: Total translational mass active in the X and Y directions.
ETABS, a popular structural analysis software, provides a powerful tool for engineers to analyze and design buildings. One of the essential features of ETABS is the ability to generate a mass summary by story, which is a crucial step in understanding the dynamic behavior of a building under various loads. In this article, we will delve into the concept of ETABS mass summary by story, its importance, and how to interpret the results.
Once you have successfully run your structural analysis, follow these steps to access the mass data: etabs mass summary by story
If a story has no diaphragm assigned, ETABS will still calculate the mass based on joint locations, but it will not display a single, unified Center of Mass coordinate for that story. Assign a rigid or semi-rigid diaphragm to resolve this. 3. Double Counting Loads
Engineers must define a via Define > Mass Source : : Total translational mass active in the X and Y directions
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ETABS Mass Summary by Story: The Definitive Guide to Verifying Building Mass In this article, we will delve into the
Weight). An error in the mass summary directly leads to an incorrect seismic force. Modal Analysis:
: Define this under Define > Mass Source . You must specify whether to use element self-mass, additional mass, or specific load patterns (like 100% Dead Load + 25% Live Load).
If you see a massive drop in weight from one story to the one below it, check for missing elements or incorrectly assigned material properties in the lower story.
If your ETABS mass summary does not align with your manual calculations, investigate these common culprits: Double-Counting Load Patterns