A quick glance at the cumulative mass helps verify if you are working in kips, tons, or kilograms. C. Calculating Eccentricity
Ensure you have assigned diaphragms to your floor shells. ETABS calculates story mass properties most effectively when floors are constrained as diaphragms. Mass Source: Most modern codes require Mass = StorageLiveLoadcap S t o r a g e cap L i v e cap L o a d
In ETABS, the is one of the most critical outputs for structural engineers. It provides a concise breakdown of how weight is distributed across the height of a building—a factor that directly dictates seismic forces and dynamic behavior. etabs mass summary by story
These represent the total mass considered for horizontal motion in the X and Y directions. In most cases, these values are identical unless you have assigned specific directional mass properties.
. Double-check that your Mass Source definition reflects your local code. A quick glance at the cumulative mass helps
Seismic codes (like ASCE 7 or Eurocode 8) calculate the base shear based on the total "Seismic Weight" (
The geometric coordinates where the story mass is concentrated. ETABS calculates story mass properties most effectively when
When you open the table, you will see several key headings. Understanding these is vital for an accurate peer review or design check: The specific level of the building.
If a story shows a mass significantly higher or lower than expected, it’s a red flag. Common culprits include:
