Weight: This is the Total Mass converted back into force units (Weight = Mass × $g$). This is the number to check against your manual dead load take-offs.

Code base shear ($V = C_s \cdot W$) uses this $W$. If the Mass Summary shows incorrect $W$, the design base shear will be wrong, leading to unsafe or over-conservative designs. Weight: This is the Total Mass converted back

Click Display > Show Tables.
Expand the Structure Results tree.
Navigate to Mass > Mass Summary by Story.