Evaluating torsional eccentricities (Center of Mass vs. Center of Rigidity). Handling of Off-Diaphragm Mass Includes it flawlessly. Ignores it, leading to underreported building mass. Sensitivity to Meshing High; requires proper node alignment to lump correctly.
As a structural engineer, you know that the soul of a seismic analysis lies in how you define your building's mass. While ETABS offers various ways to view your model's weight, the report is often the gold standard for high-accuracy design.
) and ensures that the model’s total weight matches the design assumptions. Conclusion Mass Summary by Story etabs mass summary by story better
In your structural report, include:
If your modal analysis yields unexpected fundamental periods or strange mode shapes, the Mass Summary by Story table is your primary diagnostic tool. You can quickly scan the table vertically to check for: Evaluating torsional eccentricities (Center of Mass vs
The total combined mass of the current story plus all levels above it. Why Checking Mass is Critical 1. Validating Material Weights
Extracting the mass summary data in ETABS is a straightforward process. Follow these steps after running your structural analysis: Ignores it, leading to underreported building mass
Seismic lateral forces are directly proportional to a structure's mass (
Seismic design is a battle against torsion. The Mass Summary report typically includes the coordinates for the Center of Mass
If you are running an or a Dynamic Response Spectrum analysis.