By Story | Etabs Mass Summary

The is more than just a list of numbers; it is the "sanity check" for your building’s dynamic behavior. Before trusting your period of vibration or seismic drift results, always validate that the mass distribution matches your engineering intent.

When reviewing the table, the most immediate metric is the vertical consistency of mass per story. A building follows the laws of physics; typically, lower stories have larger masses due to bigger column sections, thicker shear walls, and heavier floor plates, tapering off as the building rises. etabs mass summary by story

In the realm of computational structural engineering, the "Mass Summary by Story" table is not merely a ledger of weights; it is the quantitative biography of the building. While ETABS provides a plethora of complex output displays—from moment diagrams to shell stress contours—the Mass Summary remains the fundamental diagnostic tool for verifying the physical integrity of the analytical model. It serves as the bridge between the architectural intent and the structural reality, translating volumetric geometry into the inertial forces that govern seismic response. The is more than just a list of

Loads like lateral wind or soil pressure are forces , not masses . The summary will only include loads that have a vertical component and are assigned to the mass source. Review your diaphragm assignments to ensure mass is correctly lumped at the center of rigidity. A building follows the laws of physics; typically,

The mass summary by story is a vital tool for structural engineers, as it helps them understand the distribution of mass within the building. This information is essential for several reasons: