This pyramid represents your building. The "Mass Summary by Story" table is simply the medical chart for every person in that pyramid.
If you need help setting up the Mass Source for a specific code, let me know the code, and I can walk you through it.
This article serves as a comprehensive guide to effectively using ETABS's mass summary features. We will explore its theoretical underpinnings, practical applications in seismic design, common pitfalls and their solutions, and advanced techniques for data extraction and analysis.
The Mass Summary by Story table automates this entire process. It aggregates all structural components into a single, cohesive output per level. etabs mass summary by story better
: Include a check for Participating Mass Ratios (found under Analysis Results > Modal Results). Ensure that at least 90% of the mass is participating in the principal directions for seismic analysis. 4. How to Generate in ETABS
Once you've located the table, the next step is to understand the data it's reporting—which begins with how you've defined the building's mass.
A foolproof way to cross-check your "better" mass summary is to look at the from a static Load Case that includes the mass source loads with g = 386.4 in/s² . This pyramid represents your building
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.
table to ensure the applied un-decomposed loads match the calculated reactions. Common Pitfalls to Avoid
), which can cause catastrophic failures if not properly addressed. This article serves as a comprehensive guide to
In the context of seismic and dynamic analysis, mass is the fundamental property that governs a structure's inertial response. It is the quantity that resists motion, drives lateral forces, and determines a building's natural periods and mode shapes. ETABS, as a sophisticated structural analysis tool, provides detailed output tables for mass calculations, with the being one of the most critical reports for an engineer.
Mastering Seismic Analysis: Why ETABS Mass Summary by Story is Better for Structural Engineers