Etabs Modal Analysis Verified -

Click . Monitor the log for warnings (e.g., "Zero stiffness" indicates unstable model).

ETABS does use damping in eigenvalue extraction. Damping is applied later during response spectrum or time‑history analyses (e.g., 5% modal damping for seismic). To assign modal damping: Define > Materials > Damping or Define > Damping > Modal Damping . etabs modal analysis

After defining the modal case: