Etabs: Mass Summary By Story

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

It's common to want to verify the program's output with a hand calculation. To find the total of the building for gravity checks, you would not look at the "Mass Summary by Story". Instead, you should sum the base reactions from a Dead Load case or create an explicit load combination for weight [14†L16-L19]. The mass is a related but fundamentally different property.

By understanding where your mass comes from and how ETABS organizes it by story, you move from being a software operator to a true structural analyst. etabs mass summary by story

: Detect anomalies, such as a story having zero mass or an unusually high mass, which often indicates missing load assignments or incorrect material properties. Key Data Fields

A good engineering practice is to perform a quick hand calculation to verify the ETABS output. Even a rough "tributary area multiplied by average dead load" check can highlight massive modeling errors. Common Issues and Solutions The total mass of the building is the

: Using "Auto Mesh" on walls can sometimes lead to incorrect mass distribution. Manual meshing of shells and walls is often recommended to ensure all elements are properly connected and their masses correctly attributed to the nearest story.

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. The mass is a related but fundamentally different property

For most codes, set:

Seismic lateral forces are directly proportional to a structure's mass (

[ \textWeight = \textMass \times g ]