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Understanding Mass Summary by Story in ETABS In structural engineering, the Mass Summary by Story

Warning:

If you forget to define the mass source, ETABS uses the default (self-weight only). You will underestimate mass by 30–50%, leading to an unconservative design. etabs mass summary by story

If you are just getting started with these summaries, you can find introductory structural analysis tutorials on YouTube to walk through the basic table generation. Mass Source Understanding Mass Summary by Story in ETABS In

These properties are calculated based on the structural elements, such as beams, columns, walls, and slabs, that make up the building. such as beams

Incorrect Mass Source:

If your "Mass Source" (Define > Mass Source) is set to include "Element Self Mass" AND "Loads," but you’ve also manually assigned mass, you might be double-counting.