Etabs Mass Summary By Story Extra Quality

If you check both "Element Self-Mass" in the Mass Source and add a Dead Load pattern that already includes a Self-Weight Multiplier of 1.0, ETABS will double-count the structural steel or concrete weight. This leads to an artificially heavy building and overly conservative (but incorrect) seismic forces. Ignoring Wall and Column Splitting

Suggests a strong base, but if lateral walls are not designed properly, this could lead to base shear issues.

The total mass of the building is the fundamental variable in the formula (Base Shear = Seismic Coefficient

The table typically displays the following values for each defined story: : The specific level of the building being reported. etabs mass summary by story

Checks the box to include the weight of beams, columns, and slabs based on material density.

[Your Name] Course: Structural Engineering / Computer-Aided Design Date: [Current Date]

) to find the total weight of the structure. Compare this value to the total dead load reaction in your base reaction tables ( Support Reactions ). They must match exactly. 6. Troubleshooting Common Issues If you check both "Element Self-Mass" in the

The "Base" or "Story1" (below ground) shows U1/U2 mass > 0. Problem: You applied floor loads to the foundation level, or the base slab is modeled as a flexible diaphragm. Fix: Delete loads at base or assign the base points to a fixed support with no mass source assignment.

Once the analysis is complete, you can access the tabular data: Display > Show Tables In the tree menu, navigate to: Analysis Results Structure Results Mass Summary Table: Mass Summary by Story to display the table. 3. Key Columns in the Table Mass Summary by Story table typically includes the following: : The name of each floor level.

The portion of the story mass that is assigned directly to rigid or semi-rigid diaphragms. The total mass of the building is the

Double-click on to open the data grid.

Let me know how you would like to proceed with your ETABS modeling! ETABS - CSI Knowledge Base