Currently, I Use Explicit Module for  dynamic  analysis in ABAQUS , If (for examaple  ) i suppose (5%) =>" ζ = Damping ratio = c / (2 m ωn )" damping ratio for concrete or (another material) and My model was SSI (Soil-Structure Interaction).So

 Is it true to define Damping ratio as Structural damping ?

structural damping=0.05? 

Thanks

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