Etabs Mass Summary By Story

The ETABS Mass Summary by Story is a crucial output used to verify the seismic weight and inertia of a structure. It provides a detailed breakdown of the mass and weight assigned to each level, which is essential for calculating base shear and checking for irregularities. Key Components of the Mass Summary Report

• Dead Load (DL) = 500 kN per floor (including self-weight)
• Live Load (LL) = 200 kN per floor (reducible)
• Mass source: 100% DL + 50% LL = $500 + 0.5 \times 200 = 600 kN$ per floor (weight).
• Mass per floor = $600 / 9.81 = 61.16 \text N·s²/m$.

Decoding the ETABS Mass Summary by Story: A Guide for Structural Engineers

In the realm of structural engineering software, CSI ETABS (Extended Three-dimensional Analysis of Building Systems) stands as a cornerstone for the analysis and design of building systems. Among the myriad of output tables and log files it generates, one of the most critical—yet often overlooked—is the Mass Summary by Story. etabs mass summary by story

Scenario B: "The roof mass is zero."

Cause: You defined mass source from load patterns but forgot to assign any load pattern to the roof diaphragm. Or, you used a rigid diaphragm but the beams are not connected to the diaphragm constraint. The ETABS Mass Summary by Story is a