Torsionally Flexible Building in Eurocode 8: How to Set q - Factor & Check Modal Mass

Once your building is classified as torsionally flexible, you cannot proceed with a standard behavior factor ($q$). In this tutorial, we cover the exact next steps under Eurocode 8 (EN 1998-1) to adjust your design parameters, evaluate structural regularity, and interpret your modal analysis results. Hashtags #Eurocode8 #StructuralEngineering #SeismicDesign #BehaviorFactor #ModalAnalysis #ETABS #CivilEngineering #EN1998 #StructuralDynamics #EarthquakeEngineering