Etabs Mass Summary By Story Better ((full)) Jun 2026

For response spectrum or time history analysis, the Mass Summary is your truth serum. Compute the from the modal analysis. The Mass Summary gives you the total mass of the building. The modal output gives you the effective modal mass.

The culprit?

ETABS calculates story mass based on:

The default ETABS Mass Summary is only as good as your assumptions. Many engineers open the table, see a number, and immediately proceed to design. This is a mistake. etabs mass summary by story better

: Briefly describe the structure, including the number of stories, heights, and general building type. For response spectrum or time history analysis, the