Etabs Mass Summary By Story Better Extra Quality Now

Compare this to the reported mass summary total. They must match within 1%. If not, your mass source is misapplied.

In your structural report, include:

definition. This summary table is the primary diagnostic tool to ensure the software is "seeing" the weight as intended. By comparing the story mass against manual hand-calculations or architectural estimates, engineers can verify that self-weight, superimposed dead loads, and the appropriate percentage of live loads are being correctly converted into inertial mass. 3. Streamlined Center of Mass (COM) Tracking etabs mass summary by story better

| Story | Mass (kip-s²/in) | Lateral Stiffness | |-------|------------------|-------------------| | Roof | 1250 | 280 | | 5 | 900 | 310 | | 4 | 900 | 310 | Compare this to the reported mass summary total

If you have a mechanical penthouse, the default summary lumps the penthouse floor mass into the roof story below it. This makes it look like your roof weighs 2x what it should. Better means decoupling these. In your structural report, include: definition

A junior engineer noticed the Mass Summary by Story showed only 1,200 kips of mass at the ground floor, while the architectural takeoff showed 1,800 kips.