Why ETABS "Mass Summary by Story" is Superior for Seismic Design
| Story | U1 (X) ton | U2 (Y) ton | U3 (Z) ton | | :--- | :--- | :--- | :--- | | Roof | 150 | 150 | 1000 | | 3rd Fl | 250 | 250 | 1200 | | 2nd Fl | 250 | 250 | 1200 | | Base | 200 | 200 | 1500 | etabs mass summary by story better
Lumped Mass Efficiency: ETABS can lump the mass of all nodes on a story to a "master node" at the center of mass. This simplifies the mass matrix and significantly reduces analysis time for high-rise buildings without sacrificing accuracy. Why ETABS "Mass Summary by Story" is Superior
Mass Distribution: Ensure that the mass is reasonably uniformly distributed across stories. Large discrepancies can lead to weak story problems. Total Weight (kip) = Sum of vertical reactions